Upper Limb — MCQs
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Which of the following structures is present in the posterior axillary wall?
Which of the following is NOT typically seen in carpal tunnel syndrome?
The pisiform bone articulates with which of the following carpal bones?
Klumpke's paralysis results from a lesion of which part of the brachial plexus?
When examining muscle function at the metacarpophalangeal (MP), proximal interphalangeal (PIP), and distal interphalangeal (DIP) joints, what findings do you expect in the presence of radial nerve palsy?
Which statement regarding the anatomical spaces of the hand is true?
A 22-year-old man presents to the emergency department after sustaining trauma. He reports severe pain radiating across his back and down his left upper limb. He is supporting his left upper limb with his right, holding it close to his body, and any attempt to move the limb exacerbates the pain. A radiograph reveals a sagittal fracture through the spine of the left scapula that extends superiorly toward the suprascapular notch. Which nerve is most likely affected?
A patient presented with inability to flex the distal interphalangeal joints of the fourth and fifth fingers and is unable to hold a card between his fingers. Fracture at which of the following sites might have damaged the nerve, leading to this set of clinical features?
Which structure is referred to as a "dynamic stabilizer" of the shoulder joint?
Pointing index deformity is due to damage to which nerve?
Upper Limb Indian Medical PG Practice Questions and MCQs
Question 61: Which of the following structures is present in the posterior axillary wall?
- A. Thoracodorsal artery
- B. Long thoracic nerve
- C. Subscapular artery (Correct Answer)
- D. Axillary artery
Explanation: ### Explanation The **axilla** is a pyramidal space between the upper limb and the thorax. Understanding its boundaries is high-yield for NEET-PG. **1. Why the Subscapular Artery is Correct:** The **posterior wall** of the axilla is formed by the Subscapularis (superiorly), Teres major, and Latissimus dorsi (inferiorly). The **Subscapular artery**, the largest branch of the third part of the axillary artery, descends along the lower border of the subscapularis muscle. Therefore, it lies directly on the posterior axillary wall before dividing into the circumflex scapular and thoracodorsal arteries. **2. Analysis of Incorrect Options:** * **Thoracodorsal artery (Option A):** While it is a branch of the subscapular artery, it typically enters the substance of the Latissimus dorsi [1]. In standard anatomical descriptions of the axillary walls, the parent **Subscapular artery** is the primary landmark associated with the posterior wall. * **Long thoracic nerve (Option B):** This nerve (C5-C7) descends on the external surface of the Serratus anterior muscle, which forms the **medial wall** of the axilla. * **Axillary artery (Option C):** The axillary artery and the cords of the brachial plexus are contained within the **axillary sheath**, which constitutes the **contents** of the axilla, rather than forming its walls. **3. Clinical Pearls & High-Yield Facts:** * **Medial Wall:** Serratus anterior and upper 4-5 ribs. * **Lateral Wall:** Bicipital groove of the humerus (very narrow). * **Anterior Wall:** Pectoralis major, Pectoralis minor, and Clavipectoral fascia. * **Nerve to Latissimus Dorsi (Thoracodorsal nerve):** Also lies on the posterior wall and is at risk during axillary lymph node dissection [1]. It crosses the axilla to reach the medial surface of the latissimus dorsi. * **Apex of Axilla:** Also known as the *cervico-axillary canal*, bounded by the clavicle, first rib, and upper border of the scapula.
Question 62: Which of the following is NOT typically seen in carpal tunnel syndrome?
- A. Median nerve compression
- B. Ulnar nerve involvement (Correct Answer)
- C. Flexor pollicis longus (FPL) tendon issues
- D. Flexor digitorum profundus (FDP) tendon issues
Explanation: **Explanation:** **Carpal Tunnel Syndrome (CTS)** is the most common entrapment neuropathy, caused by the compression of the **median nerve** as it passes through the carpal tunnel beneath the flexor retinaculum [2]. **1. Why Ulnar Nerve Involvement is the Correct Answer:** The ulnar nerve does **not** pass through the carpal tunnel. Instead, it travels superficial to the flexor retinaculum through **Guyon’s canal** (ulnar canal) [2]. Therefore, compression within the carpal tunnel typically spares the ulnar nerve. Clinical symptoms of CTS are localized to the median nerve distribution (lateral 3.5 fingers) [2]. **2. Analysis of Incorrect Options:** * **Median Nerve Compression (A):** This is the hallmark of CTS. The nerve is squeezed against the rigid walls of the tunnel, leading to paresthesia and thenar atrophy [1]. * **FPL (C) and FDP (D) Tendon Issues:** The carpal tunnel contains **10 structures**: the median nerve, the tendon of Flexor Pollicis Longus (1), the four tendons of Flexor Digitorum Superficialis (4), and the four tendons of Flexor Digitorum Profundus (4) [1]. Inflammation or tenosynovitis of these tendons is a primary cause of increased pressure within the tunnel, leading to nerve compression. **High-Yield Clinical Pearls for NEET-PG:** * **Sensory Sparing:** The **palmar cutaneous branch** of the median nerve arises proximal to the carpal tunnel; thus, sensation over the lateral palm is usually **preserved** in CTS [1], [2]. * **Tests:** Phalen’s test (forced flexion) and Tinel’s sign (percussion over the nerve) are classic diagnostic maneuvers. * **Muscle Involvement:** "LOAF" muscles (Lateral two lumbricals, Opponens pollicis, Abductor pollicis brevis, Flexor pollicis brevis) are affected. * **Most Common Cause:** Idiopathic; however, it is associated with pregnancy, hypothyroidism, diabetes, and rheumatoid arthritis.
