Upper Limb — MCQs

Upper Limb Indian Medical PG Practice Questions and MCQs

Question 281: Which of the following statements is false regarding the clavicle?

A. Ossifies in membrane
B. Is a horizontal bone
C. The most common site of fracture is the junction of the medial third with the lateral two-thirds (Correct Answer)
D. Has no medullary cavity

Explanation: The clavicle is a unique bone with several "firsts" and "onlys" that make it a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** **Option C is False.** The most common site of fracture for the clavicle is the **junction of the medial two-thirds and the lateral one-third**. This is the weakest point of the bone because it is where the curvature changes (from convex anteriorly to concave anteriorly) and where the cross-section changes from cylindrical (medial) to flattened (lateral). The option incorrectly swaps these proportions. ### **Analysis of Incorrect Options** * **Option A (True):** The clavicle is the **first bone in the body to ossify**. Unlike most long bones, it undergoes **intramembranous ossification** (except for its medial end, which ossifies endochondrally later) [1]. * **Option B (True):** It is the only long bone in the human body that lies **horizontally**. * **Option D (True):** Unlike typical long bones, the clavicle **lacks a well-defined medullary (marrow) cavity** [2]. It consists mainly of cancellous bone surrounded by a compact bone shell. ### **High-Yield Clinical Pearls for NEET-PG** * **Ossification:** It has two primary centers of ossification (appearing between the 5th–6th week of intrauterine life). * **Transmission of Force:** It transmits the weight of the upper limb to the axial skeleton via the **coracoclavicular ligament** [2] and the sternoclavicular joint. * **Clinical Presentation:** In a typical fracture, the medial fragment is displaced upward by the **sternocleidomastoid** muscle, while the lateral fragment drops due to the weight of the arm. * **Nerve Relation:** The **supraclavicular nerves** pierce the bone occasionally, and the **subclavian vessels/brachial plexus** lie deep to its medial third.

Question 282: Which of the following is NOT an abductor of the shoulder?

A. Deltoid
B. Trapezius
C. Supraspinatus
D. Latissimus dorsi (Correct Answer)

Explanation: The shoulder joint (glenohumeral joint) relies on a coordinated sequence of muscle contractions, known as the **scapulohumeral rhythm**, to achieve abduction. ### **Why Latissimus Dorsi is the Correct Answer** The **Latissimus dorsi** is primarily an **adductor**, internal rotator, and extensor of the humerus (often called the "climbing muscle"). Because it inserts into the floor of the bicipital groove of the humerus from a medial and inferior origin, its contraction pulls the arm toward the midline, directly opposing abduction. ### **Analysis of Other Options (Abductors)** * **Supraspinatus (Option C):** Initiates the first **0–15 degrees** of abduction. It stabilizes the humeral head in the glenoid cavity. * **Deltoid (Option A):** The multipennate middle fibers are the primary abductors from **15–90 degrees**. * **Trapezius (Option B):** Along with the Serratus anterior, the Trapezius facilitates abduction **beyond 90 degrees** by rotating the scapula upward, allowing the glenoid cavity to face superiorly. ### **High-Yield NEET-PG Pearls** * **The "15-Degree" Rule:** 0–15° = Supraspinatus; 15–90° = Deltoid; >90° = Serratus anterior & Trapezius. * **Nerve Supply:** Latissimus dorsi is supplied by the **Thoracodorsal nerve** (C6, C7, C8). Injury to this nerve results in difficulty performing activities like pull-ups or using crutches. * **Rotator Cuff:** The Supraspinatus is the most commonly injured muscle in rotator cuff tears, leading to pain and inability to initiate abduction. * **The "Lady" between two "Majors":** A common mnemonic for the bicipital groove—**L**atissimus dorsi (Lady) inserts between Pectoralis **major** and Teres **major**.

Question 283: All of the following are associated with pronator syndrome, except?

A. Struthers ligament
B. Bicipital aponeurosis
C. Pronator quadratus (Correct Answer)
D. Flexor digitorum superficialis (FDS)

