Upper Limb Practice Questions

Q: Posterior interosseous artery is a branch of?

Common interosseous artery. ***Common interosseous artery*** - The **common interosseous artery** is a short branch of the **ulnar artery** that quickly divides into the anterior and posterior interosseous arteries. - The **posterior interosseous artery** then supplies muscles in the posterior compartment of the forearm. *Radial artery* - The **radial artery** is one of the two terminal branches of the **brachial artery** and primarily supplies the lateral side of the forearm and hand. - It does not directly give off the posterior interosseous artery. *Median artery* - The **median artery** is a small artery that runs with the **median nerve** and is often a branch of the **anterior interosseous artery**. - It does not give rise to the posterior interosseous artery itself. *Brachial artery* - The **brachial artery** is the main artery of the upper arm, branching into the **radial** and **ulnar arteries** in the forearm. - While it's an upstream vessel, it does not directly give off the posterior interosseous artery; that branch comes from the common interosseous artery, which is a branch of the ulnar artery.

Q: Coracohumeral ligament inserts on?

Lesser and greater tuberosities. ***Lesser and greater tuberosities*** - The **coracohumeral ligament** originates from the **lateral border of the coracoid process** and inserts onto **both the greater and lesser tuberosities** of the humerus. - It divides into two bands: one inserts on the **greater tuberosity** and the other on the **lesser tuberosity**, effectively bridging across the **bicipital groove**. - This ligament strengthens the **superior part of the joint capsule** and limits inferior translation and external rotation of the humeral head. *Greater tuberosity* - While the coracohumeral ligament does insert partially on the **greater tuberosity**, this option is incomplete as it omits the insertion on the **lesser tuberosity** as well. - The greater tuberosity also serves as the attachment site for **supraspinatus**, **infraspinatus**, and **teres minor** muscles (rotator cuff). *Bicipital groove* - The **bicipital groove** (intertubercular sulcus) houses the **long head of the biceps tendon**. - The **transverse humeral ligament** spans this groove, holding the biceps tendon in place. - The coracohumeral ligament bridges across the groove but does not insert into it. *Anatomical neck of humerus* - The **anatomical neck** is the constriction below the humeral head, representing the old epiphyseal line. - The **joint capsule** attaches to the anatomical neck, but the coracohumeral ligament specifically inserts on the **tuberosities**, not the neck itself.

Q: Which muscle acting on the thumb is the only one among the options that has dual nerve supply?

Flexor Pollicis Brevis. ***Flexor Pollicis Brevis (FPB)*** - The **Flexor Pollicis Brevis** is unique among thumb muscles because it commonly has a **dual nerve supply**. [1] - Its superficial head is innervated by the **median nerve**, while its deep head is innervated by the **ulnar nerve**. *Flexor Pollicis Longus (FPL)* - The **Flexor Pollicis Longus** is solely innervated by the **anterior interosseous nerve**, a branch of the **median nerve**. [1] - It does not receive any neural input from the ulnar nerve. *Adductor Pollicis* - The **Adductor Pollicis** muscle is exclusively innervated by the **deep branch of the ulnar nerve**. - It plays a crucial role in **adduction of the thumb** and does not share innervation with the median nerve. *Opponens Pollicis* - The **Opponens Pollicis** is primarily supplied by the **recurrent branch of the median nerve** (also known as the thenar motor branch). - Its function is **opposition of the thumb**, and it does not have dual innervation.

Q: Which muscle is primarily involved in the action of pulling oneself up while climbing a tree?

Latissimus Dorsi. ***Latissimus Dorsi*** - The **latissimus dorsi** is the widest muscle in the back and is crucial for adduction, extension, and internal rotation of the arm, making it the primary muscle for **pulling motions** such as climbing, chin-ups, and rowing [1]. - Its broad origins from the thoracolumbar fascia, iliac crest, and lower ribs allow it to exert significant force on the humerus, effectively pulling the body upward relative to the fixed upper limbs [1]. *Rhomboideus* - The **rhomboid major** and **minor** muscles are primarily responsible for retracting, elevating, and rotating the scapula downwards. - While they stabilize the scapula during pulling motions, they are not the main movers responsible for the overall body-raising action against gravity. *Trapezius* - The **trapezius** muscle has several parts, primarily involved in elevating, depressing, retracting, and rotating the scapula. - While it assists in stabilizing the shoulder girdle during pulling, its main role is not the direct pulling of the entire body upward. *Levator scapulae* - The **levator scapulae** muscle primarily elevates and rotates the scapula downwards. - It plays a minor role in maintaining shoulder posture but is not a significant contributor to the powerful pulling action required to lift oneself while climbing.

