Upper Limb Practice Questions

Q: "Winging" of the scapula is due to injury to which nerve?

Nerve supplying serratus anterior. **Explanation:** **Winging of the Scapula** occurs due to the paralysis of the **Serratus Anterior** muscle. This muscle is supplied by the **Long Thoracic Nerve** (also known as the Nerve of Bell), which arises from the roots of the brachial plexus (C5, C6, C7). 1. **Why Option A is Correct:** The Serratus Anterior is the primary muscle responsible for protraction of the scapula and keeping its medial border closely applied to the posterior thoracic wall. When the Long Thoracic Nerve is injured (often due to trauma, surgery like radical mastectomy, or heavy lifting), the muscle fails to anchor the scapula. Consequently, the medial border and inferior angle of the scapula become prominent and project backward like a "wing," especially when the patient attempts to push against a wall. 2. **Why Incorrect Options are Wrong:** * **Pectoral Nerve:** Supplies the Pectoralis Major and Minor [1]. Injury leads to weakness in adduction and medial rotation of the arm, not winging. * **Subscapular Nerve:** Supplies Subscapularis and Teres Major. Injury affects internal rotation of the humerus. * **Ulnar Nerve:** Supplies muscles of the hand and some forearm muscles. Injury leads to "Claw Hand." **Clinical Pearls for NEET-PG:** * **Nerve Roots:** Remember the mnemonic "C5, 6, 7 reach up to heaven" for the Long Thoracic Nerve. * **Overhead Abduction:** The Serratus Anterior (along with Trapezius) is essential for rotating the scapula to allow abduction of the arm beyond 90 degrees. * **Pseudo-Winging:** Injury to the **Spinal Accessory Nerve** (supplying Trapezius) can also cause scapular displacement, but the winging is more apparent during lateral abduction rather than forward pushing.

Q: Which muscle draws the scapula forward?

Serratus anterior. **Explanation:** The movement of drawing the scapula forward around the thoracic wall is known as **protraction**. The **Serratus anterior** is the primary muscle responsible for this action. It originates from the outer surfaces of the upper eight ribs and inserts into the costal surface of the medial border of the scapula. By pulling the scapula forward, it allows for activities like pushing or punching, earning it the nickname **"the boxer’s muscle."** **Analysis of Incorrect Options:** * **Trapezius (A):** This large muscle primarily functions to rotate, elevate, and **retract** (pull backward) the scapula. Its middle fibers are the chief retractors. * **Rhomboids (B):** Both Rhomboid major and minor act to **retract** the scapula toward the vertebral column and stabilize it. They are antagonists to the serratus anterior regarding horizontal movement. * **Levator scapulae (D):** As the name suggests, its primary role is to **elevate** the superior angle of the scapula and assist in downward rotation. **Clinical Pearls & High-Yield Facts:** * **Long Thoracic Nerve (of Bell):** The serratus anterior is supplied by this nerve (C5, C6, C7). Injury to this nerve (often during axillary surgery or trauma) leads to **"Winging of Scapula,"** where the medial border of the scapula becomes prominent, and the patient cannot protract the arm. * **Overhead Abduction:** The serratus anterior (lower fibers) works with the trapezius to rotate the scapula upward, allowing for abduction of the arm beyond 90 degrees.

Q: A 32-year-old female patient with failing kidneys required dialysis. A search for a suitable vein in her upper limb was unexpectedly difficult. The major vein on the lateral side of the arm was too small, and others were too delicate. Finally, a vein was found on the medial side of the arm that passed through the superficial and deep fascia to join veins beside the brachial artery. Which of the following veins was this?

Basilic. The question describes the anatomical course of the **Basilic vein**, which is a key vessel for vascular access in dialysis (often used for brachiobasilic arteriovenous fistulas) [1]. **1. Why Basilic is Correct:** The basilic vein originates from the medial end of the dorsal venous arch of the hand. It ascends along the **medial side** of the forearm and arm. Crucially, at the middle of the arm (around the insertion of the coracobrachialis), it **pierces the deep fascia** to join the brachial veins (venae comitantes) or continue as the axillary vein [1]. This specific anatomical landmark—piercing the deep fascia to join deep veins—is the definitive identifier in this clinical scenario. **2. Why Other Options are Incorrect:** * **Cephalic Vein:** This is the major vein on the **lateral side** of the arm [1]. It stays superficial until it reaches the deltopectoral groove, where it pierces the clavipectoral fascia to join the axillary vein [1]. * **Medial Cubital Vein:** This is a communication between the cephalic and basilic veins in the cubital fossa [1]. It is superficial and does not pierce the deep fascia to join the brachial veins directly. * **Lateral Cubital:** This is not standard anatomical nomenclature for the major veins of the upper limb. **High-Yield NEET-PG Pearls:** * **Mnemonic:** **B**asilic is **B**elow (pierces deep fascia earlier), **C**ephalic is **C**limbing (stays superficial until the shoulder). * The **Median Cubital Vein** is the preferred site for venipuncture [1] because it is fixed by the underlying bicipital aponeurosis, preventing it from "rolling." * The **Cephalic vein** passes through the deltopectoral triangle to drain into the axillary vein [1].

