Upper Limb — MCQs

A teenager is struck on the back of her carpals by a sharp-edged flying wedge while watching her boyfriend split wood. Her extensor digitorum tendons are exposed, though not severed, indicating that the surrounding synovial sheath has been opened. What other muscle has its tendon surrounded by the same synovial sheath?

Q315Easy

Which nerve injury is typically associated with a marked deformity?

Q316Easy

Which muscle is tested by the Card test?

Q317Easy

At the end of 1 year of age, what is the number of carpal bones typically visible on a skiagram of the hand?

Q318Medium

A patient diagnosed with leprosy with ulnar nerve involvement presents with clumsiness of hand. Clumsiness is due to palsy of which of the following muscles?

Q319Easy

The interosseous recurrent artery is a branch of which artery?

Q320Easy

Painful arc syndrome is most commonly caused by a tear of which of the following rotator cuff muscles?

Upper Limb Indian Medical PG Practice Questions and MCQs

Question 311: Which of the following is NOT a feature of anterior interosseous nerve (AIN) syndrome?

A. There is sensory loss on the medial 2 fingers. (Correct Answer)
B. Inability to perform OK-sign (approximate thumb and tip of index finger).
C. AIN is entrapped under pronator teres, flexor digitorum profundus, and flexor carpi radialis.
D. Conservative treatment is generally preferred, with surgery rarely indicated.

Explanation: ### Explanation **1. Why Option A is the Correct Answer (The "False" Statement):** The **Anterior Interosseous Nerve (AIN)** is a **purely motor branch** of the Median nerve. It arises about 5–8 cm distal to the lateral epicondyle and supplies the deep muscles of the forearm. Because it contains no cutaneous sensory fibers, **sensory loss is never a feature** of AIN syndrome [1]. Sensory loss on the medial two fingers would instead suggest Ulnar nerve involvement. **2. Analysis of Other Options:** * **Option B (OK-sign):** The AIN supplies the *Flexor Pollicis Longus (FPL)* and the lateral half of the *Flexor Digitorum Profundus (FDP)* [1]. Paralysis of these muscles prevents flexion of the IP joint of the thumb and the DIP joint of the index finger. When asked to make an "OK" sign, the patient produces a **"pinch" sign** (pulp-to-pulp) instead of a circle (tip-to-tip). * **Option C (Entrapment):** The AIN can be compressed by various structures, most commonly the deep head of the **pronator teres**, the fibrous arch of the **FDS (Flexor Digitorum Superficialis)**, or accessory muscles like Gantzer’s muscle [1]. * **Option D (Treatment):** Most cases are due to neuritis (Parsonage-Turner syndrome) or compression that resolves spontaneously. Therefore, **conservative management** (rest, NSAIDs, splinting) for 3–6 months is the first line of treatment. **3. High-Yield Clinical Pearls for NEET-PG:** * **Muscles supplied by AIN:** Flexor Pollicis Longus (FPL), Pronator Quadratus (PQ), and the lateral half (index and middle finger) of Flexor Digitorum Profundus (FDP) [1]. * **Kiloh-Nevin Syndrome:** Another name for AIN syndrome. * **Differentiating Point:** Unlike Pronator Teres Syndrome (another Median nerve entrapment), AIN syndrome has **no paresthesia** and **no weakness of the thenar muscles** [1]. * **The "Square" Sign:** Weakness of the Pronator Quadratus can be tested by resisting pronation with the elbow flexed.

Question 312: At what age does the radial head ossify?