Question 63: The pisiform bone articulates with which of the following carpal bones?
- A. Triquetral (Correct Answer)
- B. Lunate
- C. Scaphoid
- D. Trapezoid
Explanation: The **pisiform** is a small, pea-shaped sesamoid bone located in the proximal row of the carpus. It is unique because it is embedded within the tendon of the **flexor carpi ulnaris (FCU)** muscle. **1. Why Triquetral is correct:** The pisiform bone has only one articular facet, located on its posterior surface. This facet articulates exclusively with the **anterior (palmar) surface of the triquetral bone**, forming the pisotriquetral joint. Unlike other carpal bones, the pisiform does not participate in the radiocarpal (wrist) joint or the midcarpal joint. **2. Why other options are incorrect:** * **Lunate:** Located lateral to the triquetral in the proximal row; it articulates with the radius, scaphoid, triquetral, and capitate, but not the pisiform. * **Scaphoid:** The most lateral bone of the proximal row [1]; it articulates with the radius, lunate, trapezium, trapezoid, and capitate. * **Trapezoid:** A bone of the distal row; it articulates with the scaphoid, trapezium, capitate, and the second metacarpal. **High-Yield Clinical Pearls for NEET-PG:** * **Sesamoid Nature:** The pisiform is the only carpal bone that is a sesamoid bone (developed in the FCU tendon). * **Ossification:** It is the **last** carpal bone to ossify (usually between ages 9–12 years). * **Guyon’s Canal:** The pisiform forms the medial boundary of the ulnar canal (Guyon’s canal), making it a key landmark for identifying the ulnar nerve and artery at the wrist [1]. * **Palpation:** It is easily felt on the ulnar side of the distal wrist crease and moves slightly when the FCU is relaxed.
Question 64: Klumpke's paralysis results from a lesion of which part of the brachial plexus?
- A. Upper brachial plexus injury
- B. Lower brachial plexus injury (Correct Answer)
- C. Radial nerve injury
- D. C5, C6, and C7 nerve roots injury
Explanation: **Explanation:** **Klumpke’s Paralysis** is a clinical condition resulting from a lesion of the **lower trunk of the brachial plexus**, specifically involving the **C8 and T1 nerve roots**. 1. **Why Option B is Correct:** The lower brachial plexus (C8-T1) primarily supplies the intrinsic muscles of the hand (via the ulnar and median nerves). Injury typically occurs due to **hyperabduction of the arm** (e.g., clutching an object while falling from a height or a breech delivery). The hallmark clinical feature is **"Claw Hand"** (total clawing) due to the paralysis of lumbricals and interossei, which normally flex the MCP joints and extend the IP joints. 2. **Why Other Options are Incorrect:** * **Option A:** Upper brachial plexus injury (C5-C6) leads to **Erb’s Palsy**, characterized by the "Policeman’s tip" or "Waiter's tip" deformity. * **Option B:** Radial nerve injury typically results in **Wrist Drop**, not the global intrinsic muscle loss seen in Klumpke’s. * **Option D:** C5, C6, and C7 are associated with the upper and middle trunks. Klumpke’s specifically spares these and targets the lowermost roots. **High-Yield Clinical Pearls for NEET-PG:** * **Horner’s Syndrome:** Often associated with Klumpke’s paralysis because the **T1 root** carries sympathetic fibers to the face (presenting as miosis, ptosis, and anhidrosis). * **Mechanism of Injury:** Upward traction on the arm (Klumpke's) vs. Downward traction on the shoulder (Erb's). * **Muscle Involvement:** The most affected muscles are the **intrinsic muscles of the hand** and the long flexors of the fingers.
