Upper Limb Practice Questions

Q: All metacarpals of the hand are endowed with one epiphysis each, which is usually located near the head of the metacarpal, except for which one?

Thumb metacarpal. The ossification pattern of the metacarpals is a high-yield topic in osteology. Typically, a long bone consists of a shaft (diaphysis) and two ends. In the hand, the metacarpals are classified as "miniature long bones," which characteristically possess only **one epiphysis** [1]. **1. Why the Thumb Metacarpal is the Correct Answer:** In the **2nd, 3rd, 4th, and 5th metacarpals**, the single epiphysis is located at the **distal end (the head)**. However, the **1st metacarpal (thumb)** is the exception; its single epiphysis is located at the **proximal end (the base)** [1]. This makes the thumb metacarpal morphologically similar to a phalanx, as all phalanges also have their epiphyses at their proximal bases. **2. Why the Other Options are Incorrect:** * **Options A, B, and D (Index, Ring, and Middle metacarpals):** These are the "typical" metacarpals. Their secondary centers of ossification appear at the distal end (head) around age 2 and fuse with the shaft by age 18–20. They do not follow the proximal epiphysis pattern seen in the thumb. **Clinical Pearls & High-Yield Facts for NEET-PG:** * **Pseudo-epiphyses:** Occasionally, a "pseudo-epiphysis" may appear at the distal end of the 1st metacarpal or the proximal end of the 2nd metacarpal. * **Nutrient Foramen:** The nutrient foramina of the metacarpals are directed **away** from the growing end (the epiphysis). Therefore, the foramen points distally in the thumb metacarpal and proximally in the 2nd–5th metacarpals ("To the elbow I go, from the knee I flee"). * **Age Estimation:** The appearance and fusion of these epiphyses are critical markers in forensic medicine and pediatrics for determining skeletal age [1].

Q: The transverse carpal ligament is also known as which of the following?

Flexor retinaculum of the hand. The **transverse carpal ligament (TCL)** is the anatomical synonym for the **flexor retinaculum of the hand**. It is a strong, fibrous band that arches over the carpal bones, converting the deep groove on the anterior surface of the carpus into the **carpal tunnel**. **Why Option A is correct:** The flexor retinaculum attaches medially to the pisiform and the hook of the hamate, and laterally to the tubercles of the scaphoid and trapezium [1]. Its primary function is to act as a "tie-beam" to maintain the transverse carpal arch and serve as a pulley for the flexor tendons, preventing them from "bowstringing" during wrist flexion. **Why the other options are incorrect:** * **B. Extensor retinaculum:** This is located on the posterior (dorsal) aspect of the wrist. It holds the extensor tendons in place and is divided into six fibro-osseous compartments [1]. * **C. Radial collateral ligament:** This is a stabilizing ligament on the lateral side of the wrist joint, extending from the radial styloid process to the scaphoid and trapezium. * **D. Intercarpal ligaments:** These are short ligaments that connect individual carpal bones to one another to ensure stability within the proximal and distal rows. **High-Yield NEET-PG Pearls:** 1. **Contents of the Carpal Tunnel:** 10 structures pass beneath the TCL—the **Median nerve**, 4 tendons of Flexor Digitorum Superficialis (FDS), 4 tendons of Flexor Digitorum Profundus (FDP), and 1 tendon of Flexor Pollicis Longus (FPL) [1]. 2. **Clinical Correlation:** Compression of the median nerve beneath this ligament leads to **Carpal Tunnel Syndrome**. Surgical treatment involves the "release" (division) of the transverse carpal ligament. 3. **Palmaris Longus:** The tendon of the palmaris longus (if present) passes **superficial** to the flexor retinaculum.

Q: Which muscle is primarily responsible for the abduction of the hand?

Flexor Carpi Radialis (FCR). **Explanation:** The movement of **abduction of the hand** (also known as radial deviation) occurs at the wrist joint. This movement is primarily executed by muscles located on the radial (lateral) side of the forearm. **1. Why Flexor Carpi Radialis (FCR) is correct:** The FCR originates from the medial epicondyle and inserts into the bases of the 2nd and 3rd metacarpals. Due to its lateral insertion point relative to the axis of the wrist, its contraction pulls the hand toward the radius. It acts synergistically with the **Extensor Carpi Radialis Longus (ECRL)** and **Brevis (ECRB)** to produce pure abduction [1]. **2. Why the other options are incorrect:** * **Flexor Carpi Ulnaris (FCU):** This muscle inserts on the pisiform and 5th metacarpal. It is the primary **adductor** (ulnar deviation) of the hand, acting with the Extensor Carpi Ulnaris. * **Flexor Digitorum Profundus (FDP) & Superficialis (FDS):** These are extrinsic muscles primarily responsible for **flexion of the digits** (PIP and DIP joints). While they can assist in weak wrist flexion, they do not contribute significantly to radial or ulnar deviation. **Clinical Pearls for NEET-PG:** * **The "Rule of Synergists":** For pure abduction, a flexor (FCR) and an extensor (ECRL/B) must contract together to cancel out flexion/extension, leaving only the lateral movement. * **Nerve Supply:** FCR is supplied by the **Median Nerve**, whereas FCU is the only forearm flexor (along with the medial half of FDP) supplied by the **Ulnar Nerve**. [1] * **Pulse Point:** The radial artery lies immediately lateral to the tendon of the FCR at the wrist, making the FCR an important anatomical landmark for pulse palpation.

