Upper Limb Practice Questions

Q: At the end of 1 year of age, what is the number of carpal bones typically visible on a skiagram of the hand?

Two. **Explanation:** The ossification of carpal bones follows a predictable chronological sequence, making them excellent indicators for assessing skeletal maturity (bone age) in pediatric patients. At birth, the carpal bones are entirely cartilaginous and therefore not visible on a radiograph (skiagram). **Why Option C is correct:** The carpal bones ossify in a clockwise or counter-clockwise direction starting from the **Capitate**, followed by the **Hamate**. * **Capitate:** Typically appears at **1–3 months**. * **Hamate:** Typically appears at **2–4 months**. By the end of the 1st year, these are the only two carpal bones that have usually undergone sufficient ossification to be visible on an X-ray. **Analysis of Incorrect Options:** * **A. None:** Incorrect, as the Capitate and Hamate ossify within the first few months of life. * **B. One:** Incorrect, as both the Capitate and Hamate are visible by 6 months of age. * **D. Three:** Incorrect, as the third bone (**Triquetral**) typically appears at **2–3 years** of age. **NEET-PG High-Yield Facts:** 1. **Sequence of Ossification:** Remember the mnemonic "**C**apitate, **H**amate, **T**riquetral, **L**unate, **S**caphoid, **T**rapezium, **T**rapezoid, **P**isiform" (roughly follows the age in years, except for the last few). 2. **Order of Appearance:** * 1 year: 2 bones (Capitate, Hamate) * 3 years: 3 bones (Triquetral) * 4 years: 4 bones (Lunate) * 5 years: 5-6 bones (Scaphoid, Trapezium, Trapezoid) * 12 years: 8 bones (Pisiform is the last to ossify). 3. **Clinical Pearl:** The **Capitate** is the first carpal bone to ossify, while the **Pisiform** (a sesamoid bone) is the last. Bone age is usually determined by an X-ray of the **left hand and wrist**.

Q: A patient diagnosed with leprosy with ulnar nerve involvement presents with clumsiness of hand. Clumsiness is due to palsy of which of the following muscles?

Interosseous muscle. The ulnar nerve is often referred to as the **"Musician’s Nerve"** because it controls the fine, coordinated movements of the fingers. The "clumsiness" of the hand in ulnar nerve palsy—common in leprosy—is primarily due to the paralysis of the **Interosseous muscles** (both dorsal and palmar). **Why Interossei are the cause:** The interossei are responsible for abduction (DAB) and adduction (PAD) of the fingers [1]. More importantly, they work with the lumbricals to perform the "Z-movement" (flexion at MCP joints and extension at IP joints). Loss of these muscles results in a loss of fine motor control, weakness in grip, and the inability to perform intricate tasks, leading to clinical clumsiness. **Analysis of Incorrect Options:** * **Extensor carpi ulnaris (A):** Supplied by the **Posterior Interosseous Nerve** (a branch of the Radial nerve). Its palsy leads to weak wrist extension and radial deviation, not finger clumsiness. * **Abductor pollicis brevis (B) & Opponens pollicis (C):** These are **Thenar muscles** supplied by the **Median nerve** [1]. Their involvement (e.g., in Carpal Tunnel Syndrome) leads to loss of thumb opposition and abduction ("Ape thumb deformity"), rather than generalized finger clumsiness. **High-Yield Clinical Pearls for NEET-PG:** * **Ulnar Paradox:** The higher the lesion (at the elbow), the less prominent the clawing, because the medial half of the Flexor Digitorum Profundus (FDP) is also paralyzed. * **Froment’s Sign:** Tests for Adductor Pollicis (ulnar nerve) palsy; the patient flexes the thumb IP joint (using the Median nerve's FPL) to grip paper. * **Wartenberg’s Sign:** Inability to adduct the little finger due to palmar interosseous weakness.

Q: The interosseous recurrent artery is a branch of which artery?

