Upper Limb Practice Questions

Q: Which structure passes deep to the flexor retinaculum at the wrist?

Median nerve. **Explanation:** The **flexor retinaculum** (transverse carpal ligament) converts the concave anterior surface of the carpus into the **carpal tunnel** [1]. Understanding the contents of this tunnel is a high-yield topic for NEET-PG. **1. Why the Median Nerve is Correct:** The median nerve is the most superficial structure within the carpal tunnel, passing directly deep to the flexor retinaculum [1]. Along with the median nerve, the tunnel contains nine tendons: four of the *flexor digitorum superficialis*, four of the *flexor digitorum profundus*, and one of the *flexor pollicis longus*. **2. Why the Other Options are Incorrect:** * **Ulnar Nerve & Ulnar Artery:** These structures pass **superficial** to the flexor retinaculum through a separate fibro-osseous canal known as **Guyon’s canal** (ulnar canal) [1]. They do not enter the carpal tunnel. * **Radial Nerve:** At the wrist, the superficial branch of the radial nerve is located laterally and posteriorly; it does not pass through any anterior compartment or deep to the retinaculum. **3. Clinical Pearls & High-Yield Facts:** * **Carpal Tunnel Syndrome (CTS):** Compression of the median nerve within the tunnel leads to paresthesia in the lateral 3.5 fingers and wasting of the **thenar muscles** (LOAF: Lateral two lumbricals, Opponens pollicis, Abductor pollicis brevis, Flexor pollicis brevis). * **Palmar Cutaneous Branch:** This branch of the median nerve arises proximal to the wrist and passes **superficial** to the retinaculum [1]. Therefore, sensation over the thenar eminence is **spared** in carpal tunnel syndrome. * **Palmaris Longus:** If present, its tendon passes superficial to the flexor retinaculum.

Q: A patient is diagnosed to have anterior interosseous nerve syndrome. Which of the following muscles is not affected in this syndrome?

Lateral half of flexor digitorum superficialis. The **Anterior Interosseous Nerve (AIN)** is the largest branch of the Median nerve, arising in the proximal forearm. It is a purely motor nerve that supplies the deep muscles of the anterior compartment of the forearm. **Why Option D is correct:** The **Flexor Digitorum Superficialis (FDS)** is a muscle of the intermediate layer of the forearm. It is supplied directly by the **main trunk of the Median nerve** before it gives off the AIN branch. Therefore, in AIN syndrome, the FDS remains functional. **Why other options are incorrect:** The AIN specifically supplies exactly **2.5 muscles** in the deep flexor compartment: * **Flexor Pollicis Longus (Option A):** Responsible for flexion of the thumb IP joint. * **Pronator Quadratus (Option B):** Responsible for forearm pronation. * **Lateral half (Radial half) of Flexor Digitorum Profundus (Option C):** Responsible for flexion of the DIP joints of the index and middle fingers. **Clinical Pearls for NEET-PG:** 1. **Kiloh-Nevin Syndrome:** Another name for AIN syndrome. It is often an entrapment neuropathy (e.g., between heads of pronator teres). 2. **The "OK" Sign Test:** This is the classic clinical test for AIN syndrome. A patient with AIN palsy cannot make a circle with their thumb and index finger (pulp-to-pulp contact instead of tip-to-tip) due to weakness of FPL and the lateral half of FDP. 3. **Sensory Sparing:** Since the AIN has no cutaneous branches, there is **no sensory loss** in the hand, distinguishing it from a proximal Median nerve injury [1].

Q: Which of the following muscles has an attachment on the marked part?

Pectoralis minor. ***Pectoralis minor*** - The **pectoralis minor** muscle has its insertion on the **coracoid process** of the scapula, which is the marked anatomical structure. - This muscle originates from the **3rd-5th ribs** and helps in **protraction** and **depression** of the scapula. *Long head of biceps* - The **long head of biceps brachii** originates from the **supraglenoid tubercle** of the scapula, not the coracoid process. - It passes through the **bicipital groove** of the humerus and assists in **shoulder flexion** and **forearm supination**. *Pectoralis major* - The **pectoralis major** inserts on the **lateral lip of the bicipital groove** of the humerus, not on any part of the scapula. - It originates from the **clavicle**, **sternum**, and **costal cartilages** and is responsible for **shoulder adduction** and **internal rotation**. *Long head of triceps* - The **long head of triceps brachii** originates from the **infraglenoid tubercle** of the scapula, which is located below the glenoid cavity. - This muscle is primarily responsible for **elbow extension** and **shoulder adduction**, not attachment to the coracoid process.