Explanation: ### Explanation **Pronator Syndrome** is a compressive neuropathy of the **median nerve** as it passes through the proximal forearm. To answer this question, one must identify the specific anatomical structures that form potential compression sites along the nerve's course. #### Why Pronator Quadratus is the Correct Answer The **Pronator Quadratus** is located in the distal forearm. While it is innervated by the Anterior Interosseous Nerve (a branch of the median nerve), it does not form a potential site for entrapment in Pronator Syndrome [1]. Compression at this distal level would typically involve the Anterior Interosseous Nerve (AIN) syndrome, which presents with motor deficits but no sensory loss in the palm [1]. #### Analysis of Other Options (Potential Compression Sites) * **Struthers Ligament (Option A):** A fibrous band extending from a supracondylar process of the humerus to the medial epicondyle. It is the most proximal site where the median nerve can be compressed. * **Bicipital Aponeurosis (Option B):** Also known as the *lacertus fibrosus*, this thickened fascia can compress the nerve as it crosses the cubital fossa. * **Flexor Digitorum Superficialis (Option D):** The median nerve passes deep to the fibrous arch (sublimis bridge) formed by the two heads of the FDS. This is a common site of entrapment [1]. * **Pronator Teres (Not listed but implied):** The nerve typically passes between the humeral and ulnar heads of this muscle [1]. #### Clinical Pearls for NEET-PG * **Clinical Presentation:** Patients present with aching pain in the proximal forearm and **paresthesia** in the median nerve distribution of the hand [1]. * **Differentiating from Carpal Tunnel Syndrome (CTS):** In Pronator Syndrome, there is sensory loss over the **thenar eminence** (due to involvement of the palmar cutaneous branch, which arises proximal to the carpal tunnel) [1]. In CTS, the thenar eminence sensation is usually spared [2]. * **Motor Sign:** Weakness may be present, but the "Hand of Benediction" is more common in higher supracondylar injuries.

Question 284: Allen's test detects insufficiency of which artery?

A. Radial artery (Correct Answer)
B. Umbilical artery
C. Popliteal artery
D. Aorta

Explanation: **Explanation:** **Allen’s Test** is a clinical bedside procedure used to assess the **collateral circulation** of the hand. It specifically evaluates the patency of the **radial and ulnar arteries** and the integrity of the palmar arches. [1] 1. **Why Radial Artery is Correct:** Before performing procedures like arterial blood gas (ABG) sampling or radial artery cannulation, it is vital to ensure that the ulnar artery can sufficiently supply the hand if the radial artery becomes occluded. [1] In the test, both arteries are compressed while the patient makes a fist. When the ulnar pressure is released, the hand should "flush" (return to a pink color) within 5–15 seconds. If it remains pale, it indicates **radial or ulnar artery insufficiency** or an incomplete palmar arch. [1] 2. **Why Incorrect Options are Wrong:** * **Umbilical artery:** Located in the pelvis/umbilical cord; assessed via Doppler ultrasound in obstetrics, not a manual compression test. * **Popliteal artery:** Located behind the knee; insufficiency is assessed via the Popliteal pulse or Ankle-Brachial Index (ABI). * **Aorta:** The main systemic artery; insufficiency (regurgitation) is assessed via auscultation and echocardiography. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Allen’s Test:** This is the version most commonly used in clinical practice today (testing one artery at a time). * **Surface Anatomy:** The radial artery lies lateral to the tendon of the **Flexor Carpi Radialis (FCR)** at the wrist. * **Clinical Indication:** Mandatory before harvesting the radial artery for **Coronary Artery Bypass Grafting (CABG)**. * **Normal Refill Time:** A positive (normal) test shows reperfusion within **7 seconds**. Beyond 15 seconds is considered abnormal.

Question 285: Which structure is intracapsular but extrasynovial?

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

Explanation: The **Long Head of the Biceps Brachii (LHBB)** is a unique anatomical structure in the shoulder joint. It originates from the supraglenoid tubercle of the scapula, which is located inside the fibrous capsule of the glenohumeral joint. However, as the tendon passes through the joint, the synovial membrane reflects around it, forming a tubular sheath. This means the tendon is physically located within the joint capsule (**intracapsular**) but is excluded from the synovial cavity by this membrane (**extrasynovial**). **Analysis of Options:** * **Long head of biceps (Correct):** It remains extrasynovial to prevent friction and maintain a sterile environment within the synovial fluid while traversing the joint to reach the bicipital groove. * **Long head of triceps:** This originates from the infraglenoid tubercle of the scapula. It is entirely **extracapsular** and does not enter the shoulder joint. * **Short head of biceps:** This originates from the tip of the coracoid process. It is an **extracapsular** structure. * **Medial head of biceps:** This is a **distractor**; the biceps brachii only has two heads (long and short). The triceps has a medial head, but it originates from the posterior surface of the humerus, far from the joint capsule. **High-Yield Clinical Pearls for NEET-PG:** * **Other Intracapsular, Extrasynovial structures:** The **Popliteus tendon** in the knee joint and the **Ligamentum teres** in the hip joint follow the same principle. * **Bicipital Groove:** The LHBB is held in the intertubercular sulcus by the transverse humeral ligament. * **SLAP Lesion:** Injuries to the superior labrum where the LHBB attaches are high-yield clinical correlations.