Q: Movement of the shoulder joint is controlled by which nerve roots?

C5, C6, C7. The shoulder joint is a complex ball-and-socket joint where movements are primarily governed by the **C5, C6, and C7** nerve roots. This is because the major muscles acting on the shoulder are supplied by nerves originating from these segments of the brachial plexus: * **Abduction:** Deltoid and Supraspinatus (**C5, C6** via Axillary and Suprascapular nerves). * **Adduction/Rotation:** Pectoralis major, Latissimus dorsi, and Subscapularis (**C5, C6, C7** via Pectoral, Thoracodorsal, and Subscapular nerves). * **Flexion/Extension:** Coracobrachialis and Deltoid (**C5, C6, C7**). **Analysis of Options:** * **Option A (C8, T1):** These roots form the Lower Trunk. They primarily supply the intrinsic muscles of the hand (fine motor skills) and the long flexors of the fingers. * **Option C (C4, C5, C6):** While C5 and C6 are vital, C4 primarily supplies the diaphragm (Phrenic nerve) and levator scapulae; it does not contribute significantly to the primary movers of the glenohumeral joint. * **Option D (C7, C8, T1, T2):** These roots focus on the forearm and hand. T2 provides sensory innervation to the axilla (intercostobrachial nerve) but no motor control to the shoulder. **High-Yield Clinical Pearls for NEET-PG:** 1. **Erb’s Palsy:** Injury to the Upper Trunk (**C5-C6**) results in the "Policeman’s tip hand," characterized by a loss of shoulder abduction and lateral rotation. 2. **The "Step-like" Rule:** Shoulder movements are C5-C6; Elbow is C5-C6 (flexion) and C7-C8 (extension); Wrist/Hand is C6-C8; Intrinsic hand muscles are T1. 3. **Key Muscle:** The **Serratus Anterior** (Long thoracic nerve, **C5-C7**) is essential for shoulder abduction above 90° (overhead abduction).

Q: The palmar venous network in the palm of the hand gives rise to which of the following veins?

Median antebrachial vein. The venous drainage of the upper limb is a high-yield topic for NEET-PG, often focusing on the origin and termination of superficial veins. ### **Explanation** The **median antebrachial vein** (also known as the median vein of the forearm) originates from the **palmar venous plexus** (network) located in the subcutaneous tissue of the palm. It ascends along the midline of the anterior aspect of the forearm and typically terminates by draining into the median cubital vein or the basilic vein. ### **Analysis of Options** * **Cephalic Vein (Incorrect):** This vein originates from the **lateral (radial) side** of the **dorsal venous network** (arch) on the back of the hand. It travels through the anatomical snuffbox and ascends along the lateral aspect of the forearm and arm. * **Basilic Vein (Incorrect):** This vein originates from the **medial (ulnar) side** of the **dorsal venous network** on the back of the hand. it ascends along the medial aspect of the forearm and arm. * **All the above (Incorrect):** Since the cephalic and basilic veins primarily arise from the dorsal venous arch, not the palmar network, this option is invalid. ### **NEET-PG High-Yield Pearls** * **Dorsal Venous Arch:** Gives rise to the Cephalic (Lateral) and Basilic (Medial) veins. * **Median Cubital Vein:** The most common site for venipuncture; it connects the cephalic and basilic veins in the cubital fossa. * **Deep Venous Drainage:** The deep veins of the palm form the superficial and deep palmar venous arches, which accompany the arterial arches and drain into the radial and ulnar veins. * **Clinical Note:** The median antebrachial vein is highly variable; in some individuals, it bifurcates into the median cephalic and median basilic veins, forming an "M" shaped pattern in the cubital fossa.

Q: Which is a branch of the ulnar nerve in the arm?