A. 2 years
B. 4 years (Correct Answer)
C. 6 years
D. 10 years

Explanation: The ossification of the elbow joint is a high-yield topic for NEET-PG, typically remembered using the mnemonic CRITOE, which represents the chronological order of appearance of the secondary ossification centers. 1. Capitellum: 1 year 2. Radial Head: 4 years (Correct Answer) 3. Internal (Medial) Epicondyle: 5–6 years 4. Trochlea: 9–10 years 5. Olecranon: 10 years 6. External (Lateral) Epicondyle: 11–12 years Why Option B is correct: The secondary ossification center for the head of the radius typically appears at 4 years of age (range 3–5 years). It eventually fuses with the shaft of the radius at puberty (approximately 15–17 years). Analysis of Incorrect Options: * Option A (2 years): At this age, only the capitellum is usually visible. The radial head has not yet begun to ossify. * Option C (6 years): By age 6, the medial epicondyle has usually appeared. While the radial head is visible on X-ray by this time, it first appears earlier, at age 4. * Option D (10 years): This age corresponds to the appearance of the trochlea and the olecranon process. Clinical Pearls for NEET-PG: * CRITOE Mnemonic: Always remember the sequence 1-3-5-7-9-11 (approximate ages in years) to identify elbow ossification centers on pediatric X-rays. * Pulled Elbow (Nursemaid’s Elbow): This involves subluxation of the radial head through the annular ligament, common in children aged 1–4 years (before the radial head is fully formed and ossified). * Fracture Identification: Knowledge of these ages is crucial to avoid mistaking a normal ossification center for an avulsion fracture in pediatric trauma cases.

Question 313: Which of the following structures is intracapsular?

A. Anterior head of biceps brachii
B. Medial head of triceps brachii
C. Long head of triceps brachii
D. Long head of biceps brachii (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Long head of biceps brachii.** The shoulder joint (glenohumeral joint) is unique because the tendon of the **long head of the biceps brachii** originates from the supraglenoid tubercle of the scapula, which is located inside the joint capsule. Therefore, the tendon is **intracapsular but extrasynovial** (it is excluded from the synovial cavity by a reflection of the synovial membrane). It exits the joint through the bicipital groove, held in place by the transverse humeral ligament. **Analysis of Incorrect Options:** * **A. Anterior head of biceps brachii:** There is no "anterior head"; the biceps has a long head and a short head. The short head originates from the coracoid process, which is entirely extracapsular. * **B & C. Medial and Long heads of triceps brachii:** The triceps is located in the posterior compartment of the arm. While the long head originates from the infraglenoid tubercle (just below the glenoid cavity), it remains **extracapsular**. The medial head originates from the posterior surface of the humerus, far from the joint capsule. **High-Yield Clinical Pearls for NEET-PG:** * **Intracapsular Structures:** Other high-yield examples include the **Popliteus tendon** in the knee joint and the **Ligamentum teres** in the hip joint. * **Bicipital Tendonitis:** Inflammation of the long head of the biceps often presents as pain in the anterior aspect of the shoulder, aggravated by supination against resistance (Yergason’s test). * **Synovial Communication:** The synovial sheath of the long head of the biceps is continuous with the glenohumeral joint cavity, allowing infections or effusions to track along the tendon.

Question 314: A teenager is struck on the back of her carpals by a sharp-edged flying wedge while watching her boyfriend split wood. Her extensor digitorum tendons are exposed, though not severed, indicating that the surrounding synovial sheath has been opened. What other muscle has its tendon surrounded by the same synovial sheath?

A. Extensor carpi radialis brevis
B. Extensor carpi radialis longus
C. Extensor digiti minimi
D. Extensor indicis (Correct Answer)

Explanation: ### Explanation The key to solving this question lies in understanding the **Extensor Compartments of the Wrist**. The extensor tendons pass deep to the extensor retinaculum, where they are organized into six distinct osteofascial compartments, each lined by a synovial sheath to reduce friction. **The Correct Answer: D. Extensor indicis** The **fourth compartment** of the wrist contains five tendons: the four tendons of the **Extensor Digitorum (ED)** and the single tendon of the **Extensor Indicis (EI)**. Because they share the same anatomical space and are enclosed within a single, common synovial sheath, an injury that opens the sheath of the extensor digitorum will inherently involve the sheath of the extensor indicis. **Analysis of Incorrect Options:** * **A & B (ECRB and ECRL):** These tendons are located in the **second compartment** [1]. They have their own separate synovial sheath and are separated from the fourth compartment by the dorsal tubercle of the radius (Lister’s tubercle). * **C (Extensor digiti minimi):** This tendon is located in the **fifth compartment**, situated just superficial to the distal radioulnar joint. It possesses its own independent synovial sheath. **NEET-PG High-Yield Pearls:** * **Compartment 1:** Abductor pollicis longus & Extensor pollicis brevis (Involved in De Quervain’s Tenosynovitis) [1]. * **Compartment 2:** ECRL & ECRB [1]. * **Compartment 3:** Extensor pollicis longus (Loops around Lister’s tubercle). * **Compartment 4:** ED & EI (Shared sheath). * **Compartment 5:** Extensor digiti minimi. * **Compartment 6:** Extensor carpi ulnaris. * **Mnemonic:** "2-2-1-5-1-1" (Number of tendons in compartments 1 through 6).