Q: A 48-year-old female court stenographer is admitted to the orthopedic clinic with symptoms of carpal tunnel syndrome, with which she has suffered for almost a year. Which muscles most typically become weakened in this condition?

Thenar. **Explanation:** **1. Why "Thenar" is correct:** Carpal tunnel syndrome (CTS) results from the compression of the **median nerve** as it passes through the carpal tunnel deep to the flexor retinaculum [1]. The median nerve provides motor innervation to the **thenar muscles** (Abductor pollicis brevis, Flexor pollicis brevis, and Opponens pollicis) via its recurrent branch. Chronic compression leads to denervation, resulting in weakness and characteristic wasting (atrophy) of the thenar eminence, often described as "ape-hand" deformity. **2. Why other options are incorrect:** * **Dorsal and Palmar Interossei (A & D):** These muscles are exclusively innervated by the **deep branch of the ulnar nerve**. They are responsible for abduction (DAB) and adduction (PAD) of the fingers and remain unaffected in CTS. * **Lumbricals III and IV (B):** These are the medial two lumbricals, which are innervated by the **ulnar nerve**. The median nerve innervates only the lateral two lumbricals (I and II). **3. Clinical Pearls for NEET-PG:** * **Sensory Loss:** Occurs over the palmar aspect of the lateral 3½ digits [1]. Note that the **palmar cutaneous branch** of the median nerve arises *proximal* to the carpal tunnel; thus, sensation over the central palm is usually spared [2]. * **Tinel’s Sign:** Percussion over the flexor retinaculum causes tingling in the median nerve distribution. * **Phalen’s Test:** Forced flexion of the wrist for 60 seconds exacerbates symptoms. * **Most Common Nerve Involved:** Median nerve is the most common nerve involved in entrapment neuropathies of the upper limb.

Q: Which of the following arteries is a branch of the first part of the axillary artery?

Superior thoracic artery. The axillary artery is the continuation of the subclavian artery, extending from the outer border of the first rib to the lower border of the teres major muscle. It is divided into three parts by the **pectoralis minor muscle**: * **1st Part:** Medial to the muscle (1 branch) * **2nd Part:** Posterior to the muscle (2 branches) * **3rd Part:** Lateral to the muscle (3 branches) **Correct Option Explanation:** * **B. Superior thoracic artery:** This is the **only** branch of the first part. It is a small vessel that supplies the first and second intercostal spaces and the upper part of the serratus anterior. **Incorrect Options Explanation:** * **A. Lateral thoracic artery:** This is a branch of the **second part**. It follows the lower border of the pectoralis minor and is a major supply to the breast [1]. * **D. Thoracoacromial artery:** This is also a branch of the **second part**. It pierces the clavipectoral fascia and divides into four branches (Acromial, Deltoid, Pectoral, and Clavicular). * **C. Subscapular artery:** This is the largest branch of the axillary artery and arises from the **third part**. **High-Yield NEET-PG Pearls:** 1. **Mnemonic for branches:** "**S**he **T**asted **L**ittle **A**pples **S**o **P**ink" (**S**uperior thoracic, **T**horacoacromial, **L**ateral thoracic, **A**nterior circumflex humeral, **S**ubscapular, **P**osterior circumflex humeral). 2. **Clinical Correlation:** The axillary artery is closely related to the cords of the brachial plexus (named according to their position relative to the second part). 3. **Surgical Landmark:** The pectoralis minor is the key landmark for identifying the parts of the artery during axillary lymph node dissection [1].

Q: While carrying a heavy suitcase, the downward dislocation of the glenohumeral joint is resisted by which of the following muscles EXCEPT?