Q: Which of the following muscles carries out shoulder abduction from 15 to 90 degrees?

Deltoid. ***Deltoid*** - The **deltoid muscle** is the primary mover for **shoulder abduction** between **15 and 90 degrees**, continuing the initial movement started by the supraspinatus. - Its **middle fibers** are most effective in this range, pulling the humerus laterally away from the body. *Supraspinatus* - The **supraspinatus muscle** initiates **shoulder abduction** from **0 to 15 degrees**. - Beyond 15 degrees, its contribution to abduction becomes less significant compared to the deltoid. *Trapezius* - The **trapezius muscle** primarily acts to **rotate**, **retract**, and **elevate the scapula**. - It assists in shoulder abduction above **90 degrees** by upwardly rotating the scapula, but it is not directly responsible for abduction in the 15-90 degree range. *Serratus Anterior* - The **serratus anterior** is crucial for **scapular protraction** and **upward rotation** of the scapula. - It contributes to **shoulder abduction** above **90 degrees** by positioning the glenoid cavity upwards, but it does not directly abduct the arm.

Q: What movements does the coracoacromial ligament resist?

Upward displacement of humeral head. Upward displacement of humeral head - The **coracoacromial ligament** extends from the coracoid process to the acromion, forming the **coracoacromial arch** which acts as a protective roof over the humeral head. - This anatomical position allows it to act as a **passive restraint against superior migration** or upward displacement of the **humeral head**, especially important when the rotator cuff (particularly supraspinatus) is deficient. - It prevents **superior subluxation** of the humerus and protects the joint from impingement against the acromion. *Abduction of shoulder* - **Abduction** of the shoulder is primarily limited by the **inferior capsule** and **adductor muscles** (latissimus dorsi, pectoralis major, teres major). - The coracoacromial ligament does not play a significant role in limiting the range of abduction movements. *Inferior displacement of humerus* - **Inferior displacement** of the humerus is primarily resisted by the **superior capsule**, the **supraspinatus tendon**, and the **coracohumeral ligament**. - The coracoacromial ligament is positioned superiorly and therefore does not prevent downward movement of the humeral head. *External rotation* - **External rotation** of the shoulder is limited by the **anterior capsule**, **anterior glenohumeral ligaments**, and the **subscapularis muscle**. - The coracoacromial ligament's orientation and function do not contribute to resisting rotational movements of the humerus.

Q: Where does the flexor carpi radialis insert?

Base of 2nd and 3rd metacarpal. ***Base of 2nd and 3rd metacarpal*** - The **flexor carpi radialis** muscle, as its name suggests, is a powerful wrist flexor and **radial deviator**. - Its tendon typically inserts onto the **palmar aspect of the base of the second and third metacarpal bones**. *Base of 5th metacarpal* - The **5th metacarpal** is located on the **ulnar side** of the hand, which is not the insertion site for the flexor carpi radialis. - Muscles inserting near the 5th metacarpal include the **flexor carpi ulnaris** and the **extensor carpi ulnaris**. *Scaphoid and trapezium* - The **scaphoid** and **trapezium** are **carpal bones** of the wrist, but they do not serve as the direct insertion point for the flexor carpi radialis [1]. - These bones form part of the **carpal tunnel** and are involved in complex wrist movements [1]. *Capitate and hamate* - The **capitate** and **hamate** are also **carpal bones** located in the distal row of the wrist. - While they are functionally involved in wrist movements, they are not the primary insertion site for the flexor carpi radialis.

Q: Pulp of the index finger is supplied by

Median nerve. ***Median nerve*** - The **median nerve** innervates the **radial side of the hand**, including the palmar surface of the thumb, index finger, middle finger, and the radial half of the ring finger [1]. - Sensation to the **pulp of the index finger** is specifically provided by the **median nerve** [1]. *Radial nerve* - The **radial nerve** primarily supplies the **dorsum of the hand** and fingers, except for the distal phalanges. - It does not provide sensory innervation to the palmar surface or pulp of the index finger. *Ulnar nerve* - The **ulnar nerve** innervates the **ulnar side of the hand**, specifically the palmar and dorsal surfaces of the little finger and the ulnar half of the ring finger [1]. - It plays no role in the sensation of the index finger pulp. *Axillary nerve* - The **axillary nerve** innervates the **deltoid muscle** and provides sensation to the skin over the deltoid region, often referred to as the "regimental badge area." - It is located in the shoulder region and has no sensory distribution in the hand.