Question 65: When examining muscle function at the metacarpophalangeal (MP), proximal interphalangeal (PIP), and distal interphalangeal (DIP) joints, what findings do you expect in the presence of radial nerve palsy?
- A. Inability to abduct the digits at the MP joint
- B. Inability to adduct the digits at the MP joint
- C. Inability to extend the MP, PIP, and DIP joints (Correct Answer)
- D. Inability to extend the MP joint only
Explanation: ### Explanation **1. Why Option C is Correct:** The radial nerve (specifically its deep branch, the Posterior Interosseous Nerve) supplies all the muscles in the posterior compartment of the forearm [1]. These include the **Extensor Digitorum**, **Extensor Indicis**, and **Extensor Digiti Minimi**. These muscles are the primary extensors of the **Metacarpophalangeal (MP) joints** [1]. Furthermore, while the Lumbricals and Interossei (supplied by the Ulnar and Median nerves) contribute to extension at the **PIP and DIP joints** [2], the long extensors (Radial nerve) also provide significant tension and extension force to the entire extensor expansion. In a complete radial nerve palsy, the loss of the long extensors results in an inability to initiate or maintain full extension across all three joints (MP, PIP, and DIP) of the fingers, leading to the classic clinical presentation of **Wrist Drop** and **Finger Drop** [1]. **2. Why Other Options are Incorrect:** * **Options A & B:** Abduction and Adduction of the digits at the MP joints are functions of the **Dorsal and Palmar Interossei**, respectively. These muscles are innervated by the **Deep branch of the Ulnar Nerve**, not the radial nerve [1]. * **Option D:** This is a common distractor. While the radial nerve is the *sole* extensor of the MP joint, its paralysis also weakens the extension mechanism of the IP joints. Without the stabilization of the long extensors, the hand cannot achieve full functional extension of the digits. **3. Clinical Pearls for NEET-PG:** * **Wrist Drop:** Occurs due to paralysis of Extensor Carpi Radialis Longus/Brevis and Extensor Carpi Ulnaris [1]. * **Saturday Night Palsy:** Compression of the radial nerve in the spiral groove; presents with wrist drop but **spares the Triceps** (as the branch to the triceps arises higher in the axilla). * **PIN Palsy:** Injury to the Posterior Interosseous Nerve (at the Arcade of Frohse) causes finger drop but **spares wrist extension** (ECRL is supplied before the nerve enters the supinator). * **Rule of Thumb:** Radial nerve = Extension; Ulnar nerve = Intrinsic movements (Abduction/Adduction).
Question 66: Which statement regarding the anatomical spaces of the hand is true?
- A. The thenar space lies lateral to the 3rd metacarpal. (Correct Answer)
- B. The hypothenar space lies medial to the 5th metacarpal.
- C. The midpalmar space lies deep to the palmar aponeurosis.
- D. The pulp spaces lie on the palmar aspect of the fingers and thumb.
Explanation: **Explanation:** The deep fascial spaces of the palm are potential spaces filled with loose connective tissue, clinically significant for the localization and spread of infections [1]. **1. Why Option A is Correct:** The **thenar space** is a triangular space located deep to the thenar muscles. Its medial boundary is the **lateral palmar septum**, which is attached to the **3rd metacarpal bone**. Therefore, the thenar space lies lateral to the 3rd metacarpal, between it and the thenar eminence [1]. **2. Analysis of Incorrect Options:** * **Option B:** The **hypothenar space** is contained within the hypothenar compartment, bounded by the medial palmar septum (attached to the 5th metacarpal). It does not lie medial to the bone but rather surrounds the hypothenar muscles anterior/lateral to it. * **Option C:** While the **midpalmar space** is deep to the palmar aponeurosis, this is a vague description. Specifically, it lies deep to the **flexor tendons** and superficial to the interossei/metacarpals [1]. Option A is the more anatomically precise "textbook" definition regarding boundaries. * **Option D:** The **pulp spaces** (Whitman’s spaces) are located on the palmar aspect of the **distal phalanges** only, not the entire length of the fingers and thumb. They are partitioned by fibrous septa extending from the skin to the periosteum. **3. NEET-PG High-Yield Pearls:** * **Kanavel’s Signs:** Used to diagnose infectious tenosynovitis (e.g., symmetric swelling, finger in slight flexion, tenderness over sheath, pain on passive extension). * **Space of Parona:** A potential space in the distal forearm (deep to flexor tendons, superficial to pronator quadratus) where infections from the radial or ulnar bursae can track. * **Communication:** The midpalmar space often communicates with the forearm via the carpal tunnel.