No branch. ### Explanation **1. Why "No branch" is the correct answer:** The ulnar nerve (C8, T1) originates from the medial cord of the brachial plexus. In the arm, it descends medial to the brachial artery, pierces the medial intermuscular septum at the midpoint of the humerus, and passes behind the medial epicondyle. **Crucially, the ulnar nerve gives off no motor or cutaneous branches in the arm.** Its first branches arise only after it enters the forearm, distal to the elbow joint. **2. Analysis of Incorrect Options:** * **Option A (To Flexor Carpi Ulnaris):** This is the first muscular branch of the ulnar nerve, but it arises in the **forearm**, just after the nerve passes between the two heads of the FCU [1]. * **Option B (To Flexor Digitorum Profundus):** The ulnar nerve supplies the medial half (ulnar half) of the FDP. Like the branch to the FCU, this branch arises in the **upper part of the forearm**, not the arm. * **Option C (To Flexor Carpi Radialis):** This is incorrect because the FCR is supplied by the **median nerve** [1]. **3. NEET-PG High-Yield Pearls:** * **The "No Branch" Rule:** Both the **Ulnar nerve** and the **Median nerve** give off no branches in the arm (axilla to elbow). The only major nerve of the terminal brachial plexus that branches extensively in the arm is the **Radial nerve**. * **Clinical Correlation:** Because the ulnar nerve has no branches in the arm, a mid-shaft humerus fracture or a high humeral injury will typically spare the forearm muscles but will manifest symptoms once the nerve reaches the hand (e.g., claw hand). * **The "Funny Bone":** The ulnar nerve is most vulnerable to compression at the **retrocondylar groove** (behind the medial epicondyle), where it is superficial and rests directly against the bone.

Q: What are the root values of the axillary nerve?

C5, C6. The **axillary nerve** (also known as the circumflex nerve) is a major terminal branch of the **posterior cord** of the brachial plexus. ### 1. Why C5, C6 is Correct The axillary nerve originates from the posterior cord, which receives contributions from all three trunks of the brachial plexus. However, the specific fibers that form the axillary nerve are derived solely from the **ventral rami of C5 and C6**. These roots provide the motor supply to the deltoid and teres minor muscles and sensory innervation to the "regimental badge" area of the shoulder. ### 2. Analysis of Incorrect Options * **C7, C8 (Option B):** These roots contribute to the radial nerve (C5-T1) and the ulnar nerve (C8-T1), but do not form the axillary nerve. * **C8, T1 (Option C):** These are the root values for the **medial cord** derivatives, such as the ulnar nerve and the medial cutaneous nerves of the arm and forearm. * **D. C5, T1 (Option D):** This represents the entire span of the brachial plexus. While the **radial nerve** carries fibers from C5 to T1, the axillary nerve is restricted to the upper roots. ### 3. Clinical Pearls for NEET-PG * **Course:** It passes through the **quadrangular space** alongside the posterior circumflex humeral artery. [1] * **Injury Site:** Most commonly injured during **anterior dislocation of the shoulder joint** or **fracture of the surgical neck of the humerus**. * **Clinical Presentation:** * **Motor:** Loss of abduction of the arm (15–90 degrees) due to deltoid paralysis. * **Sensory:** Loss of sensation over the lower half of the deltoid (**Regimental Badge area**). * **Deformity:** Flattening of the shoulder contour due to deltoid atrophy.

Q: Modified Allen's test is used to check the patency of the arteries supplying which part of the upper limb?

Wrist. **Explanation:** The **Modified Allen’s Test** is a clinical bedside procedure used to assess the **collateral circulation** of the hand, specifically the patency of the **radial and ulnar arteries** at the level of the **wrist** [1]. **Why Option A is Correct:** The test is performed before procedures like arterial blood gas (ABG) sampling or radial artery cannulation. The clinician compresses both the radial and ulnar arteries at the wrist while the patient makes a tight fist to blanch the palm. Upon releasing pressure from the ulnar artery (while keeping the radial artery compressed), the palm should return to its normal pink color within 5–15 seconds [1]. This confirms that the ulnar artery provides sufficient collateral flow to the superficial palmar arch, ensuring the hand remains perfused even if the radial artery is damaged [1]. **Why Other Options are Incorrect:** * **B & C (Arm and Elbow):** These regions are supplied primarily by the brachial artery and its proximal branches (profunda brachii). Patency here is typically assessed via the brachial pulse or Doppler studies, not Allen’s test. * **D (Forearm):** While the radial and ulnar arteries travel through the forearm, the test specifically evaluates their terminal adequacy at the wrist to supply the hand [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Normal Result:** Reperfusion within ** 15 seconds (indicates inadequate collateral circulation; radial artery cannulation is contraindicated). * **Anatomy:** The test primarily evaluates the integrity of the **superficial palmar arch**, which is mainly formed by the ulnar artery [1].

Q: A patient presents with a history of trauma to the right upper limb. The patient has lost the ability to extend the metacarpophalangeal joints, but has no wrist drop and normal extension of the interphalangeal joints. Which nerve is most likely involved?