Posterior interosseous artery. **Explanation:** The **interosseous recurrent artery** is a key vessel involved in the arterial anastomosis around the elbow joint. It arises from the **posterior interosseous artery** (a branch of the common interosseous artery) near its origin. It ascends posteriorly to the lateral epicondyle of the humerus, where it anastomoses with the middle collateral artery (a branch of the profunda brachii). **Analysis of Options:** * **Posterior Interosseous Artery (Correct):** This artery passes backward between the radius and ulna. Its first major branch is the interosseous recurrent artery, which travels upward to participate in the elbow anastomosis. * **Anterior Interosseous Artery:** This artery travels down the anterior surface of the interosseous membrane. While it pierces the membrane to join the posterior compartment near the wrist, it does not give off the recurrent branch at the elbow. * **Common Interosseous Artery:** This is a short branch of the ulnar artery that divides into the anterior and posterior interosseous arteries. While it is the "parent" vessel, the recurrent branch specifically originates from the posterior division. * **Radial Artery:** The radial artery gives off the **radial recurrent artery**, which anastomoses with the radial collateral artery. It is distinct from the interosseous system. **High-Yield Facts for NEET-PG:** * **Elbow Anastomosis Rule:** Remember that "Recurrent" arteries (from below) meet "Collateral" arteries (from above). * **Middle Collateral Artery:** This is the specific partner for the interosseous recurrent artery. * **Common Interosseous Artery:** It is a branch of the **Ulnar Artery**, not the radial artery. * **Posterior Interosseous Nerve (PIN):** While the artery passes *above* the interosseous membrane, the PIN (deep branch of radial nerve) passes through the supinator muscle to enter the posterior compartment.

Q: Which of the following nerves does not have contributions from roots C5, C6, and C7?

Ulnar nerve. The Brachial Plexus is a high-yield topic for NEET-PG. To answer this question, one must understand the formation of the **Lateral Cord** and the **Medial Cord**. ### **Explanation of the Correct Answer** **D. Ulnar Nerve:** The ulnar nerve is the main branch of the **Medial Cord**. Its primary root values are **C8 and T1**. While it often receives a "communicating branch" from the lateral root of the median nerve (carrying C7 fibers) in about 50% of individuals, its classic anatomical description excludes C5 and C6. Therefore, it does not share the C5-C6-C7 distribution characteristic of the lateral cord branches. ### **Analysis of Incorrect Options** The Lateral Cord is formed by the union of the anterior divisions of the upper (C5, C6) and middle (C7) trunks. Consequently, all its branches typically carry **C5, C6, and C7** fibers: * **A. Lateral Pectoral Nerve:** A direct branch of the lateral cord (C5, C6, C7). It supplies the pectoralis major [1]. * **B. Musculocutaneous Nerve:** The terminal branch of the lateral cord (C5, C6, C7). It supplies the coracobrachialis, biceps brachii, and brachialis. * **C. Lateral Root of the Median Nerve:** One of the two heads forming the median nerve; it arises from the lateral cord and carries fibers from C5, C6, and C7. ### **High-Yield Clinical Pearls for NEET-PG** * **Mnemonic for Lateral Cord Branches:** "Lucy Loves Me" (Lateral pectoral, Lateral root of median nerve, Musculocutaneous). All are **C5-C7**. * **The "M" Shape:** The brachial plexus forms an 'M' over the axillary artery, consisting of the Musculocutaneous nerve, Median nerve, and Ulnar nerve. * **Ulnar Nerve Paradox:** Despite being C8-T1, the ulnar nerve is often described as having C7 fibers for the flexor carpi ulnaris; however, it never contains C5 or C6.

Q: Which of the following two muscles are crossed by the Extensor Carpi Radialis Longus?