Question 67: A 22-year-old man presents to the emergency department after sustaining trauma. He reports severe pain radiating across his back and down his left upper limb. He is supporting his left upper limb with his right, holding it close to his body, and any attempt to move the limb exacerbates the pain. A radiograph reveals a sagittal fracture through the spine of the left scapula that extends superiorly toward the suprascapular notch. Which nerve is most likely affected?
- A. Suprascapular nerve (Correct Answer)
- B. Thoracodorsal nerve
- C. Axillary nerve
- D. Subscapular nerve
Explanation: ### Explanation **Correct Option: A. Suprascapular nerve** The **suprascapular nerve** (C5, C6) originates from the superior trunk of the brachial plexus. It travels posteriorly toward the superior border of the scapula, passing through the **suprascapular notch** (beneath the superior transverse scapular ligament). In this clinical scenario, the fracture involves the spine of the scapula and extends toward the suprascapular notch. This anatomical location is a high-yield site for nerve entrapment or injury. Damage here results in: 1. **Motor loss:** Denervation of the **supraspinatus** (initiates abduction) and **infraspinatus** (lateral rotation). 2. **Sensory loss:** Deep pain in the posterior and lateral shoulder joint (the nerve provides articular branches to the glenohumeral and acromioclavicular joints). --- ### Why Other Options are Incorrect: * **B. Thoracodorsal nerve:** Arises from the posterior cord and supplies the latissimus dorsi. It runs along the posterior axillary wall, far from the scapular notch. * **C. Axillary nerve:** Passes through the quadrangular space, inferior to the glenohumeral joint. It is typically injured in surgical neck of humerus fractures or anterior shoulder dislocations, not scapular notch fractures. * **D. Subscapular nerve:** Arises from the posterior cord to supply the subscapularis and teres major. These nerves travel along the anterior surface of the scapula. --- ### NEET-PG High-Yield Pearls: * **The "Army over the Bridge, Navy under the Bridge" Mnemonic:** The Suprascapular **A**rtery passes **over** the superior transverse scapular ligament, while the Suprascapular **N**erve passes **under** it. * **Site of Injury:** A fracture at the **suprascapular notch** affects both supraspinatus and infraspinatus. However, a ganglion cyst at the **spinoglenoid notch** would only affect the infraspinatus. * **Clinical Presentation:** Patients often present with "dull aching" shoulder pain and wasting of the supra/infraspinatus fossae.
Question 68: A patient presented with inability to flex the distal interphalangeal joints of the fourth and fifth fingers and is unable to hold a card between his fingers. Fracture at which of the following sites might have damaged the nerve, leading to this set of clinical features?
- A. Scaphoid fracture
- B. Colles' fracture
- C. Bennett's fracture
- D. Hamate fracture (Correct Answer)
Explanation: ### Explanation The clinical presentation describes a lesion of the **Ulnar Nerve**. The symptoms are twofold: 1. **Motor Loss (DIP Joints):** The ulnar nerve supplies the medial half of the **Flexor Digitorum Profundus (FDP)**, which is responsible for flexing the distal interphalangeal (DIP) joints of the 4th and 5th fingers. 2. **Motor Loss (Interossei):** The "card test" assesses the **Palmar Interossei** (adduction). Inability to hold a card indicates weakness in these muscles, which are exclusively supplied by the deep branch of the ulnar nerve. **Why Hamate Fracture is Correct:** The ulnar nerve enters the hand through **Guyon’s canal**, which is bounded by the pisiform and the **hook of the hamate**. A fracture of the hook of the hamate is a classic cause of ulnar nerve injury at the wrist, leading to the loss of intrinsic hand muscle function and FDP impairment (if the lesion is proximal enough or involves the nerve trunk). **Analysis of Incorrect Options:** * **Scaphoid Fracture:** Most common carpal bone fracture; typically presents with pain in the anatomical snuffbox. It does not usually involve the ulnar nerve. * **Colles' Fracture:** A distal radius fracture with dorsal displacement ("dinner fork deformity"). It is more commonly associated with **Median nerve** injury (Acute Carpal Tunnel Syndrome). * **Bennett's Fracture:** An intra-articular fracture at the base of the first metacarpal. It affects thumb function but does not involve the ulnar nerve trunk or the 4th/5th fingers. **Clinical Pearls for NEET-PG:** * **Guyon’s Canal Syndrome:** Compression of the ulnar nerve at the wrist; common in long-distance cyclists ("Handlebar palsy"). * **Ulnar Paradox:** A lesion at the wrist (distal) causes a *more* prominent claw hand than a lesion at the elbow (proximal) because the FDP remains intact in distal lesions, increasing the flexion deformity. * **Froment’s Sign:** Used to test for ulnar nerve palsy (weakness of Adductor Pollicis).