Latissimus dorsi. Explanation: The stability of the glenohumeral joint depends on both static and dynamic stabilizers. When carrying a heavy weight (like a suitcase), the primary force acting on the shoulder is a **downward vertical pull**, which threatens to dislocate the humeral head inferiorly. **Why Latissimus dorsi is the correct answer:** The **Latissimus dorsi** is a large, powerful muscle that originates from the trunk and inserts into the floor of the bicipital groove. Its primary actions are adduction, internal rotation, and extension of the humerus. Because its insertion point is relatively low and its pull is directed downwards and backwards, it does **not** resist downward dislocation; in fact, it can contribute to the downward pull on the humerus. **Why the other options are incorrect:** The muscles that resist downward dislocation are those with a **vertical or near-vertical orientation** that cross the joint from the acromion/coracoid process to the humerus: * **Deltoid (A):** The multipennate fibers (especially the middle part) provide a strong upward pull, acting as a primary dynamic stabilizer against gravity. * **Coracobrachialis (B) & Short head of biceps (C):** Both muscles originate from the coracoid process and insert distally on the humerus and radius, respectively. Their vertical orientation allows them to act as "shunts," pulling the humeral head upwards into the glenoid cavity when a heavy load is carried. **High-Yield Clinical Pearls for NEET-PG:** * **Static Stabilizers:** The most important static stabilizer against downward dislocation in the *adducted* position is the **Superior Glenohumeral Ligament (SGHL)** and the **Coracohumeral ligament**. * **Rotator Cuff:** While the Supraspinatus prevents downward displacement, the Subscapularis and Infraspinatus primarily provide horizontal stability. * **Nerve Injury:** The Axillary nerve is most at risk during inferior (downward) dislocations of the shoulder.

Q: The lateral antebrachial cutaneous nerve originates from which nerve?

Musculocutaneous nerve. The **lateral antebrachial cutaneous nerve** is the terminal sensory continuation of the **musculocutaneous nerve**. After the musculocutaneous nerve (C5–C7) pierces the coracobrachialis and supplies the muscles of the anterior compartment of the arm (biceps brachii and brachialis), it emerges lateral to the biceps tendon at the elbow. At this point, it pierces the deep fascia to become the lateral antebrachial cutaneous nerve, providing sensation to the skin of the lateral aspect of the forearm. **Analysis of Incorrect Options:** * **Axillary nerve:** Supplies the deltoid and teres minor muscles and terminates as the *upper lateral cutaneous nerve of the arm* (supplying the "regimental badge" area). * **Medial cord nerve:** The medial cord gives rise to the *medial antebrachial cutaneous nerve*, which supplies the skin of the medial forearm. * **Radial nerve:** Gives rise to the *posterior antebrachial cutaneous nerve* and the *lower lateral cutaneous nerve of the arm*, but not the lateral cutaneous nerve of the forearm. **Clinical Pearls for NEET-PG:** * **Site of Injury:** The musculocutaneous nerve is most commonly injured by heavy lifting or trauma to the axilla. Loss of the lateral antebrachial cutaneous nerve results in anesthesia over the lateral forearm. * **Biceps Reflex:** The musculocutaneous nerve mediates the afferent and efferent limbs of the **C5-C6** biceps tendon reflex. * **Anatomical Landmark:** The nerve passes between the biceps brachii and brachialis muscles before becoming superficial.

Q: Enumerate the two structures passing through the quadrangular space of the back.

Posterior circumflex humeral artery and Axillary nerve.. The **Quadrangular Space** is a clinically significant anatomical gap located in the posterior scapular region. It serves as a vital passageway for neurovascular structures moving from the axilla to the posterior arm. **1. Why Option C is Correct:** The boundaries of the quadrangular space are formed by the Teres minor (superior), Teres major (inferior), long head of Triceps (medial), and the surgical neck of the humerus (lateral). The two structures that traverse this space are: * **Axillary Nerve:** Supplies the deltoid and teres minor muscles. * **Posterior Circumflex Humeral Artery:** Provides blood supply to the shoulder joint and surrounding muscles. **2. Analysis of Incorrect Options:** * **Option A:** The **Suprascapular artery and nerve** pass through/above the suprascapular notch, not the quadrangular space. * **Option B:** The **Subscapular artery** branches into the circumflex scapular artery, which passes through the *Triangular Space*. * **Option D:** The **Profunda brachii artery and Radial nerve** pass through the **Lower Triangular Space** (also known as the Triangular Interval), located inferior to the quadrangular space. **3. Clinical Pearls for NEET-PG:** * **Quadrangular Space Syndrome:** Compression of the axillary nerve in this space (often by fibrous bands or hypertrophy of muscles) leads to weakness in shoulder abduction and atrophy of the deltoid. * **Surgical Neck Fracture:** Fractures at the surgical neck of the humerus most commonly damage the structures within the quadrangular space, particularly the **Axillary nerve**. * **High-Yield Mnemonic:** Remember the "Triangular Interval" contains the **Radial** nerve (R for Radial, R for Interval).

Q: A suspect is brought in after sustaining a gunshot wound to the arm, resulting in damage to the median nerve. Which of the following symptoms is likely produced by this nerve damage?