Abductor Pollicis Longus and Extensor Pollicis Brevis. **Explanation:** The correct answer is **Option A: Abductor Pollicis Longus (APL) and Extensor Pollicis Brevis (EPB).** This question tests your knowledge of the **"Outcropping Muscles"** of the forearm and the anatomical arrangement of the extensor compartments. The Extensor Carpi Radialis Longus (ECRL) and Extensor Carpi Radialis Brevis (ECRB) originate from the lateral supracondylar ridge and epicondyle, respectively. As they descend toward the wrist to enter the second extensor compartment, they are superficially crossed by the tendons of the **APL and EPB** [1]. These two muscles "outcrop" from the deep plane of the posterior forearm to reach the thumb, passing obliquely over the radial extensors. **Analysis of Incorrect Options:** * **Option B & C:** The Extensor Indicis and Extensor Digitorum lie medial to or in a deeper plane relative to the path of the ECRL at the distal forearm; they do not cross over it [1]. * **Option D:** The Brachioradialis lies lateral to the ECRL, and the Extensor Digiti Minimi is located in the fifth compartment, far medial to the radial extensors [1]. **High-Yield NEET-PG Pearls:** 1. **De Quervain’s Tenosynovitis:** This clinical condition involves inflammation of the synovial sheaths of the APL and EPB (the first extensor compartment) [1]. 2. **Intersection Syndrome:** Pain and swelling at the site where the APL and EPB cross over the ECRL/ECRB (approximately 4cm proximal to the tubercle of Lister). 3. **Anatomical Snuffbox:** The APL and EPB form the lateral (anterior) boundary, while the Extensor Pollicis Longus (EPL) forms the medial (posterior) boundary [1]. The ECRL and ECRB tendons form the floor of the snuffbox.

Q: Ulnar paradox is seen in which of the following conditions?

High ulnar nerve palsy. The **Ulnar Paradox** refers to the clinical observation that a higher (more proximal) lesion of the ulnar nerve results in a **less severe** physical deformity (claw hand) than a lower (more distal) lesion. **1. Why High Ulnar Nerve Palsy is Correct:** In a **High Lesion** (at or above the elbow), the nerve supply to the **Flexor Digitorum Profundus (FDP)** of the ring and little fingers is lost. Since the FDP is responsible for flexing the Distal Interphalangeal (DIP) joints, its paralysis means the fingers remain relatively straight. This makes the "clawing" appearance less prominent, despite the injury being more proximal. **2. Why the Incorrect Options are Wrong:** * **Low Ulnar Nerve Palsy:** In a low lesion (at the wrist), the FDP remains intact while the lumbricals are paralyzed. The intact FDP continues to flex the DIP joints forcefully, while the unopposed extensors hyperextend the MCP joints. This results in a **more pronounced** and "ugly" claw hand. * **Combined Median and Ulnar Nerve Palsy:** This results in a "Total Claw Hand" involving all four fingers, but it does not define the specific "paradox" related to the level of ulnar nerve injury. * **Guyon’s Canal Entrapment:** This is a type of low ulnar nerve palsy. It would result in severe clawing, not the paradoxical reduction of deformity seen in high lesions. **Clinical Pearls for NEET-PG:** * **The Rule:** "The closer the lesion is to the paw, the worse the claw." * **Ulnar Claw Hand:** Characterized by hyperextension at MCP joints and flexion at IP joints (4th and 5th digits). * **Froment’s Sign:** Tests for adductor pollicis paralysis (ulnar nerve); the patient compensates by flexing the thumb IP joint using the Flexor Pollicis Longus (median nerve).

Q: Which of the following is not a component of the carpal tunnel?

