Upper Limb — MCQs

Which of the following statements regarding peripheral nerve injuries in the upper limb are true? 1. Radial nerve injury causes anesthesia over the anatomical snuff box. 2. Median nerve injury causes wrist drop. 3. Ulnar nerve injury causes a claw hand. 4. Index finger anesthesia is caused by median nerve injury. 5. Thumb anesthesia is caused by ulnar nerve injury.

Q568Easy

True regarding the beginning of the superficial palmar arch?

Q569Easy

Which bursa communicates with the shoulder joint space?

Q570Medium

Which of the following two muscles act together for climbing on a tree?

Upper Limb Indian Medical PG Practice Questions and MCQs

Question 561: Cubital tunnel syndrome occurs due to compression of which structure?

A. Median nerve
B. Radial nerve
C. Ulnar nerve (Correct Answer)
D. Branchial artery

Explanation: **Explanation:** **Cubital Tunnel Syndrome** is the second most common peripheral nerve compression syndrome (after Carpal Tunnel Syndrome). It occurs due to the compression of the **Ulnar nerve** as it passes through the cubital tunnel [1]. The cubital tunnel is an osteofascial canal located at the medial aspect of the elbow. Its boundaries are formed by the **medial epicondyle** of the humerus (anteriorly), the **olecranon process** of the ulna (laterally), and the **Osborne’s ligament** (arcuate ligament), which connects the two heads of the flexor carpi ulnaris (roof). Compression here leads to paresthesia in the small finger and the ulnar half of the ring finger, along with weakness of the intrinsic hand muscles [1]. **Analysis of Incorrect Options:** * **Median nerve:** Compression typically occurs at the wrist (Carpal Tunnel Syndrome) or in the forearm between the two heads of the pronator teres (Pronator Syndrome). * **Radial nerve:** Compression usually occurs in the spiral groove of the humerus (Saturday Night Palsy) or at the arcade of Frohse (Posterior Interosseous Nerve syndrome). * **Brachial artery:** While it passes through the cubital fossa, its compression or injury is associated with Supracondylar fractures of the humerus, leading to **Volkmann’s Ischemic Contracture**, not a tunnel syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Froment’s Sign:** Positive in Ulnar nerve palsy due to adductor pollicis paralysis (compensated by Flexor Pollicis Longus). * **Wartenberg’s Sign:** Inability to adduct the little finger. * **Tinel’s Sign:** Percussion over the cubital tunnel elicits "pins and needles" in the ulnar distribution. * **Motor Deficit:** "Claw hand" deformity (Ulnar Claw) is more pronounced in distal lesions (Ulnar Paradox).

Question 562: The lower lateral cutaneous nerve of the arm is a branch of which nerve?

A. Radial nerve (Correct Answer)
B. Axillary nerve
C. Median nerve
D. Musculocutaneous nerve

Explanation: The **Radial nerve** is the correct answer. It arises from the posterior cord of the brachial plexus (C5-T1) and provides extensive sensory innervation to the posterior and lateral aspects of the upper limb. In the arm, the radial nerve gives off three significant cutaneous branches: 1. **Posterior cutaneous nerve of the arm:** Arises in the axilla. 2. **Lower lateral cutaneous nerve of the arm (LLCNA):** Arises in the radial groove; it pierces the lateral head of the triceps to supply the skin over the lower lateral part of the arm. 3. **Posterior cutaneous nerve of the forearm:** Arises in the radial groove. **Analysis of Incorrect Options:** * **Axillary nerve:** It gives off the **Upper lateral cutaneous nerve of the arm** (which winds around the posterior border of the deltoid). This is a common point of confusion with the LLCNA. * **Median nerve:** It has no cutaneous branches in the arm; it primarily supplies the skin of the lateral palm and the lateral 3.5 fingers. * **Musculocutaneous nerve:** It continues as the **Lateral cutaneous nerve of the forearm** after piercing the deep fascia near the elbow. **High-Yield Clinical Pearls for NEET-PG:** * **The "Saturday Night Palsy":** Compression of the radial nerve in the spiral groove leads to "Wrist Drop," but sensation from the LLCNA may be preserved if the lesion is distal to its origin. * **Regimental Badge Area:** Sensation over the deltoid is mediated by the **Axillary nerve** (Upper lateral cutaneous nerve). Loss of sensation here is a classic sign of axillary nerve injury or shoulder dislocation. * **Rule of thumb:** If the nerve name contains "Posterior" or "Lower Lateral" (in the arm), think **Radial Nerve**.