Q: The radial bursa is the synovial sheath covering the tendon of which muscle?

Flexor pollicis longus (FPL). ### Explanation The synovial sheaths of the wrist and palm are designed to reduce friction as the long flexor tendons pass under the flexor retinaculum. **Why the Correct Answer is Right:** The **Radial Bursa** is the proximal continuation of the digital synovial sheath of the thumb. It specifically envelops the tendon of the **Flexor Pollicis Longus (FPL)** [1]. It extends from the neck of the first metacarpal to a point approximately 2.5 cm proximal to the flexor retinaculum. Because the sheath of the thumb is continuous with the radial bursa, infections in the thumb can easily spread proximally into the forearm (Parona’s space). **Analysis of Incorrect Options:** * **Flexor digitorum superficialis (FDS) & Flexor digitorum profundus (FDP):** These eight tendons are collectively enclosed in the **Ulnar Bursa**. While the digital sheaths of the index, middle, and ring fingers are usually separate, the sheath of the little finger is continuous with the ulnar bursa. * **Flexor carpi radialis (FCR):** This tendon has its own dedicated synovial sheath as it passes through a separate compartment in the lateral part of the flexor retinaculum (within the groove of the trapezium) [2]. It is not part of the radial bursa. **High-Yield Clinical Pearls for NEET-PG:** * **Communication:** In about 50-80% of individuals, the radial and ulnar bursae communicate deep to the flexor retinaculum. * **Horseshoe Abscess:** An infection starting in the thumb can spread through the radial bursa, into the ulnar bursa (via the communication), and down to the little finger, forming a "horseshoe-shaped" infection. * **Parona’s Space:** A potential space in the distal forearm between the FDP tendons and the pronator quadratus where infected bursae can rupture.

Q: The skin over the thenar eminence is supplied by which nerve?

Median Nerve. The skin over the **thenar eminence** is supplied by the **Palmar Cutaneous Branch of the Median Nerve**. [1] ### 1. Why the Median Nerve is Correct The median nerve provides sensory innervation to the lateral 3½ digits and the corresponding palm. Specifically, the **palmar cutaneous branch** arises from the median nerve in the distal forearm, proximal to the flexor retinaculum. [1] It passes **superficial** to the carpal tunnel to supply the skin over the thenar eminence and the central palm. [1] ### 2. Why the Other Options are Incorrect * **Radial Nerve:** The superficial branch of the radial nerve supplies the skin of the **lateral half of the dorsum of the hand** and the proximal parts of the lateral 3½ digits. It does not supply the palmar surface. * **Ulnar Nerve:** The ulnar nerve (via its palmar cutaneous branch) supplies the skin over the **hypothenar eminence** and the medial 1½ digits. [1] * **Anterior Interosseous Nerve (AIN):** This is a purely **motor** branch of the median nerve (supplying the deep flexors of the forearm) and provides sensory fibers only to the wrist and intercarpal joints, not the skin. ### 3. Clinical Pearls for NEET-PG * **Carpal Tunnel Syndrome (CTS):** In CTS, there is sensory loss in the lateral 3½ digits, but **sensation over the thenar eminence is spared**. [1] This is because the palmar cutaneous branch passes superficial to the flexor retinaculum and is not compressed within the tunnel. [1] * **Ape Thumb Deformity:** Caused by a proximal median nerve injury, leading to wasting of the thenar muscles. * **Rule of 1½:** The ulnar nerve supplies 1½ muscles in the forearm (FCU and medial half of FDP) and the median nerve supplies the rest. In the hand, the ulnar nerve supplies all intrinsic muscles except the **LOAF** muscles (Lateral 2 Lumbricals, Opponens pollicis, Abductor pollicis brevis, Flexor pollicis brevis), which are median-innervated.

Q: Which of the following statements about the radius bone is true?

