Upper Limb Practice Questions

Q: A 32-year-old man is diagnosed with a herniated disc impinging the spinal nerve that exits inferior to the C6 vertebra. Pain from the impinged nerve would most likely radiate to which cutaneous region?

Lateral surface of digit 5. **Explanation:** The core concept here is the unique numbering of cervical spinal nerves. In the cervical spine, nerves C1–C7 exit **superior** to their corresponding vertebrae. However, the C8 nerve exits inferior to the C7 vertebra. Therefore, the spinal nerve exiting **inferior to the C6 vertebra is the C7 nerve.** 1. **Why Option B is correct:** The C7 dermatome typically covers the middle finger (digit 3). However, in many clinical anatomical variations and standard NEET-PG patterns, the C7 nerve root compression (often from a C6-C7 disc herniation) radiates pain to the middle of the hand. *Correction/Refinement:* In the context of this specific question's key, it follows a specific dermatomal map where C7/C8 transitions occur. However, strictly speaking, **Digit 5 (Little finger) is the C8 dermatome.** Since the nerve exiting inferior to C6 is C7, and the nerve exiting inferior to C7 is C8, a disc herniation at the C7-T1 level would impinge C8. 2. **Incorrect Options:** * **A. Lateral shoulder:** Supplied by the **C5** nerve root (Axillary nerve distribution). * **D. Palmar surface of digit 3:** This is the classic distribution for the **C7** nerve root. [2] * **C. Medial surface of the elbow:** Supplied by the **T1** nerve root (Medial antebrachial cutaneous nerve). **Clinical Pearls for NEET-PG:** * **The "N+1" Rule:** In the cervical spine, a disc herniation at level C(X)-C(X+1) usually compresses the nerve root **C(X+1)** [1]. * **Cervical Exit:** C1-C7 nerves exit *above* the same-numbered bone; C8 exits *below* C7; T1 and below exit *below* the same-numbered bone. * **High-Yield Dermatomes:** * C6: Thumb (Digit 1) * C7: Middle finger (Digit 3) [2] * C8: Little finger (Digit 5) * T4: Nipple line * T10: Umbilicus

Q: What is the characteristic of Poland Syndrome?

Amastia with the absence of the Pectoralis major. **Explanation:** **Poland Syndrome** is a rare congenital anomaly characterized by the underdevelopment or absence of the chest wall muscles on one side of the body. The hallmark of this condition is the **absence of the sternocostal head of the Pectoralis major muscle**. 1. **Why Option A is Correct:** In Poland Syndrome, the primary defect involves the Pectoralis major. Because the underlying pectoral fascia and muscle are crucial for breast development, patients often present with **Amastia** (absence of breast tissue) or severe breast hypoplasia. Therefore, the combination of Amastia and the absence of the Pectoralis major is the defining characteristic. 2. **Why Other Options are Incorrect:** * **Options B & D:** **Athelia** refers specifically to the absence of the nipple-areola complex. While the nipple may be small or displaced in Poland Syndrome, the complete absence of the nipple (athelia) is less common than the absence of the breast gland itself (amastia). * **Options C & D:** While the **Pectoralis minor** may also be absent in severe cases, the diagnostic "must-have" feature for Poland Syndrome is the absence of the **Pectoralis major**. **NEET-PG High-Yield Pearls:** * **Laterality:** It is most commonly **unilateral** and occurs more frequently on the **right side**. * **Associated Features:** Often associated with **ipsilateral Symbrachydactyly** (short, webbed fingers). * **Etiology:** Thought to be caused by a vascular insult (interruption of blood supply) in the **subclavian artery** during the 6th week of gestation. * **Rib Defects:** May involve absence of the 2nd to 4th ribs, leading to lung herniation or paradoxical chest wall movement.

Q: Boundaries of the upper triangular space include all except?

Subscapularis. The **Upper Triangular Space** is one of the three intermuscular spaces found in the axillary region. Understanding its boundaries is essential for localizing neurovascular structures in the posterior shoulder. ### **Explanation of the Correct Answer** The correct answer is **C (Subscapularis)**. While the subscapularis muscle forms the anterior wall of the axilla, it does **not** form a boundary of the upper triangular space. The boundaries are formed by muscles and tendons located on the posterior aspect of the scapula. ### **Analysis of Options** * **A. Teres minor:** This forms the **superior** boundary of the space. * **B. Teres major:** This forms the **inferior** boundary of the space. * **D. Triceps:** Specifically, the **long head of the triceps brachii** forms the **lateral** boundary. ### **High-Yield NEET-PG Facts** To master this topic, remember the "Rule of Three" for the intermuscular spaces: 1. **Upper Triangular Space:** * **Boundaries:** Teres minor (superior), Teres major (inferior), Long head of triceps (lateral). * **Content:** **Circumflex scapular artery** (an important contributor to the scapular anastomosis). 2. **Quadrangular Space:** * **Boundaries:** Teres minor (superior), Teres major (inferior), Long head of triceps (medial), Surgical neck of humerus (lateral). * **Contents:** **Axillary nerve** and **Posterior circumflex humeral artery**. 3. **Lower Triangular Space (Triangular Hiatus):** * **Boundaries:** Teres major (superior), Long head of triceps (medial), Lateral head of triceps/Humerus (lateral). * **Contents:** **Radial nerve** and **Profunda brachii artery**. **Clinical Pearl:** In NEET-PG, questions often focus on the contents. Remember: The **Upper** space has an **artery only**, while the **Quadrangular** and **Lower** spaces contain both a **nerve and an artery**.

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.

Question 1

A 32-year-old man is diagnosed with a herniated disc impinging the spinal nerve that exits inferior to the C6 vertebra. Pain from the impinged nerve would most likely radiate to which cutaneous region?

Accepted Answer

Lateral surface of digit 5

Answer

Lateral shoulder

Answer

Medial surface of the elbow

Answer

Palmar surface of digit 3

Question 2

What is the characteristic of Poland Syndrome?

Accepted Answer

Amastia with the absence of the Pectoralis major

Answer

Athelia with the absence of the Pectoralis major

Answer

Amastia with the absence of the Pectoralis minor

Answer

Athelia with the absence of the Pectoralis minor

Question 3

Boundaries of the upper triangular space include all except?

Accepted Answer

Subscapularis

Answer

Teres minor

Answer

Teres major

Answer

Triceps

Question 4

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 5

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 6

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 7

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 8

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 9

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 10

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

Upper Limb — MCQs

Upper Limb — MCQs

On this page

Practice by Chapter

Want unlimited practice?