Question 69: Which structure is referred to as a "dynamic stabilizer" of the shoulder joint?
- A. Rotator cuff (Correct Answer)
- B. Glenoid labrum
- C. Coracohumeral ligament
- D. Glenohumeral ligament
Explanation: **Explanation:** The shoulder (glenohumeral) joint is characterized by a high degree of mobility at the expense of stability, often compared to a "ball on a saucer." To maintain integrity, it relies on both static and dynamic stabilizers. **1. Why Rotator Cuff is Correct:** The **Rotator Cuff muscles** (Supraspinatus, Infraspinatus, Teres minor, and Subscapularis—mnemonic: **SITS**) are the primary **dynamic stabilizers**. They function by actively contracting to compress the humeral head into the shallow glenoid cavity throughout the range of motion. This mechanism, known as **"concavity-compression,"** prevents the humeral head from sliding out of the socket during movement. **2. Why Other Options are Incorrect:** * **Glenoid Labrum (B):** This is a fibrocartilaginous rim that deepens the glenoid cavity. It is a **static stabilizer**. * **Coracohumeral (C) and Glenohumeral Ligaments (D):** These are thickened parts of the joint capsule that provide stability only at the end-ranges of motion or when the muscles are relaxed. They are classified as **static stabilizers**. **3. NEET-PG High-Yield Pearls:** * **The "Fifth" Dynamic Stabilizer:** The **Long head of the Biceps brachii** is also considered a dynamic stabilizer as it prevents upward displacement of the humeral head. * **Weakest Point:** The rotator cuff is deficient **inferiorly**, which is why most shoulder dislocations occur in an antero-inferior direction. * **Rotator Interval:** A triangular space between the Supraspinatus and Subscapularis tendons; it is a common site for clinical pathology and surgical entry. * **Supraspinatus:** The most commonly injured rotator cuff muscle (often involved in impingement syndrome).
Question 70: Pointing index deformity is due to damage to which nerve?
- A. Ulnar
- B. Radial
- C. Median (Correct Answer)
- D. Axillary
Explanation: **Explanation:** The **Pointing Index Deformity** (also known as the **Ochsner’s Clench Sign**) occurs due to a lesion of the **Median Nerve**, typically at or above the elbow (e.g., supracondylar fracture of the humerus). **Why Median Nerve is correct:** When a patient with a high median nerve palsy attempts to make a fist, they are unable to flex the index and middle fingers. This happens because the median nerve supplies the **Flexor Digitorum Superficialis (FDS)** and the lateral half of the **Flexor Digitorum Profundus (FDP)** [1]. While the ring and little fingers can still flex (via the ulnar-supplied medial half of the FDP), the index finger remains straight/extended, resulting in a "pointing" appearance [1]. **Why other options are incorrect:** * **Ulnar Nerve:** Damage leads to "Ulnar Claw Hand" (hyperextension at MCP joints and flexion at IP joints of the ring and little fingers). It does not affect index finger flexion. Notably, the ulnar nerve innervates the FDP to the ring and small fingers [1]. * **Radial Nerve:** Damage leads to "Wrist Drop" due to paralysis of the extensors. Midshaft humeral fractures are commonly associated with this injury [1]. * **Axillary Nerve:** Damage leads to paralysis of the Deltoid and Teres Minor, resulting in loss of shoulder abduction and "Flat Shoulder" appearance. **Clinical Pearls for NEET-PG:** * **Hand of Benediction:** This is the same clinical presentation as Pointing Index, observed specifically when the patient **attempts to clench their fist**. * **Ape Thumb Deformity:** Also caused by Median nerve palsy, characterized by wasting of thenar muscles and inability to oppose the thumb. * **Kiloh-Nevin Syndrome:** Involvement of the **Anterior Interosseous Nerve** (branch of Median) where the patient cannot make an "OK" sign due to paralysis of Flexor Pollicis Longus and FDP to the index finger.
Practice by Chapter
Pectoral Region and Axilla
Practice Questions
Arm and Cubital Fossa
Practice Questions
Forearm and Hand
Practice Questions
Joints of Upper Limb
Practice Questions
Nerves of Upper Limb
Practice Questions
Arterial Supply and Venous Drainage
Practice Questions
Lymphatic Drainage
Practice Questions
Muscles and Their Actions
Practice Questions
Applied Anatomy and Clinical Correlations
Practice Questions
Surface Anatomy and Landmarks
Practice Questions
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