Question 286: All of the following bones form the proximal row of carpal bones except?

A. Lunate
B. Piriformis
C. Trapezium (Correct Answer)
D. Scaphoid

Explanation: The carpal bones are organized into two rows: **Proximal** and **Distal**. Understanding this arrangement is fundamental for solving upper limb anatomy questions in NEET-PG. ### **Explanation of the Correct Answer** **C. Trapezium:** This is the correct answer because the Trapezium belongs to the **distal row** of carpal bones, not the proximal row. It is the most lateral bone of the distal row and articulates with the first metacarpal to form the thumb's saddle joint. ### **Analysis of Incorrect Options** The proximal row consists of four bones (lateral to medial): * **D. Scaphoid:** The most lateral bone of the proximal row; it is the most commonly fractured carpal bone. * **A. Lunate:** Located between the scaphoid and triquetrum; it is the most commonly dislocated carpal bone. * **Triquetrum:** A pyramidal bone located medially. * **B. Pisiform:** A sesamoid bone (within the Flexor Carpi Ulnaris tendon) that sits on the anterior surface of the triquetrum. Note: The option "Piriformis" in the question is likely a distractor or typo for "Pisiform," as Piriformis is a muscle of the gluteal region. ### **High-Yield Clinical Pearls for NEET-PG** * **Mnemonic:** "She Looks Too Pretty, Try To Catch Her" (Scaphoid, Lunate, Triquetrum, Pisiform / Trapezium, Trapezoid, Capitate, Hamate). * **Scaphoid Fracture:** Characterized by tenderness in the **Anatomical Snuffbox**. Risk of avascular necrosis due to retrograde blood supply. * **Lunate Dislocation:** May compress the **Median Nerve** within the carpal tunnel. * **Capitate:** The largest carpal bone and the first to begin ossification. * **Pisiform:** The last carpal bone to ossify.

Question 287: Which nerve is involved in Guyon's canal syndrome?

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

Explanation: **Explanation:** **Guyon’s Canal Syndrome** (also known as Ulnar Tunnel Syndrome) is a compression neuropathy caused by the entrapment of the **ulnar nerve** as it passes through Guyon’s canal at the wrist. **1. Why the Ulnar Nerve is Correct:** Guyon’s canal is an anatomical fibro-osseous tunnel located on the medial (ulnar) side of the wrist [1]. Its boundaries include the **pisiform bone** medially, the **hook of the hamate** laterally, and the **volar carpal ligament** forming the roof. The ulnar nerve and ulnar artery pass through this space [1]. Compression here typically results from repetitive trauma (e.g., "handlebar palsy" in cyclists) or ganglion cysts, leading to sensory loss in the medial 1.5 fingers and weakness of the intrinsic hand muscles. **2. Why Other Options are Incorrect:** * **Median Nerve:** This nerve passes through the **carpal tunnel** [1]. Compression here leads to Carpal Tunnel Syndrome, affecting the lateral 3.5 fingers and the thenar muscles [1]. * **Radial Nerve:** This nerve primarily supplies the posterior compartment of the arm and forearm. Compression of its superficial branch at the wrist is known as **Wartenberg’s Syndrome**, causing sensory loss on the dorsal-lateral hand. * **Axillary Nerve:** This nerve arises from the posterior cord of the brachial plexus and winds around the surgical neck of the humerus. It is not related to the wrist or hand anatomy. **Clinical Pearls for NEET-PG:** * **Handlebar Palsy:** A classic clinical scenario for Guyon’s canal syndrome in long-distance cyclists. * **Sparing of Sensation:** Unlike ulnar nerve lesions at the elbow (Cubital Tunnel), sensation to the **dorsal** medial 1.5 fingers is often **preserved** in Guyon's canal syndrome because the dorsal cutaneous branch of the ulnar nerve arises proximal to the wrist. * **Froment’s Sign:** Positive in ulnar nerve palsy due to adductor pollicis paralysis.

Question 288: The palmar interossei are supplied by which nerve branch?