Question 315: Which nerve injury is typically associated with a marked deformity?

A. Radial nerve (Correct Answer)
B. Posterior interosseous nerve
C. Ulnar nerve
D. Median nerve

Explanation: The correct answer is **Radial nerve** because its injury results in **Wrist Drop**, which is considered a "marked" or "complete" deformity due to the total loss of extension at the wrist, thumb, and metacarpophalangeal joints. [1] ### Why Radial Nerve is Correct The radial nerve (C5-T1) supplies all the extensors of the forearm. A high radial nerve palsy (e.g., in the spiral groove or axilla) leads to the inability to extend the wrist against gravity [1]. This creates a dramatic, visible deformity where the hand hangs flaccidly in flexion, significantly impacting the patient's ability to grip objects (as a stable, extended wrist is required for an effective grip). ### Explanation of Incorrect Options * **Posterior Interosseous Nerve (PIN):** While this is a branch of the radial nerve, its injury causes **Finger Drop** but **not** Wrist Drop. The Extensor Carpi Radialis Longus (ECRL) is spared because it is supplied by the radial nerve *before* it bifurcates, allowing the patient to still extend the wrist (often with radial deviation). * **Ulnar Nerve:** Injury leads to "Claw Hand" (main en griffe). While characteristic, it primarily affects the ring and little fingers and is often described as a "partial" claw unless combined with median nerve injury [1]. * **Median Nerve:** Injury leads to "Ape Thumb" deformity or "Hand of Benediction" (when attempting to make a fist) [1]. While functionally limiting, these are often less "marked" in a resting neutral position compared to the total collapse seen in wrist drop. ### High-Yield Clinical Pearls for NEET-PG * **Saturday Night Palsy:** Radial nerve compression in the axilla. * **Humerus Shaft Fracture:** Most common site for radial nerve injury [1]. * **Holstein-Lewis Fracture:** Spiral fracture of the distal 1/3 of the humerus specifically associated with radial nerve palsy. * **Rule of Thumb:** If the patient can extend the wrist but not the fingers, think PIN; if they cannot extend either, think Radial Nerve.

Question 316: Which muscle is tested by the Card test?

A. Abductor pollicis brevis
B. Dorsal interossei
C. Palmar interossei (Correct Answer)
D. Adductor pollicis

Explanation: The **Card test** is a clinical assessment used to evaluate the integrity of the **ulnar nerve**, specifically testing the strength of the **Palmar interossei** muscles. [1] ### 1. Why Palmar Interossei is Correct The Palmar interossei are responsible for **adduction** of the fingers (PAD: Palmar ADduct). During the Card test, a piece of paper or a card is placed between the patient’s extended fingers. The patient is asked to grip the card tightly by adducting their fingers while the examiner attempts to pull it away. If the Palmar interossei are weak or paralyzed (as seen in ulnar nerve palsy), the patient cannot maintain a firm grip, and the card is easily withdrawn. [1] ### 2. Why Other Options are Incorrect * **Abductor pollicis brevis:** Tested by asking the patient to abduct the thumb perpendicular to the palm against resistance. It is supplied by the **Median nerve**. [1] * **Dorsal interossei:** These muscles **abduct** the fingers (DAB: Dorsal ABduct). They are tested by the **Egawa test**, where the patient is asked to move their middle finger side-to-side or abduct fingers against resistance. [1] * **Adductor pollicis:** While supplied by the ulnar nerve, it is tested using **Froment’s sign**. A patient with ulnar nerve palsy will flex the thumb at the IP joint (using the Flexor Pollicis Longus) to hold a piece of paper because they cannot adduct the thumb. ### 3. Clinical Pearls for NEET-PG * **Ulnar Nerve:** Known as the "Musician’s Nerve" because it controls most fine intrinsic movements of the hand. * **Wartenberg’s Sign:** Inability to adduct the little finger due to weakness of the 3rd palmar interosseous muscle. * **Point of Origin:** Palmar interossei are unipennate; Dorsal interossei are bipennate. * **Mnemonic:** **PAD** (Palmar Adduct) and **DAB** (Dorsal Adduct).