Question 563: Which of the following muscles does not insert into the dorsal digital expansion of the ring finger?

A. Four dorsal interossei
B. Third palmar interossei (Correct Answer)
C. Four lumbricals
D. Extensor digitorum

Explanation: The **Dorsal Digital Expansion (DDE)**, or extensor expansion, is a specialized aponeurosis on the posterior aspect of the fingers that serves as a common insertion point for muscles that extend the interphalangeal joints. ### **Why Option B is Correct** The **Third Palmar Interossei** is the correct answer because it does not exist in the context of the ring finger. There are three palmar interossei (P-A-D: Palmar Adduct): * **1st:** Index finger (medial side) * **2nd:** Ring finger (lateral side) * **3rd:** Little finger (lateral side) The **middle finger has no palmar interossei** because it is the midline of the hand. Therefore, while a palmar interosseus *does* insert into the ring finger's DDE, it is the **2nd palmar interosseus**, not the 3rd. ### **Why Other Options are Incorrect** * **A. Four Dorsal Interossei:** These muscles (D-A-B: Dorsal Abduct) insert into the DDE and the base of the proximal phalanges. * **C. Four Lumbricals:** All four lumbricals insert exclusively into the lateral side of the DDE of the 2nd to 5th digits [1]. The **3rd lumbrical** supplies the ring finger. * **D. Extensor Digitorum:** This is the primary long extensor. Its tendons flatten out to form the central part of the DDE for the four medial fingers [2]. ### **High-Yield NEET-PG Pearls** * **Lumbricals:** "Workhorse" of the DDE; they flex the MCP joints and extend the IP joints (the "Z-position") [1]. * **Innervation:** 1st and 2nd lumbricals are Median nerve; all Interossei and 3rd/4th lumbricals are Ulnar nerve [1]. * **Clinical Sign:** Damage to these insertions leads to **Claw Hand** (hyperextension at MCP, flexion at IP joints).

Question 564: Struther's ligament is another name for which of the following?

A. Radial collateral ligament of the elbow joint
B. Ulnar collateral ligament of the elbow joint
C. Third head of brachialis
D. Third head of coracobrachialis (Correct Answer)

Explanation: **Explanation:** **Struther’s ligament** (also known as the ligament of Struthers) is a vestigial fibrous band that extends from an abnormal bony projection called the **supracondylar process** (located on the anteromedial aspect of the lower humerus) to the **medial epicondyle**. 1. **Why the correct answer is right:** Embryologically, Struther’s ligament is considered the **remnant of the third head of the coracobrachialis muscle**. In lower mammals, the coracobrachialis has three heads; in humans, the third head typically disappears, but when present, it persists as this fibrous band. 2. **Why the incorrect options are wrong:** * **Options A & B:** The radial and ulnar collateral ligaments are intrinsic stabilizing structures of the elbow joint capsule. They are anatomical constants and are not synonymous with vestigial muscular remnants. * **Option C:** The brachialis muscle typically has two heads (superficial and deep). While anatomical variations exist, it is not associated with the formation of Struther’s ligament. **Clinical Pearls for NEET-PG:** * **Median Nerve Entrapment:** The median nerve and the brachial artery pass beneath Struther’s ligament. Calcification or thickening of this ligament can lead to compression of the median nerve, mimicking Carpal Tunnel Syndrome but presenting with additional weakness of the forearm pronators (Supracondylar Process Syndrome). * **Location:** It is located approximately 5 cm proximal to the medial epicondyle. * **Differentiation:** Do not confuse this with the **Arcade of Struthers**, which is a thin aponeurotic band in the distal third of the arm that can compress the **ulnar nerve**.

Question 565: A cut injury of the ulnar nerve results in what clinical presentation?