Ulnar nerve. The **carpal tunnel** is a fibro-osseous gateway located at the wrist, formed by the carpal bones (arch) and the **flexor retinaculum** (roof). Understanding its contents is high-yield for NEET-PG. [1] ### Why the Ulnar Nerve is the Correct Answer The **ulnar nerve** (and the ulnar artery) does **not** pass through the carpal tunnel. Instead, it travels superficial to the flexor retinaculum through a separate anatomical space known as **Guyon’s canal** (ulnar canal). [1] Therefore, it is not affected by carpal tunnel syndrome. ### Analysis of Other Options (Contents of the Tunnel) The carpal tunnel contains exactly **10 structures**: * **Median Nerve (Option B):** The most superficial and clinically significant structure in the tunnel. [1] Compression of this nerve leads to Carpal Tunnel Syndrome (CTS). * **Flexor Digitorum Superficialis (Option C):** Four tendons of the FDS pass through the tunnel, arranged in two layers (middle and ring finger tendons are superficial to index and little finger tendons). * **Flexor Digitorum Profundus (Option D):** Four tendons of the FDP pass through the tunnel deep to the FDS. [2] * **Flexor Pollicis Longus:** One single tendon (the 10th structure) passes through its own synovial sheath on the radial side. [2] ### High-Yield Clinical Pearls for NEET-PG * **Guyon’s Canal:** Formed by the pisiform and the hook of the hamate. Compression here affects the ulnar nerve (Claw hand). * **Flexor Carpi Radialis (FCR):** Often a "trap" option; it travels in its own separate compartment within the lateral attachment of the flexor retinaculum and is technically **not** inside the carpal tunnel. [3] * **CTS Symptoms:** Characterized by paresthesia in the lateral 3.5 digits and wasting of the **Thenar muscles** (LOAF muscles), but the **palmar cutaneous branch** of the median nerve is spared as it passes superficial to the retinaculum. [1], [2]

Q: A 43-year-old man had a previous injury to his wrist involving the ulnar nerve. Which of the following clinical signs would indicate nerve severance?

Claw hand involving the ring and little fingers. The ulnar nerve is often referred to as the **"Musician’s Nerve"** because it controls the fine movements of the fingers. It supplies the **medial two lumbricals** (ring and little fingers) and all the **interossei** muscles [2]. **Why Option A is correct:** The lumbricals normally function to flex the metacarpophalangeal (MCP) joints and extend the interphalangeal (IP) joints. When the ulnar nerve is severed at the wrist, the medial two lumbricals are paralyzed. This leads to an unopposed action of the finger extensors (at the MCP joint) and finger flexors (at the IP joints), resulting in the characteristic **"Ulnar Claw Hand"** (hyperextension at MCP and flexion at IP joints) specifically involving the **ring and little fingers** [2]. **Why the other options are incorrect:** * **Option B:** Clawing of the index and middle fingers occurs with **Median nerve** injury, as it supplies the lateral two lumbricals [1]. * **Option C:** Atrophy of the thenar eminence is a classic sign of **Median nerve** injury (e.g., Carpal Tunnel Syndrome). The ulnar nerve supplies the hypothenar muscles [2]. * **Option D:** Sensation to the index finger is provided by the **Median nerve** [1]. Ulnar nerve injury results in sensory loss over the medial 1.5 fingers (little finger and medial half of the ring finger). **NEET-PG High-Yield Pearls:** 1. **Ulnar Paradox:** A lesion at the **wrist** causes a *more prominent* clawing than a lesion at the elbow. This is because, in high lesions, the Flexor Digitorum Profundus (FDP) is also paralyzed, reducing the flexion at the IP joints. 2. **Froment’s Sign:** Used to test for ulnar nerve palsy; it assesses the paralysis of the **Adductor Pollicis** muscle [2]. 3. **First Dorsal Interosseous:** The best muscle to test clinically for ulnar nerve integrity (abduction of the index finger).

Q: Neurological testing of a patient reveals no cutaneous sensation on the tip of the index finger. Such a finding would indicate injury to some portion of which nerve?

