Upper Limb Practice Questions

Q: A patient is found to have a melanoma originating in the skin of the left forearm. After removal of the tumor from the forearm, all axillary lymph nodes lateral to the medial edge of the pectoralis minor muscle are removed. Which axillary nodes would not be removed?

Apical lymph nodes. ***Apical lymph nodes*** - The **apical lymph nodes** are located **medial** to the **medial border of the pectoralis minor muscle**, at the apex of the axilla (Level III) [2]. - Since the removal was restricted to nodes **lateral** to the medial edge of the pectoralis minor, the apical nodes would **not be removed**. - These nodes receive lymph from all other axillary node groups and drain into the subclavian lymphatic trunk. *Central lymph nodes* - **Central lymph nodes** are located **posterior to (deep to)** the pectoralis minor muscle, within the axillary fat (Level II) [1]. - They lie between the medial and lateral borders of the pectoralis minor and are generally considered to be **lateral** to the medial edge of the pectoralis minor, so they would be removed in this dissection. *Lateral lymph nodes* - **Lateral (humeral) lymph nodes** are found along the **lateral border** of the axilla, following the axillary vein (Level I) [1]. - These nodes drain the majority of the upper limb and are clearly **lateral** to the pectoralis minor muscle, so hese would be included in the dissection. *Pectoral lymph nodes* - **Pectoral (anterior) lymph nodes** lie along the **lower border** of the pectoralis minor muscle and the lateral thoracic vessels (Level I). - They receive lymph from the anterior and lateral thoracic walls and much of the breast. - These nodes are located **lateral** to the medial edge of the pectoralis minor and would be removed as part of the surgical procedure.

Q: Which of the following muscles is innervated by both the musculocutaneous and radial nerve?

Brachialis. ***Brachialis*** - The **brachialis muscle** lies deep to the biceps and is the primary flexor of the elbow. - It receives dual innervation from the **musculocutaneous nerve** (primarily) and a small contribution from the **radial nerve** laterally. *Biceps brachii* - The **biceps brachii** is solely innervated by the **musculocutaneous nerve** (C5, C6). - Its main actions are **supination** of the forearm and **flexion of the elbow**. *Coracobrachialis* - The **coracobrachialis** is also exclusively innervated by the **musculocutaneous nerve** (C5, C6, C7). - Its primary function is to **flex** and **adduct** the arm at the shoulder joint. *Brachioradialis* - The **brachioradialis** muscle is innervated by the **radial nerve** (C5, C6, C7). - It functions as an elbow flexor, particularly during **rapid movements** and when the forearm is in a **neutral position**.

Q: Which ligament transmits the weight of the upper limb to the axial skeleton?

Costoclavicular ligament. ***Costoclavicular ligament*** - The **costoclavicular ligament** is a strong, fibrous band connecting the first rib's superior surface and its costal cartilage to the inferior surface of the medial clavicle. - This ligament plays a crucial role in anchoring the **medial end of the clavicle** to the axial skeleton, thereby transmitting the weight of the upper limb. *Coracoacromial ligament* - This ligament connects the **coracoid process** to the **acromion** of the scapula, forming an arch over the glenohumeral joint. - Its primary function is to protect the underlying structures, such as the rotator cuff tendons, from trauma and to prevent superior displacement of the humeral head, not to transmit weight to the axial skeleton. *Coracoclavicular ligament* - The **coracoclavicular ligament** consists of two parts: the **conoid** and **trapezoid ligaments**, connecting the coracoid process of the scapula to the clavicle. - While it helps stabilize the clavicle and scapula, its main role is to suspend the scapula from the clavicle and transmit forces within the shoulder girdle, not directly to the axial skeleton. *Coracohumeral ligament* - This ligament extends from the **coracoid process** to the **greater and lesser tuberosities** of the humerus. - It strengthens the superior part of the **glenohumeral joint capsule** and helps support the weight of the upper limb when the arm is adducted, but it does not transmit weight directly to the axial skeleton.

Q: What type of joints are the metacarpophalangeal joints?

Condylar. Condylar - The metacarpophalangeal (MCP) joints are classified as condylar (condyloid) joints. - The rounded metacarpal head (condyle) articulates with the shallow concave surface of the proximal phalanx base. - This allows movement in two planes: flexion/extension and abduction/adduction, plus some circumduction. - This is the standard anatomical classification used in major anatomy references. *Ellipsoid* - Ellipsoid is sometimes used interchangeably with condylar, but it is a less specific descriptive term. - The term emphasizes the oval shape of the articular surface. - While not incorrect, condylar is the preferred anatomical classification for MCP joints. *Saddle* - Saddle joints have articular surfaces that are concave in one direction and convex in the perpendicular direction (saddle-shaped). - The classic example is the carpometacarpal joint of the thumb (1st CMC joint) [1]. - This configuration allows greater range of motion including opposition [1]. *Hinge* - Hinge joints permit movement in only one plane (uniaxial): flexion and extension. - Examples include the interphalangeal (IP) joints of the fingers and the humeroulnar joint of the elbow. - MCP joints have additional movements beyond simple hinging.