Posterior interosseous nerve. ### Explanation The key to solving this question lies in understanding the functional anatomy of the radial nerve and its branches. **1. Why Posterior Interosseous Nerve (PIN) is correct:** The PIN is the deep branch of the radial nerve that arises near the elbow (after the radial nerve has already supplied the ECRL and ECRB). It supplies the **Extensor Digitorum**, which is the primary extensor of the **metacarpophalangeal (MCP) joints**. [1] * **No Wrist Drop:** Because the Extensor Carpi Radialis Longus (ECRL) is supplied by the main radial nerve *before* it bifurcates, wrist extension is preserved (though it may deviate radially). * **IP Joint Extension:** Extension of the interphalangeal (IP) joints is primarily performed by the **lumbricals and interossei** (supplied by the ulnar and median nerves), not the PIN. [1] Therefore, IP extension remains intact. **2. Why other options are incorrect:** * **Radial Nerve:** A lesion of the main radial nerve (e.g., in the spiral groove) would result in **wrist drop** because the ECRL, ECRB, and Brachioradialis would be paralyzed along with the finger extensors. [1] * **Ulnar Nerve:** Injury leads to "claw hand" (hyperextension of MCP and flexion of IP joints) due to lumbrical paralysis, but it does not cause a loss of active MCP extension. [1] * **Median Nerve:** Primarily involves thumb opposition and finger flexion (lateral two digits); it does not control MCP extension. **3. High-Yield Clinical Pearls for NEET-PG:** * **PIN Syndrome (Frohse’s Arcade):** The PIN can be compressed as it passes between the two heads of the **supinator muscle**. * **Finger Drop vs. Wrist Drop:** PIN palsy causes "finger drop" (loss of MCP extension) without "wrist drop." * **Sensory Note:** The PIN is a purely motor nerve to muscles, but it carries sensory fibers to the **carpal ligaments/joint capsule**. It does not supply any cutaneous sensation.

Question 1

"Winging" of the scapula is due to injury to which nerve?

Accepted Answer

Nerve supplying serratus anterior

Answer

Pectoral nerve

Answer

Subscapular nerve

Answer

Ulnar nerve

Question 2

Which muscle draws the scapula forward?

Accepted Answer

Serratus anterior

Answer

Trapezius

Answer

Rhomboids

Answer

Levator scapulae

Question 3

A 32-year-old female patient with failing kidneys required dialysis. A search for a suitable vein in her upper limb was unexpectedly difficult. The major vein on the lateral side of the arm was too small, and others were too delicate. Finally, a vein was found on the medial side of the arm that passed through the superficial and deep fascia to join veins beside the brachial artery. Which of the following veins was this?

Accepted Answer

Basilic

Answer

Lateral cubital

Answer

Cephalic

Answer

Medial cubital

Question 4

Movement of the shoulder joint is controlled by which nerve roots?

Accepted Answer

C5, C6, C7

Answer

C8, T1

Answer

C4, C5, C6

Answer

C7, C8, T1, T2

Question 5

The palmar venous network in the palm of the hand gives rise to which of the following veins?

Accepted Answer

Median antebrachial vein

Answer

Cephalic vein

Answer

Basilic vein

Answer

All the above

Question 6

Which is a branch of the ulnar nerve in the arm?

Accepted Answer

No branch

Answer

To Flexor Carpi Ulnaris (FCU)

Answer

To Flexor Digitorum Profundus (FDP)

Answer

To Flexor Carpi Radialis (FCR)

Question 7

What are the root values of the axillary nerve?

Accepted Answer

C5, C6

Answer

C7, C8

Answer

C8, T1

Answer

C5, T1

Question 8

Modified Allen's test is used to check the patency of the arteries supplying which part of the upper limb?

Accepted Answer

Wrist

Answer

Arm

Answer

Elbow

Answer

Forearm

Question 9

A patient presents with a history of trauma to the right upper limb. The patient has lost the ability to extend the metacarpophalangeal joints, but has no wrist drop and normal extension of the interphalangeal joints. Which nerve is most likely involved?

Accepted Answer

Posterior interosseous nerve

Answer

Ulnar nerve

Answer

Median nerve

Answer

Radial nerve

Question 10

A patient presents with a laceration of the wrist but with no vascular injury. On examination, a structure lateral to the flexor digitorum superficialis is found to be injured. What action can the patient most likely not perform?

Accepted Answer

Opposition of the thumb

Answer

Abduction of the 2nd digit

Answer

Adduction of the 2nd digit

Answer

Flexion of the thumb

Upper Limb — MCQs

Upper Limb — MCQs

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