Question 317: At the end of 1 year of age, what is the number of carpal bones typically visible on a skiagram of the hand?

A. None
B. One
C. Two (Correct Answer)
D. Three

Explanation: **Explanation:** The ossification of carpal bones follows a predictable chronological sequence, making them excellent indicators for assessing skeletal maturity (bone age) in pediatric patients. At birth, the carpal bones are entirely cartilaginous and therefore not visible on a radiograph (skiagram). **Why Option C is correct:** The carpal bones ossify in a clockwise or counter-clockwise direction starting from the **Capitate**, followed by the **Hamate**. * **Capitate:** Typically appears at **1–3 months**. * **Hamate:** Typically appears at **2–4 months**. By the end of the 1st year, these are the only two carpal bones that have usually undergone sufficient ossification to be visible on an X-ray. **Analysis of Incorrect Options:** * **A. None:** Incorrect, as the Capitate and Hamate ossify within the first few months of life. * **B. One:** Incorrect, as both the Capitate and Hamate are visible by 6 months of age. * **D. Three:** Incorrect, as the third bone (**Triquetral**) typically appears at **2–3 years** of age. **NEET-PG High-Yield Facts:** 1. **Sequence of Ossification:** Remember the mnemonic "**C**apitate, **H**amate, **T**riquetral, **L**unate, **S**caphoid, **T**rapezium, **T**rapezoid, **P**isiform" (roughly follows the age in years, except for the last few). 2. **Order of Appearance:** * 1 year: 2 bones (Capitate, Hamate) * 3 years: 3 bones (Triquetral) * 4 years: 4 bones (Lunate) * 5 years: 5-6 bones (Scaphoid, Trapezium, Trapezoid) * 12 years: 8 bones (Pisiform is the last to ossify). 3. **Clinical Pearl:** The **Capitate** is the first carpal bone to ossify, while the **Pisiform** (a sesamoid bone) is the last. Bone age is usually determined by an X-ray of the **left hand and wrist**.

Question 318: A patient diagnosed with leprosy with ulnar nerve involvement presents with clumsiness of hand. Clumsiness is due to palsy of which of the following muscles?

A. Extensor carpi ulnaris
B. Abductor pollicis brevis
C. Opponens pollicis
D. Interosseous muscle (Correct Answer)

Explanation: The ulnar nerve is often referred to as the **"Musician’s Nerve"** because it controls the fine, coordinated movements of the fingers. The "clumsiness" of the hand in ulnar nerve palsy—common in leprosy—is primarily due to the paralysis of the **Interosseous muscles** (both dorsal and palmar). **Why Interossei are the cause:** The interossei are responsible for abduction (DAB) and adduction (PAD) of the fingers [1]. More importantly, they work with the lumbricals to perform the "Z-movement" (flexion at MCP joints and extension at IP joints). Loss of these muscles results in a loss of fine motor control, weakness in grip, and the inability to perform intricate tasks, leading to clinical clumsiness. **Analysis of Incorrect Options:** * **Extensor carpi ulnaris (A):** Supplied by the **Posterior Interosseous Nerve** (a branch of the Radial nerve). Its palsy leads to weak wrist extension and radial deviation, not finger clumsiness. * **Abductor pollicis brevis (B) & Opponens pollicis (C):** These are **Thenar muscles** supplied by the **Median nerve** [1]. Their involvement (e.g., in Carpal Tunnel Syndrome) leads to loss of thumb opposition and abduction ("Ape thumb deformity"), rather than generalized finger clumsiness. **High-Yield Clinical Pearls for NEET-PG:** * **Ulnar Paradox:** The higher the lesion (at the elbow), the less prominent the clawing, because the medial half of the Flexor Digitorum Profundus (FDP) is also paralyzed. * **Froment’s Sign:** Tests for Adductor Pollicis (ulnar nerve) palsy; the patient flexes the thumb IP joint (using the Median nerve's FPL) to grip paper. * **Wartenberg’s Sign:** Inability to adduct the little finger due to palmar interosseous weakness.