Q: Boundaries of the anatomical snuff box are all except

ECU. ***ECU*** - The **extensor carpi ulnaris (ECU)** is not a boundary of the anatomical snuff box. Its tendon inserts into the base of the 5th metacarpal, medial to the snuffbox [1][2]. - The ECU's function is **wrist extension** and **ulnar deviation**, and it does not form part of the snuffbox's borders [1]. *APL* - The **abductor pollicis longus (APL)** tendon forms the **anterior (radial) boundary** of the anatomical snuff box [1][2]. - It inserts into the base of the 1st metacarpal and is responsible for **abducting the thumb** [1]. *EPL* - The **extensor pollicis longus (EPL)** tendon forms the **posterior (ulnar) boundary** of the anatomical snuff box [1][2]. - It inserts into the distal phalanx of the thumb and is responsible for **extending the thumb interphalangeal joint**. *EPB* - The **extensor pollicis brevis (EPB)** tendon forms part of the **anterior (radial) boundary** along with the APL [1][2]. - It inserts into the proximal phalanx of the thumb and aids in **extending the thumb metacarpophalangeal joint** [1].

Q: Which spinal nerves are affected in Klumpke's paralysis?

C8-T1. ***C8-T1*** - **Klumpke's paralysis** results from damage to the lower trunks of the brachial plexus, specifically involving the **C8 and T1 spinal nerves**. - This injury often leads to a characteristic "claw hand" deformity due to paralysis of the **intrinsic hand muscles** and **flexors of the wrist and fingers**, along with potential **Horner's syndrome** if the T1 sympathetic fibers are affected. *C3-C6* - Involvement of these spinal nerves would typically affect the **upper and middle trunks of the brachial plexus**, leading to different patterns of paralysis, such as those seen in **Erb's palsy**. - This range does not specifically define Klumpke's paralysis, which is localized to the lower brachial plexus. *C6-C7* - Injury to these nerves primarily affects the **upper and middle trunks**, responsible for movements like shoulder abduction and elbow flexion. - This pattern of involvement is associated with different neurological deficits and is not characteristic of Klumpke's paralysis. *C4-C5* - Damage to these spinal nerves would primarily affect the **upper trunk of the brachial plexus**, leading to conditions like **Erb's palsy**. - This would result in paralysis of the shoulder and biceps muscles, distinct from the hand and wrist deficits seen in Klumpke's paralysis.

Q: Most common nerve to be damaged in dislocation of the shoulder is:

Axillary nerve. ***Axillary nerve*** - The **axillary nerve** is the most commonly injured nerve in **shoulder dislocations** due to its anatomical course around the surgical neck of the humerus. - Damage to the axillary nerve can lead to weakness in **deltoid abduction** and sensory loss over the **regimental badge area**. *Radial nerve* - The **radial nerve** is more commonly injured in mid-shaft humeral fractures or prolonged compression, not typically shoulder dislocations. - Injury to the radial nerve primarily affects **wrist extension** and sensation in the dorsal hand. *Median nerve* - The **median nerve** is less frequently injured in isolated shoulder dislocations and is more often associated with injuries closer to the elbow or wrist. - Damage to the median nerve causes deficits in **thumb opposition** and sensation over the palmar aspect of the first three and a half digits. *Musculocutaneous nerve* - The **musculocutaneous nerve** is relatively protected in shoulder dislocations, as it pierces the coracobrachialis muscle. - Injury to this nerve would primarily impair **forearm flexion** and sensation over the lateral forearm.

Q: What structure passes through the rotator interval?

Long head of Biceps tendon. ***Long head of Biceps tendon*** - The **rotator interval** is a triangular space in the shoulder capsule bounded superiorly by the anterior edge of the **supraspinatus tendon**, inferiorly by the superior edge of the **subscapularis tendon**, and laterally by the **coracoid process** base. - The **long head of the biceps tendon** passes through this interval, enclosed within its synovial sheath, as it courses from the supraglenoid tubercle to enter the intertubercular groove. *Long head of Triceps tendon* - The **long head of the triceps tendon** originates from the infraglenoid tubercle of the scapula and is located at the posterior aspect of the humerus, not passing through the rotator interval. - Its primary function is **elbow extension**, distinct from shoulder joint components related to the rotator interval. *Coracohumeral ligament* - The **coracohumeral ligament** forms the superior border and roof of the rotator interval but does not pass through it. - It plays a role in restricting **external rotation** and **inferior subluxation** of the humeral head. *Short head of Biceps tendon* - The **short head of the biceps tendon** originates from the coracoid process and courses medially to the shoulder joint, not entering the articular capsule or passing through the rotator interval. - It is located entirely **outside** the joint capsule.