A. Total claw hand
B. Paralysis of all lumbricals
C. Paralysis of all interossei (Correct Answer)
D. Paralysis of all slips of the flexor digitorum profundus

Explanation: The ulnar nerve is often referred to as the **"Musician’s Nerve"** because it controls the fine, intrinsic movements of the hand. ### **Explanation of the Correct Option** **C. Paralysis of all interossei:** The ulnar nerve (specifically the deep branch) supplies all **8 interossei** (4 dorsal and 4 palmar) [1]. These muscles are responsible for abduction (DAB) and adduction (PAD) of the fingers. Therefore, a complete ulnar nerve injury invariably leads to paralysis of all interossei, resulting in the inability to fan the fingers or grip a piece of paper between them (Positive Froment’s sign/Card test). ### **Why Other Options are Incorrect** * **A. Total claw hand:** Ulnar nerve injury causes **Ulnar Claw Hand** (affecting only the ring and little fingers). A "Total Claw Hand" involves both the ulnar and median nerves (e.g., Klumpke’s paralysis). * **B. Paralysis of all lumbricals:** The ulnar nerve supplies only the **medial two lumbricals** (3rd and 4th). The lateral two lumbricals (1st and 2nd) are supplied by the median nerve [1]. * **D. Paralysis of all slips of FDP:** The ulnar nerve supplies only the **medial half** (slips to the 4th and 5th digits) of the Flexor Digitorum Profundus [1]. The lateral half is supplied by the Anterior Interosseous branch of the median nerve. ### **High-Yield Clinical Pearls for NEET-PG** * **Ulnar Paradox:** A lesion at the **wrist** causes more prominent clawing than a lesion at the **elbow**. This is because, in elbow lesions, the medial half of the FDP is also paralyzed, reducing the flexion of the IP joints [1]. * **Froment’s Sign:** Tests for **Adductor Pollicis** (ulnar nerve) paralysis; the patient compensates by using Flexor Pollicis Longus (median nerve), causing flexion of the thumb IP joint [1]. * **Guyon’s Canal:** A common site for ulnar nerve compression at the wrist.

Question 566: The serratus anterior muscle is supplied by which nerve?

A. Thoracodorsal nerve
B. Axillary nerve
C. Musculocutaneous nerve
D. Long thoracic nerve (Correct Answer)

Explanation: **Explanation:** The **Serratus Anterior** muscle, often called the "boxer’s muscle," is primarily responsible for the protraction and rotation of the scapula. It is supplied by the **Long Thoracic Nerve** (also known as the Nerve of Bell). This nerve arises from the ventral rami of the **C5, C6, and C7** nerve roots. It is unique because it descends along the lateral wall of the thorax on the superficial surface of the muscle, making it vulnerable to injury. **Analysis of Incorrect Options:** * **Thoracodorsal nerve (C6-C8):** Supplies the Latissimus dorsi muscle [1]. Injury leads to weakness in extension, adducting, and internal rotation of the arm. * **Axillary nerve (C5-C6):** Supplies the Deltoid and Teres minor muscles. It also provides sensation over the "regimental badge" area of the shoulder. * **Musculocutaneous nerve (C5-C7):** Supplies the muscles of the anterior compartment of the arm (Biceps brachii, Coracobrachialis, and Brachialis). **Clinical Pearls for NEET-PG:** 1. **Winging of Scapula:** Damage to the long thoracic nerve (often during radical mastectomy or chest tube insertion) causes the medial border of the scapula to become prominent, especially when the patient pushes against a wall. 2. **Overhead Abduction:** The serratus anterior, along with the Trapezius, is essential for rotating the scapula upwards to allow abduction of the arm beyond 90 degrees. 3. **Mnemonic:** "C5, 6, 7 raise your arms to heaven" (referring to the nerve roots and the muscle's role in overhead abduction).

Question 567: Which of the following statements regarding peripheral nerve injuries in the upper limb are true? 1. Radial nerve injury causes anesthesia over the anatomical snuff box. 2. Median nerve injury causes wrist drop. 3. Ulnar nerve injury causes a claw hand. 4. Index finger anesthesia is caused by median nerve injury. 5. Thumb anesthesia is caused by ulnar nerve injury.