It is the lateral bone of the forearm.. The radius is the lateral bone of the forearm, situated on the thumb side in the anatomical position. It is a long bone that plays a pivotal role in the movement of the forearm and the stability of the wrist. **1. Why Option C is correct:** In the standard anatomical position (palms facing forward), the radius is positioned **laterally** (away from the midline), while the ulna is positioned medially. This orientation is fundamental for the mechanics of pronation and supination, where the radius rotates around the relatively fixed ulna. **2. Why the other options are incorrect:** * **Option A:** The **radial groove** (also known as the spiral groove) is a feature of the **humerus**, not the radius. It lodges the radial nerve and the profunda brachii artery. * **Option B:** While the radius is the primary bone forming the wrist joint (radiocarpal joint) by articulating with the scaphoid and lunate, the phrasing "major contributor" can be tricky. However, in the context of basic anatomy, Option C is the most definitive structural fact. (Note: The ulna is excluded from the wrist joint by an articular disc). * **Option D:** The **ulna** is the medial bone of the forearm, not the radius. **Clinical Pearls for NEET-PG:** * **Colles' Fracture:** A common fracture of the distal end of the radius (dinner fork deformity) with posterior displacement. * **Smith's Fracture:** Reverse Colles' fracture with anterior displacement of the distal fragment. * **Pulled Elbow:** Subluxation of the radial head from the **annular ligament**, common in young children. * **Ossification:** The radius is the first long bone to start ossifying in the forearm (8th week of intrauterine life).

Q: A female developed 'pointing index' after an accident. This is due to injury to which nerve?

Median. **Explanation:** The **Median nerve** is the correct answer. The "pointing index" (also known as the **Ochsner’s test** or **Hand of Benediction** when attempting to make a fist) occurs due to a high median nerve injury (at or above the elbow) [1]. **Why it happens:** The median nerve supplies the long flexors of the thumb, index, and middle fingers [1]. Specifically: 1. **Flexor Digitorum Profundus (FDP):** The lateral half (index and middle fingers) is paralyzed [1]. 2. **Flexor Digitorum Superficialis (FDS):** All four tendons are paralyzed. 3. **Flexor Pollicis Longus (FPL):** Paralyzed. When the patient attempts to clench their fist, the ring and little fingers flex (supplied by the ulnar nerve), but the **index finger remains straight** (pointing), and the middle finger flexes only partially [1]. **Analysis of Incorrect Options:** * **Radial Nerve:** Injury leads to **Wrist Drop** and inability to extend the fingers/thumb [1]. It does not affect finger flexion. * **Ulnar Nerve:** Injury leads to **Ulnar Claw Hand** (hyperextension at MCP joints and flexion at IP joints of the ring and little fingers), most prominent at rest. Weakness in abduction and adduction of the index finger is also seen [1]. * **Axillary Nerve:** Injury leads to paralysis of the deltoid and teres minor, resulting in loss of shoulder abduction and "flat shoulder" appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Ape Thumb Deformity:** Seen in low median nerve palsy (wrist level) due to thenar muscle atrophy. * **Ochsner’s Clasping Test:** Used to diagnose high median nerve palsy; the index finger fails to flex. * **Kiloh-Nevin Syndrome:** Injury to the **Anterior Interosseous Nerve** (branch of median) resulting in an inability to make the "OK" sign.

Q: Which muscle of the rotator cuff is often called the 'forgotten muscle'?

Subscapularis. The **Subscapularis** is frequently referred to as the **'forgotten muscle'** of the rotator cuff because its clinical assessment is often overlooked compared to the other three muscles. While the supraspinatus, infraspinatus, and teres minor are located posteriorly and are easily accessible for physical examination and imaging, the subscapularis lies on the anterior surface of the scapula. Its tears are harder to diagnose clinically and were historically missed on standard MRI planes, leading to this moniker. **Analysis of Options:** * **Subscapularis (Correct):** It is the only rotator cuff muscle that originates from the anterior aspect of the scapula and inserts into the **lesser tubercle** of the humerus. It is the most powerful internal rotator of the shoulder. * **Supraspinatus (Incorrect):** This is the **most commonly injured** rotator cuff muscle. It initiates the first 15° of abduction and is tested via the 'Empty Can' (Jobe’s) test. * **Infraspinatus (Incorrect):** Along with the teres minor, it acts as a lateral (external) rotator. It is rarely "forgotten" as it is easily tested by resisted external rotation. * **Teres Minor (Incorrect):** This muscle also provides lateral rotation and is specifically tested using the **Hornblower’s sign**. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** Subscapularis is supplied by the **upper and lower subscapular nerves** (C5, C6). * **Clinical Tests:** Specific tests for the subscapularis include the **Lift-off test** (Gerber’s), **Belly-press test**, and **Bear-hug test**. * **Anatomy:** It forms the posterior wall of the axilla. * **Rotator Interval:** This is a triangular space between the subscapularis and supraspinatus tendons, which houses the long head of the biceps tendon.