A. Superficial branch of the ulnar nerve
B. Deep branch of the ulnar nerve (Correct Answer)
C. Superficial branch of the median nerve
D. Radial nerve

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The **deep branch of the ulnar nerve** is the primary motor nerve of the hand. After passing through Guyon’s canal, it pierces the muscles of the hypothenar eminence and curves across the palm, following the deep palmar arch. It supplies all the **interossei** (both 3-4 palmar and 4 dorsal), the two medial lumbricals, the hypothenar muscles, and the adductor pollicis [2]. The palmar interossei are responsible for **adducting** the fingers (PAD) toward the midline of the hand [2]. **2. Why the Incorrect Options are Wrong:** * **Superficial branch of the ulnar nerve:** This branch is primarily sensory, supplying the skin of the medial 1.5 fingers. Its only motor contribution is to the **Palmaris brevis** muscle [2]. * **Superficial branch of the median nerve:** This is a purely sensory branch (Palmar cutaneous branch) that supplies the skin over the lateral aspect of the palm [1]. The median nerve's motor supply in the hand is limited to the **LOAF** muscles (Lateral two lumbricals, Opponens pollicis, Abductor pollicis brevis, and Flexor pollicis brevis) [2]. * **Radial nerve:** The radial nerve (via the posterior interosseous nerve) supplies the extensors in the forearm [3]. It provides **no motor supply** to the intrinsic muscles of the hand. **3. High-Yield Clinical Pearls for NEET-PG:** * **PAD & DAB:** Remember **P**almar **AD**duct (3 muscles) and **D**orsal **AB**duct (4 muscles). * **Ulnar Paradox:** The higher the lesion of the ulnar nerve, the less prominent the clawing (because the long flexors are also paralyzed). * **Froment’s Sign:** Tests for **Adductor pollicis** palsy (ulnar nerve). If weak, the patient compensates by flexing the thumb at the IP joint using the median nerve (Flexor pollicis longus). * **Egawa’s Test:** Tests the **Dorsal interossei** by asking the patient to side-to-side (abduct) the middle finger.

Question 289: Which of the following movements is NOT caused by the deltoid muscle?

A. Flexion of the shoulder
B. Extension of the shoulder
C. Internal rotation of the shoulder
D. Adduction of the shoulder (Correct Answer)

Explanation: The **Deltoid muscle** is a multipennate muscle that acts as the primary mover of the shoulder joint. Its function is best understood by dividing it into three distinct sets of fibers: anterior, middle, and posterior. ### Why Adduction is the Correct Answer **Adduction of the shoulder** is the correct answer because the deltoid is primarily an **abductor**. The middle fibers of the deltoid are the chief abductors of the arm from 15° to 90°. Adduction is instead performed by muscles like the Pectoralis major, Latissimus dorsi, and Teres major. ### Analysis of Other Options * **Flexion (Option A):** The **anterior (clavicular) fibers** of the deltoid are responsible for flexion and medial rotation of the humerus. * **Extension (Option B):** The **posterior (spinous) fibers** act as antagonists to the anterior fibers, producing extension and lateral rotation. * **Internal Rotation (Option C):** Along with flexion, the **anterior fibers** assist in internal (medial) rotation of the shoulder. ### High-Yield Clinical Pearls for NEET-PG * **The 0-15-90 Rule:** Abduction is initiated by the **Supraspinatus** (0–15°), continued by the **Deltoid** (15–90°), and completed above 90° by the **Serratus anterior** and **Trapezius** (via scapular rotation). * **Nerve Supply:** The deltoid is supplied by the **Axillary nerve (C5, C6)**. Damage to this nerve (often via surgical neck of humerus fractures or shoulder dislocation) leads to loss of shoulder contour and inability to abduct the arm. * **Intramuscular Injection:** The deltoid is a common site for IM injections; the needle is typically aimed at the middle of the muscle to avoid the axillary nerve.

Question 290: Which of the following is false regarding Klumpke's paralysis?

A. Involves the lower trunk of the brachial plexus.
B. Can be caused by undue abduction of the shoulder.
C. Can present with Horner's syndrome.
D. Results in paralysis of the biceps brachii. (Correct Answer)

Explanation: Explanation: Klumpke’s paralysis is a lower brachial plexus injury involving the **C8 and T1 nerve roots**. To identify the false statement, one must understand the functional anatomy of these roots versus the upper trunk. **1. Why Option D is the Correct (False) Statement:** The **biceps brachii** is innervated by the **musculocutaneous nerve (C5, C6, C7)**. Since Klumpke’s paralysis specifically affects the lower roots (C8-T1), the biceps remains functional. Paralysis of the biceps is a hallmark of **Erb’s palsy** (Upper Trunk injury), not Klumpke’s. **2. Analysis of Other Options:** * **Option A (True):** Klumpke’s specifically involves the **lower trunk** (C8-T1). * **Option B (True):** The mechanism of injury is **hyperabduction** of the arm (e.g., clutching an object while falling from a height or a breech delivery with an extended arm). This stretches the lower roots against the coracoid process. * **Option C (True):** The T1 root carries preganglionic sympathetic fibers to the head and neck. Damage to T1 can disrupt these fibers, leading to **Horner’s syndrome** (miosis, ptosis, and anhidrosis). **Clinical Pearls for NEET-PG:** * **The

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Upper Limb — MCQs

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