A. 1, 2, and 3 are true, while 4 and 5 are false.
B. 2, 3, and 4 are true, while 1 and 5 are false.
C. 1, 3, and 4 are true, while 2 and 5 are false. (Correct Answer)
D. 1 and 2 are false, while 3, 4, and 5 are true.

Explanation: This question tests your knowledge of the motor and sensory distribution of the major nerves of the upper limb. ### **Analysis of Statements** 1. **Radial Nerve (Statement 1):** The superficial branch of the radial nerve provides sensory innervation to the skin over the **anatomical snuffbox** and the lateral 2.5 digits on the dorsum of the hand [1]. Injury leads to anesthesia in this region. (**True**) 2. **Median Nerve (Statements 2 & 4):** The median nerve supplies the lateral 3.5 digits on the palmar aspect (including the **index finger**). Injury causes "Ape thumb" deformity and sensory loss over the index finger [1], [2]. **Wrist drop** is caused by Radial nerve injury [3], not Median. (**2: False; 4: True**) 3. **Ulnar Nerve (Statements 3 & 5):** The ulnar nerve supplies the intrinsic muscles of the hand (except LOAF) [2]. Injury leads to a **claw hand** (hyperextension at MCP joints and flexion at IP joints). It provides sensation to the medial 1.5 digits (little finger and medial half of ring finger) [1]; **thumb anesthesia** is related to the Median or Radial nerves. (**3: True; 5: False**) ### **High-Yield Clinical Pearls for NEET-PG** * **Radial Nerve:** "Saturday Night Palsy" or "Crutch Palsy" → **Wrist Drop** [3]. * **Median Nerve:** "Laborer’s Nerve." Injury at the wrist (Carpal Tunnel Syndrome) causes thenar atrophy. Pointing Index (Ape Hand) is characteristic. * **Ulnar Nerve:** "Musician’s Nerve." Injury at the elbow (Cubital Tunnel) or wrist (Guyon’s Canal) leads to the **Ulnar Paradox** (higher lesion = less obvious clawing). * **Sensory Testing:** The **tip of the index finger** is the autonomous zone for the Median nerve; the **tip of the little finger** for the Ulnar nerve; and the **first dorsal webspace** for the Radial nerve.

Question 568: True regarding the beginning of the superficial palmar arch?

A. At the level of the proximal transverse crease of the wrist
B. Below the distal transverse crease of the wrist (Correct Answer)
C. At the level of the proximal palmar crease
D. At the distal border of the thumb on the palmar surface

Explanation: The **Superficial Palmar Arch** is a vital arterial network in the hand, primarily formed by the direct continuation of the **ulnar artery**, often completed by the superficial palmar branch of the radial artery. **1. Why Option B is Correct:** The ulnar artery enters the palm superficial to the flexor retinaculum (through Guyon’s canal [1]). It begins to curve laterally to form the superficial palmar arch immediately after entering the hand. Anatomically, this "beginning" or entry point into the palm is located **distal (below) to the distal transverse crease of the wrist**. This landmark is crucial for surgeons to avoid accidental injury during carpal tunnel release or palmar incisions. **2. Analysis of Incorrect Options:** * **Option A:** The proximal transverse crease of the wrist corresponds to the level of the wrist joint (radiocarpal joint). The arch has not yet formed at this level. * **Option C:** The proximal palmar crease (the "life line" in palmistry) marks the **distal convexity** (the lowest point) of the superficial palmar arch, not its beginning. * **Option D:** The distal border of the thumb is too distal; the arch is already well-formed and giving off digital branches by this level. **3. Clinical Pearls for NEET-PG:** * **Surface Marking:** The convexity of the superficial palmar arch lies at the level of the **distal border of the fully extended thumb**. * **Deep Palmar Arch:** Formed mainly by the **radial artery**; it lies approximately **1 cm proximal** to the superficial arch. * **Allen’s Test:** Used clinically to assess the patency of the radial and ulnar arteries and the integrity of these palmar arches before arterial sampling. * **Relation to Nerves:** The superficial arch lies superficial to the digital branches of the median nerve [1].

Question 569: Which bursa communicates with the shoulder joint space?

