Upper Limb Practice Questions

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].

Q: A 45-year-old male is admitted to the hospital after accidentally walking through a plate glass door in a bar while intoxicated. Physical examination shows multiple lacerations to the upper limb, with inability to flex the distal interphalangeal joints of the fourth and fifth digits. Which of the following muscles is most likely affected?

Flexor digitorum profundus. ### Explanation **1. Why Flexor Digitorum Profundus (FDP) is Correct:** The key to this question lies in the specific joint affected: the **Distal Interphalangeal (DIP) joint**. The Flexor Digitorum Profundus is the **only** muscle responsible for flexing the DIP joints of the fingers [2]. It originates in the forearm, and its tendons insert into the bases of the distal phalanges. In this clinical scenario, the inability to flex the DIP joints of the 4th and 5th digits specifically indicates an injury to the medial half of the FDP (supplied by the Ulnar nerve) or its respective tendons [1]. **2. Why the Other Options are Incorrect:** * **Flexor Digitorum Superficialis (FDS):** This muscle inserts into the middle phalanges. Its primary action is flexion at the **Proximal Interphalangeal (PIP)** joints, not the DIP joints. * **Lumbricals:** These muscles insert into the extensor expansions. Their primary action is to flex the Metacarpophalangeal (MCP) joints and **extend** the IP joints (both PIP and DIP) [2]. * **Interossei:** Similar to lumbricals, the palmar and dorsal interossei assist in MCP flexion and IP extension, in addition to adduction (PAD) and abduction (DAB) of the fingers [1]. They do not flex the DIP joints. **3. High-Yield Clinical Pearls for NEET-PG:** * **Dual Nerve Supply:** The FDP is a "hybrid muscle." The lateral half (digits 2 & 3) is supplied by the **Median Nerve** (Anterior Interosseous Nerve), while the medial half (digits 4 & 5) is supplied by the **Ulnar Nerve** [1]. * **Jersey Finger:** A common sports injury involving the avulsion of the FDP tendon from the distal phalanx, resulting in the inability to flex the DIP joint. * **Testing Tip:** To isolate the FDP during an exam, hold the PIP joint in extension and ask the patient to flex the fingertip.

Q: Which muscle crosses both the shoulder and elbow joints?

Biceps brachii. **Explanation:** To cross a joint, a muscle must originate proximal to the joint and insert distal to it. Muscles that cross two joints are termed **bi-articular muscles**. **Why Biceps Brachii is Correct:** The Biceps brachii is a classic bi-articular muscle of the anterior compartment of the arm. * **Origin:** The long head originates from the supraglenoid tubercle of the scapula, and the short head from the coracoid process. Both points are proximal to the **shoulder joint**. * **Insertion:** It inserts into the radial tuberosity and the bicipital aponeurosis, both distal to the **elbow joint**. * **Action:** Consequently, it acts on both joints, causing flexion at the shoulder and both flexion and supination at the elbow. **Analysis of Incorrect Options:** * **Coracobrachialis:** Originates from the coracoid process and inserts into the middle of the humerus. It crosses only the **shoulder joint**. * **Medial head of triceps:** Originates from the posterior surface of the humerus (distal to the radial groove) and inserts into the olecranon. It crosses only the **elbow joint**. (Note: Only the *long head* of the triceps is bi-articular). * **Brachialis:** Originates from the distal half of the anterior humerus and inserts into the ulnar tuberosity. It crosses only the **elbow joint** and is the primary flexor of the elbow. **High-Yield NEET-PG Pearls:** * **The "Three-Joint" Rule:** The long head of the triceps and the long head of the biceps are the components that make these muscle groups bi-articular. * **Nerve Supply:** All muscles in the anterior compartment (Biceps, Brachialis, Coracobrachialis) are supplied by the **Musculocutaneous nerve**. * **Clinical Sign:** Rupture of the long head of the biceps tendon results in a characteristic bulge in the mid-arm known as the **"Popeye deformity."**

Q: What nerve supplies the biceps brachii muscle?

Musculocutaneous nerve. **Explanation:** The **musculocutaneous nerve** is the correct answer as it is the primary motor supply to the muscles of the **anterior compartment of the arm** (coracobrachialis, biceps brachii, and brachialis). Arising from the lateral cord of the brachial plexus (C5–C7), it pierces the coracobrachialis muscle to descend between the biceps and brachialis, supplying both. **Analysis of Incorrect Options:** * **Radial Nerve:** Supplies the posterior compartment of the arm (triceps brachii) and forearm. While it provides a small sensory contribution to the lateral part of the brachialis, it does not supply the biceps. * **Median Nerve:** It passes through the arm without giving off any motor branches. Its primary motor distribution begins in the anterior compartment of the forearm and the hand. * **Axillary Nerve:** Supplies the deltoid and teres minor muscles. It is responsible for shoulder abduction and lateral rotation, not elbow flexion. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Lateral cord of the brachial plexus (Roots: **C5, C6, C7**). * **Sensory Continuation:** After supplying the arm muscles, it continues as the **Lateral Cutaneous Nerve of the Forearm**, supplying the skin of the lateral forearm. * **Clinical Sign:** Injury to this nerve results in a significant loss of elbow flexion and weakness in supination (as the biceps is the most powerful supinator of the flexed forearm). The **biceps reflex (C5-C6)** tests the integrity of this nerve. *(Note: All provided references were evaluated and found to be irrelevant to the specific neuroanatomy of the biceps brachii muscle.)*

Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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

Question 8

A 45-year-old male is admitted to the hospital after accidentally walking through a plate glass door in a bar while intoxicated. Physical examination shows multiple lacerations to the upper limb, with inability to flex the distal interphalangeal joints of the fourth and fifth digits. Which of the following muscles is most likely affected?

Accepted Answer

Flexor digitorum profundus

Answer

Flexor digitorum superficialis

Answer

Lumbricals

Answer

Interossei

Question 9

Which muscle crosses both the shoulder and elbow joints?

Accepted Answer

Biceps brachii

Answer

Coracobrachialis

Answer

Medial head of triceps

Answer

Brachialis

Question 10

What nerve supplies the biceps brachii muscle?

Accepted Answer

Musculocutaneous nerve

Answer

Radial nerve

Answer

Median nerve

Answer

Axillary nerve

Upper Limb — MCQs

Upper Limb — MCQs

On this page

Practice by Chapter

Want unlimited practice?