Q: The interossei muscles are supplied by which of the following?

Deep palmar arch. The **Deep Palmar Arch** is the primary source of blood supply to the deep structures of the hand, including the interossei muscles. It is formed mainly by the terminal part of the **radial artery**, which anastomoses with the deep palmar branch of the ulnar artery. The arch lies across the bases of the metacarpal bones, deep to the adductor pollicis muscle. It gives off **three palmar metacarpal arteries**, which run distally in the interosseous spaces to supply the interossei muscles and eventually join the common digital arteries. **Analysis of Options:** * **Option A (Superficial palmar branch of radial artery):** This branch arises just before the radial artery enters the back of the hand; it contributes to the superficial palmar arch, primarily supplying the thenar muscles. * **Option B (Deep palmar branch of ulnar artery):** While this branch contributes to the formation of the deep palmar arch, the arch *itself* (as a collective structure) is the direct source of the metacarpal arteries that nourish the interossei. * **Option C (Superficial palmar arch):** Formed mainly by the ulnar artery, it lies superficial to the long flexor tendons and primarily supplies the skin and long flexor tendons via common and proper palmar digital arteries. **High-Yield NEET-PG Pearls:** * **Rule of Thumb:** The **Radial artery** is the main contributor to the **Deep** arch, while the **Ulnar artery** is the main contributor to the **Superficial** arch. * **Nerve Supply:** All interossei (4 dorsal, 3 palmar) are supplied by the **deep branch of the ulnar nerve** (C8, T1) [1]. * **Action:** **PAD-DAB** (Palmar ADduct; Dorsal ABduct) [1]. * **Allen’s Test:** Used clinically to assess the patency of the radial and ulnar arteries and the adequacy of the palmar arches before arterial sampling.

Question 1

All metacarpals of the hand are endowed with one epiphysis each, which is usually located near the head of the metacarpal, except for which one?

Accepted Answer

Thumb metacarpal

Answer

Index metacarpal

Answer

Ring metacarpal

Answer

Middle finger metacarpal

Question 2

The transverse carpal ligament is also known as which of the following?

Accepted Answer

Flexor retinaculum of the hand

Answer

Extensor retinaculum of the hand

Answer

Radial collateral ligament

Answer

Intercarpal ligament

Question 3

Which muscle is primarily responsible for the abduction of the hand?

Accepted Answer

Flexor Carpi Radialis (FCR)

Answer

Flexor Carpi Ulnaris (FCU)

Answer

Flexor Digitorum Profundus (FDP)

Answer

Flexor Digitorum Superficialis (FDS)

Question 4

The radial bursa is the synovial sheath covering the tendon of which muscle?

Accepted Answer

Flexor pollicis longus (FPL)

Answer

Flexor digitorum superficialis (FDS)

Answer

Flexor digitorum profundus (FDP)

Answer

Flexor carpi radialis (FCR)

Question 5

The skin over the thenar eminence is supplied by which nerve?

Accepted Answer

Median Nerve

Answer

Radial Nerve

Answer

Ulnar Nerve

Answer

Anterior Interosseus Nerve

Question 6

Which of the following statements about the radius bone is true?

Accepted Answer

It is the lateral bone of the forearm.

Answer

The radial groove is present.

Answer

It is a major contributor to the wrist joint.

Answer

It is the medial bone of the forearm.

Question 7

Which muscle will be spared in median nerve injury at the elbow?

Accepted Answer

Adductor pollicis longus

Answer

Pronator quadratus

Answer

Abductor pollicis brevis

Answer

Flexor pollicis longus

Question 8

A female developed 'pointing index' after an accident. This is due to injury to which nerve?

Accepted Answer

Median

Answer

Radial

Answer

Ulnar

Answer

Axillary

Question 9

Which muscle of the rotator cuff is often called the 'forgotten muscle'?

Accepted Answer

Subscapularis

Answer

Supraspinatus

Answer

Infraspinatus

Answer

Teres minor

Question 10

The interossei muscles are supplied by which of the following?

Accepted Answer

Deep palmar arch

Answer

Superficial palmar branch of the radial artery

Answer

Deep palmar branch of the ulnar artery

Answer

Superficial palmar arch

Upper Limb — MCQs

Upper Limb — MCQs

On this page

Practice by Chapter

Want unlimited practice?