A. Infraspinatous bursa
B. Subscapular bursa (Correct Answer)
C. Subcoracoid bursa
D. Subacromian bursa

Explanation: The shoulder joint (glenohumeral joint) is characterized by a lax capsule that features specific openings, allowing the synovial membrane to protrude and form bursae that communicate directly with the joint cavity [1]. **1. Why Subscapular Bursa is Correct:** The **subscapular bursa** lies between the tendon of the subscapularis muscle and the neck of the scapula. It communicates with the shoulder joint through an opening in the anterior part of the joint capsule, located between the superior and middle glenohumeral ligaments. This communication is a constant anatomical feature and serves to reduce friction for the subscapularis tendon during rotation. **2. Analysis of Incorrect Options:** * **Infraspinatous bursa:** Located between the infraspinatus tendon and the joint capsule. While it may occasionally communicate with the joint, it is not a constant or primary communication like the subscapular bursa. * **Subcoracoid bursa:** Situated below the coracoid process; it is typically a separate synovial sac and does not usually communicate with the joint space. * **Subacromial bursa:** This is the largest bursa of the shoulder, located between the acromion/coracoacromial ligament and the supraspinatus tendon. **Crucially, it does NOT communicate with the joint cavity** under normal physiological conditions. Communication here only occurs pathologically, such as in full-thickness rotator cuff tears. **High-Yield NEET-PG Pearls:** * **Two constant communications:** The shoulder joint cavity communicates with (1) the **subscapular bursa** and (2) the **synovial sheath surrounding the long head of the biceps brachii** (which is intracapsular but extrasynovial). * **Subacromial Bursa Clinical:** Inflammation here leads to "Subacromial Bursitis," causing a painful arc syndrome (60°–120° of abduction). * **Weakest point of the capsule:** The inferior aspect (axillary tail), as it is not supported by the rotator cuff muscles.

Question 570: Which of the following two muscles act together for climbing on a tree?

A. Latissimus dorsi & Serratus anterior
B. Serratus anterior & Teres major
C. Latissimus dorsi & Pectoralis major (Correct Answer)
D. Serratus anterior & Pectoralis major

Explanation: The act of climbing involves pulling the trunk upward toward a fixed upper limb. This movement requires powerful **adduction and extension** of the humerus at the shoulder joint. **1. Why the Correct Answer is Right:** * **Latissimus Dorsi:** Known as the "Climber’s Muscle," it is the most powerful extensor, adductor, and internal rotator of the humerus. [1] When the arms are fixed (e.g., holding a branch), it acts from its insertion to pull the trunk upward and forward. * **Pectoralis Major:** While primarily a flexor and adductor, its sternocostal fibers act as a powerful adductor and internal rotator. [1] Working in tandem with the Latissimus dorsi, it helps "hoist" the body weight during the upward phase of climbing. Both muscles insert into the bicipital groove (intertubercular sulcus) of the humerus, allowing them to exert massive leverage on the trunk. **2. Analysis of Incorrect Options:** * **Serratus Anterior (Options A, B, D):** This is the "Boxer’s Muscle." Its primary role is protraction of the scapula and rotation of the scapula for overhead abduction. It does not provide the downward pulling force required for climbing. * **Teres Major (Option B):** While it assists the Latissimus dorsi in adduction and internal rotation, it is a much smaller muscle and lacks the mechanical advantage of the Pectoralis major to lift the entire body weight. **High-Yield NEET-PG Pearls:** * **The "Lady between two Majors":** Latissimus dorsi (the Lady) inserts into the floor of the bicipital groove, while Pectoralis major and Teres major insert into the lateral and medial lips, respectively. * **Nerve Supply:** Latissimus dorsi is supplied by the **Thoracodorsal nerve** (C6-C8). [1] Injury to this nerve results in the inability to use a crutch or pull the body up during climbing. * **Serratus Anterior** is supplied by the **Long Thoracic Nerve** (C5-C7); injury leads to "Winged Scapula."

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Pectoral Region and Axilla

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Arm and Cubital Fossa

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Forearm and Hand

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Joints of Upper Limb

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Nerves of Upper Limb

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Arterial Supply and Venous Drainage

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Lymphatic Drainage

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Muscles and Their Actions

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Applied Anatomy and Clinical Correlations

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Surface Anatomy and Landmarks

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Upper Limb — MCQs

Upper Limb — MCQs

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