Median. ### Explanation **Correct Option: B. Median Nerve** The cutaneous innervation of the hand is a high-yield topic in anatomy. The **Median nerve** provides sensory innervation to the palmar aspect of the lateral three and a half digits (thumb, index, middle, and radial half of the ring finger) and their respective nail beds on the dorsum [1]. The **tip of the index finger** is a "pure" or autonomous sensory zone for the Median nerve, meaning there is minimal overlap from other nerves [1]. Therefore, a loss of sensation specifically at this site is a classic clinical indicator of Median nerve injury (e.g., Carpal Tunnel Syndrome or injury at the elbow). **Why Incorrect Options are Wrong:** * **A. Axillary Nerve:** Supplies the "regimental badge" area over the lower half of the deltoid muscle. It does not extend to the hand. * **C. Musculocutaneous Nerve:** Continues as the Lateral Cutaneous Nerve of the Forearm. It supplies the skin on the radial (lateral) side of the forearm up to the wrist but does not supply the fingers. * **D. Radial Nerve:** Supplies the skin on the dorsum of the hand (lateral three and a half digits), but crucially **excludes the fingertips/nail beds**, which are supplied by the Median nerve. Its autonomous zone is the first dorsal web space. **Clinical Pearls for NEET-PG:** * **Autonomous Zones:** * **Median Nerve:** Tip of the index finger. * **Ulnar Nerve:** Tip of the little finger. * **Radial Nerve:** Dorsal web space between the thumb and index finger. * **Motor Deficit:** Median nerve injury at the wrist (Low Median Nerve Palsy) leads to "Ape Thumb" deformity due to paralysis of the thenar muscles. * **Point to Remember:** The palmar cutaneous branch of the median nerve arises *proximal* to the carpal tunnel; thus, sensation over the **thenar eminence** is preserved in Carpal Tunnel Syndrome [1].

Question 1

At the end of 1 year of age, what is the number of carpal bones typically visible on a skiagram of the hand?

Accepted Answer

Two

Answer

None

Answer

One

Answer

Three

Question 2

A patient diagnosed with leprosy with ulnar nerve involvement presents with clumsiness of hand. Clumsiness is due to palsy of which of the following muscles?

Accepted Answer

Interosseous muscle

Answer

Extensor carpi ulnaris

Answer

Abductor pollicis brevis

Answer

Opponens pollicis

Question 3

The interosseous recurrent artery is a branch of which artery?

Accepted Answer

Posterior interosseous artery

Answer

Anterior interosseous artery

Answer

Common interosseous artery

Answer

Radial artery

Question 4

Which of the following nerves does not have contributions from roots C5, C6, and C7?

Accepted Answer

Ulnar nerve

Answer

Lateral pectoral nerve

Answer

Musculocutaneous nerve

Answer

Lateral root of the median nerve

Question 5

Which of the following two muscles are crossed by the Extensor Carpi Radialis Longus?

Accepted Answer

Abductor Pollicis Longus and Extensor Pollicis Brevis

Answer

Extensor Digitorum and Extensor Indicis

Answer

Abductor Pollicis Longus and Extensor Indicis

Answer

Brachioradialis and Extensor Digiti Minimi

Question 6

Ulnar paradox is seen in which of the following conditions?

Accepted Answer

High ulnar nerve palsy

Answer

Low ulnar nerve palsy

Answer

Combined median and ulnar nerve palsy

Answer

Guyon's canal entrapment of ulnar nerve

Question 7

Which of the following is not a component of the carpal tunnel?

Accepted Answer

Ulnar nerve

Answer

Median nerve

Answer

Flexor digitorum superficialis

Answer

Flexor digitorum profundus

Question 8

A 43-year-old man had a previous injury to his wrist involving the ulnar nerve. Which of the following clinical signs would indicate nerve severance?

Accepted Answer

Claw hand involving the ring and little fingers

Answer

Claw hand involving the index and middle fingers

Answer

Atrophy of the thenar muscles

Answer

Absent sensation in the index finger

Question 9

What is true about level III nodes in the axilla?

Accepted Answer

Located superomedial and superior to the pectoralis minor muscle.

Answer

Located posterior to the pectoralis minor muscle.

Answer

Located lateral and inferior to the pectoralis minor muscle.

Answer

Located anterior to the pectoralis minor muscle.

Question 10

Neurological testing of a patient reveals no cutaneous sensation on the tip of the index finger. Such a finding would indicate injury to some portion of which nerve?

Accepted Answer

Median

Answer

Axillary

Answer

Musculocutaneous

Answer

Radial

Upper Limb — MCQs

Upper Limb — MCQs

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