Q: What type of muscles are medial two lumbricals?

Bipennate. ***Bipennate*** - The **medial two lumbricals** (third and fourth) are classified as **bipennate muscles** because they originate from two adjacent tendons of the flexor digitorum profundus (FDP). - Each of these lumbricals arises from the **adjacent sides of two FDP tendons**, with muscle fibers converging toward a central insertion, creating a bipennate arrangement. - This dual origin distinguishes them from the lateral two lumbricals, which are unipennate. *Unipennate* - **Unipennate muscles** have fibers that attach obliquely to only one side of a single tendon. - The **lateral two lumbricals** (first and second) are unipennate as they each arise from a single FDP tendon. - This is not the correct classification for the medial two lumbricals. *Multipennate* - **Multipennate muscles** have multiple tendon arrangements with fibers converging at different angles from several directions. - Examples include the **deltoid muscle**, which has a much more complex architecture than lumbricals. *None of the options* - Since **bipennate** accurately describes the structure of the medial two lumbricals based on their dual tendon origins, this option is incorrect. - The architectural classification is well-established in anatomical literature.

Q: Which of the following deformities is evident in case of Erb's palsy?

Waiter's tip deformity. ***Waiter's tip deformity*** - Erb's palsy primarily affects the C5-C6 nerve roots, leading to paralysis of muscles such as the **deltoid**, **biceps**, and **brachialis**. - This results in adduction and internal rotation of the shoulder, extension of the elbow, and pronation of the forearm, mimicking a **waiter expecting a tip**. *Scapular winging* - This condition is typically caused by damage to the **long thoracic nerve**, affecting the **serratus anterior muscle**. - It results in the medial border of the **scapula protruding** from the back, which is distinct from the upper limb paralysis seen in Erb's palsy. *Ulnar claw hand* - This deformity occurs due to damage to the **ulnar nerve**, which paralyzes the **intrinsics of the hand**. - It leads to **hyperextension** of the metacarpophalangeal joints and **flexion** of the interphalangeal joints of the fourth and fifth digits. *Radial wrist drop* - **Radial nerve** injury causes paralysis of the extensors of the wrist and fingers, leading to the characteristic **wrist drop**. - This involves inability to extend the wrist and fingers, contrasting with the proximal upper limb affected in Erb's palsy.

Question 1

Posterior interosseous artery is a branch of?

Accepted Answer

Common interosseous artery

Answer

Radial artery

Answer

Median artery

Answer

Brachial artery

Question 2

Coracohumeral ligament inserts on?

Accepted Answer

Lesser and greater tuberosities

Answer

Greater tuberosity

Answer

Bicipital groove

Answer

Anatomical neck of humerus

Question 3

Which muscle acting on the thumb is the only one among the options that has dual nerve supply?

Accepted Answer

Flexor Pollicis Brevis

Answer

Flexor Pollicis Longus

Answer

Adductor Pollicis

Answer

Opponens Pollicis

Question 4

Which muscle is primarily involved in the action of pulling oneself up while climbing a tree?

Accepted Answer

Latissimus Dorsi

Answer

Rhomboideus

Answer

Trapezius

Answer

Levator scapulae

Question 5

Which of the following muscles carries out shoulder abduction from 15 to 90 degrees?

Accepted Answer

Deltoid

Answer

Trapezius

Answer

Serratus Anterior

Answer

Supraspinatus

Question 6

What movements does the coracoacromial ligament resist?

Accepted Answer

Upward displacement of humeral head

Answer

Abduction of shoulder

Answer

Inferior displacement of humerus

Answer

External rotation

Question 7

Where does the flexor carpi radialis insert?

Accepted Answer

Base of 2nd and 3rd metacarpal

Answer

Base of 5th metacarpal

Answer

Scaphoid and trapezium

Answer

Capitate and hamate

Question 8

Pulp of the index finger is supplied by

Accepted Answer

Median nerve

Answer

Radial nerve

Answer

Ulnar nerve

Answer

Axillary nerve

Question 9

What type of muscles are medial two lumbricals?

Accepted Answer

Bipennate

Answer

Multipennate

Answer

None of the options

Answer

Unipennate

Question 10

Which of the following deformities is evident in case of Erb's palsy?

Accepted Answer

Waiter's tip deformity

Answer

Scapular winging

Answer

Ulnar claw hand

Answer

Radial wrist drop

Upper Limb — MCQs

Upper Limb — MCQs

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