Ape hand. The **Median Nerve** is often referred to as the "Laborer’s Nerve." Damage to this nerve, particularly at the level of the arm or elbow (high lesion), results in the loss of supply to the **thenar muscles** (Abductor pollicis brevis, Flexor pollicis brevis, and Opponens pollicis). [1] **Why "Ape Hand" is correct:** When the thenar muscles atrophy, the thumb loses its ability to abduct and oppose. It falls back into the same plane as the rest of the fingers due to the unopposed action of the Adductor pollicis (supplied by the Ulnar nerve). This flattened appearance of the palm resembles the hand of a simian, hence the term **Ape Hand deformity**. **Analysis of Incorrect Options:** * **A. Waiter’s tip hand:** This is characteristic of **Erb’s Palsy** (injury to the upper trunk of the brachial plexus, C5-C6). The arm hangs by the side, medially rotated and pronated. * **B. Claw hand:** This results from **Ulnar nerve** injury. It is characterized by hyperextension at the metacarpophalangeal (MCP) joints and flexion at the interphalangeal (IP) joints, most prominent in the ring and little fingers. [1] * **C. Wrist drop:** This is the hallmark of **Radial nerve** injury (often due to mid-shaft humerus fractures), resulting in the paralysis of the extensors of the wrist and digits. [1] **High-Yield Clinical Pearls for NEET-PG:** * **Pointing Index/Benedict’s Hand:** When a patient with a high median nerve lesion tries to make a fist, the index and middle fingers remain extended (due to loss of Flexor Digitorum Profundus and Superficialis). * **Million Dollar Nerve:** The recurrent branch of the median nerve; its injury causes Ape Hand without sensory loss. * **Supracondylar Fracture of Humerus:** The most common cause of high median nerve palsy in children. [1]

Question 1

All of the following are affected in low radial nerve palsy except?

Accepted Answer

Extensor carpi radialis longus

Answer

Extensor carpi radialis brevis

Answer

Finger extensors

Answer

Sensation on dorsum of hand

Question 2

Which structure passes deep to the flexor retinaculum at the wrist?

Accepted Answer

Median nerve

Answer

Ulnar nerve

Answer

Radial nerve

Answer

Ulnar artery

Question 3

A patient is diagnosed to have anterior interosseous nerve syndrome. Which of the following muscles is not affected in this syndrome?

Accepted Answer

Lateral half of flexor digitorum superficialis

Answer

Flexor pollicis longus

Answer

Pronator quadratus

Answer

Lateral half of flexor digitorum profundus

Question 4

Which of the following muscles has an attachment on the marked part?

Accepted Answer

Pectoralis minor

Answer

Long head of biceps

Answer

Pectoralis major

Answer

Long head of triceps

Question 5

A 48-year-old female court stenographer is admitted to the orthopedic clinic with symptoms of carpal tunnel syndrome, with which she has suffered for almost a year. Which muscles most typically become weakened in this condition?

Accepted Answer

Thenar

Answer

Dorsal interossei

Answer

Lumbricals III and IV

Answer

Palmar interossei

Question 6

Which of the following arteries is a branch of the first part of the axillary artery?

Accepted Answer

Superior thoracic artery

Answer

Lateral thoracic artery

Answer

Subscapular artery

Answer

Thoracoacromial artery

Question 7

While carrying a heavy suitcase, the downward dislocation of the glenohumeral joint is resisted by which of the following muscles EXCEPT?

Accepted Answer

Latissimus dorsi

Answer

Deltoid

Answer

Coracobrachialis

Answer

Short head of biceps

Question 8

The lateral antebrachial cutaneous nerve originates from which nerve?

Accepted Answer

Musculocutaneous nerve

Answer

Axillary nerve

Answer

Medial cord nerve

Answer

Radial nerve

Question 9

Enumerate the two structures passing through the quadrangular space of the back.

Accepted Answer

Posterior circumflex humeral artery and Axillary nerve.

Answer

Suprascapular artery and Axillary nerve.

Answer

Subscapular artery and Radial nerve.

Answer

Profunda brachii artery and Radial nerve.

Question 10

A suspect is brought in after sustaining a gunshot wound to the arm, resulting in damage to the median nerve. Which of the following symptoms is likely produced by this nerve damage?

Accepted Answer

Ape hand

Answer

Waiter's tip hand

Answer

Claw hand

Answer

Wrist drop

Upper Limb — MCQs

Upper Limb — MCQs

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