Question 319: The interosseous recurrent artery is a branch of which artery?

A. Anterior interosseous artery
B. Posterior interosseous artery (Correct Answer)
C. Common interosseous artery
D. Radial artery

Explanation: **Explanation:** The **interosseous recurrent artery** is a key vessel involved in the arterial anastomosis around the elbow joint. It arises from the **posterior interosseous artery** (a branch of the common interosseous artery) near its origin. It ascends posteriorly to the lateral epicondyle of the humerus, where it anastomoses with the middle collateral artery (a branch of the profunda brachii). **Analysis of Options:** * **Posterior Interosseous Artery (Correct):** This artery passes backward between the radius and ulna. Its first major branch is the interosseous recurrent artery, which travels upward to participate in the elbow anastomosis. * **Anterior Interosseous Artery:** This artery travels down the anterior surface of the interosseous membrane. While it pierces the membrane to join the posterior compartment near the wrist, it does not give off the recurrent branch at the elbow. * **Common Interosseous Artery:** This is a short branch of the ulnar artery that divides into the anterior and posterior interosseous arteries. While it is the "parent" vessel, the recurrent branch specifically originates from the posterior division. * **Radial Artery:** The radial artery gives off the **radial recurrent artery**, which anastomoses with the radial collateral artery. It is distinct from the interosseous system. **High-Yield Facts for NEET-PG:** * **Elbow Anastomosis Rule:** Remember that "Recurrent" arteries (from below) meet "Collateral" arteries (from above). * **Middle Collateral Artery:** This is the specific partner for the interosseous recurrent artery. * **Common Interosseous Artery:** It is a branch of the **Ulnar Artery**, not the radial artery. * **Posterior Interosseous Nerve (PIN):** While the artery passes *above* the interosseous membrane, the PIN (deep branch of radial nerve) passes through the supinator muscle to enter the posterior compartment.

Question 320: Painful arc syndrome is most commonly caused by a tear of which of the following rotator cuff muscles?

A. Deltoid
B. Supraspinatus (Correct Answer)
C. Trapezius
D. Pectoralis major

Explanation: **Explanation:** **Painful Arc Syndrome** (also known as Subacromial Impingement Syndrome) is characterized by shoulder pain during the middle range of abduction, typically between **60° and 120°**. **Why Supraspinatus is correct:** The Supraspinatus muscle is the most frequently injured component of the rotator cuff. It passes through the narrow subacromial space, beneath the acromion process and the coracoacromial ligament. During abduction, the tendon is compressed against the acromion. If the tendon is inflamed, degenerated, or torn, this compression causes sharp pain specifically in the 60°–120° range. Below 60°, the tendon hasn't yet contacted the acromion; above 120°, the greater tuberosity rotates away, relieving the pressure. **Why other options are incorrect:** * **Deltoid:** While the deltoid is the primary abductor of the arm (after the first 15°), it is a superficial muscle and not part of the rotator cuff. It is rarely the primary cause of impingement. * **Trapezius:** This muscle acts on the scapula (rotation and elevation) rather than the glenohumeral joint directly. * **Pectoralis Major:** This is a powerful adductor and internal rotator of the humerus; it does not contribute to the rotator cuff or the painful arc mechanism. **NEET-PG High-Yield Pearls:** * **Rotator Cuff Muscles (SITS):** Supraspinatus, Infraspinatus, Teres minor, and Subscapularis. * **Initiation of Abduction:** Supraspinatus initiates the first 0–15°. * **Nerve Supply:** Supraspinatus is supplied by the **Suprascapular nerve (C5, C6)**. * **Neer’s Test and Hawkins-Kennedy Test:** Clinical exams used to identify subacromial impingement. * **Critical Zone:** The area of the supraspinatus tendon with poor blood supply (Codman’s point), making it prone to degenerative tears.

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Nerves of Upper Limb

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Arterial Supply and Venous Drainage

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Muscles and Their Actions

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Upper Limb — MCQs

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