Q: Which nerve controls the distal muscles of the hand needed for fine work?

Median nerve. ***Median nerve*** - The **median nerve** is considered the primary nerve for **fine precision work** due to its innervation of the **thenar muscles** (via recurrent branch) which control **thumb opposition** and **precision pinch** [1]. - Innervates the **LOAF muscles**: **L**ateral 2 lumbricals, **O**pponens pollicis, **A**bductor pollicis brevis, **F**lexor pollicis brevis superficial head [1]. - **Thumb opposition** is the most critical movement for fine manipulative tasks like writing, picking up small objects, and precision grip. - Median nerve injury results in **"ape hand"** deformity with loss of thumb opposition, severely impairing fine motor function. *Ulnar nerve* - The **ulnar nerve** innervates the **majority of intrinsic hand muscles**: all **interossei**, medial 2 lumbricals, **hypothenar muscles**, adductor pollicis, and deep head of flexor pollicis brevis [1]. - Essential for **finger abduction/adduction**, **grip strength**, and coordination of finger movements [2]. - While critical for overall hand function and power grip, the ulnar nerve's role is more about **power and coordination** rather than the **precision pinch** needed for the finest manipulative work. - Ulnar nerve injury causes **"claw hand"** deformity. *Radial nerve* - The **radial nerve** innervates the **extensor muscles** of the forearm, controlling wrist and finger extension [3]. - Provides **NO innervation to intrinsic hand muscles** [1]. - Important for hand positioning but not for fine distal muscle control. *Axillary nerve* - The **axillary nerve** innervates the **deltoid** and **teres minor muscles**, controlling shoulder abduction and external rotation. - Has **no role** in hand function whatsoever.

Q: Bankart's lesion is associated with which anatomical structure?

Anterior surface of the glenoid labrum. ***Anterior surface of the glenoid labrum*** - A **Bankart lesion** is an injury to the **anterior-inferior glenoid labrum** of the shoulder. - It frequently occurs after an **anterior shoulder dislocation** when the humeral head avulses the labrum from the glenoid rim. *Posterior surface of the glenoid labrum* - An injury to the posterior labrum is known as a **posterior Bankart lesion** or a **reverse Bankart lesion**, which is less common. - This type of injury is typically associated with **posterior shoulder dislocations**. *Posterior part of the head of the humerus* - A **Hill-Sachs lesion** involves an impression fracture on the **posterolateral aspect of the humeral head**. - This lesion occurs as the humeral head impacts the anterior glenoid rim during an **anterior shoulder dislocation**. *Anterior part of the head of the humerus* - Injury to the anterior part of the humeral head is less common in typical shoulder dislocations. - While it could theoretically be involved in very specific trauma, it's not the primary anatomical location for a Bankart lesion.

Question 1

A patient is found to have a melanoma originating in the skin of the left forearm. After removal of the tumor from the forearm, all axillary lymph nodes lateral to the medial edge of the pectoralis minor muscle are removed. Which axillary nodes would not be removed?

Accepted Answer

Apical lymph nodes

Answer

Central lymph nodes

Answer

Lateral lymph nodes

Answer

Pectoral lymph nodes

Question 2

Which of the following muscles is innervated by both the musculocutaneous and radial nerve?

Accepted Answer

Brachialis

Answer

Coracobrachialis

Answer

Brachioradialis

Answer

Biceps brachii

Question 3

Which ligament transmits the weight of the upper limb to the axial skeleton?

Accepted Answer

Costoclavicular ligament

Answer

Coracoclavicular ligament

Answer

Coracohumeral ligament

Answer

Coracoacromial ligament

Question 4

What type of joints are the metacarpophalangeal joints?

Accepted Answer

Condylar

Answer

Ellipsoid

Answer

Saddle

Answer

Hinge

Question 5

Boundaries of the anatomical snuff box are all except

Accepted Answer

ECU

Answer

APL

Answer

EPL

Answer

EPB

Question 6

Which spinal nerves are affected in Klumpke's paralysis?

Accepted Answer

C8-T1

Answer

C3-C6

Answer

C6-C7

Answer

C4-C5

Question 7

Most common nerve to be damaged in dislocation of the shoulder is:

Accepted Answer

Axillary nerve

Answer

Radial nerve

Answer

Median nerve

Answer

Musculocutaneous nerve

Question 8

What structure passes through the rotator interval?

Accepted Answer

Long head of Biceps tendon

Answer

Coracohumeral ligament

Answer

Long head of Triceps tendon

Answer

Short head of Biceps tendon

Question 9

Which nerve controls the distal muscles of the hand needed for fine work?

Accepted Answer

Median nerve

Answer

Radial nerve

Answer

Axillary nerve

Answer

Ulnar nerve

Question 10

Bankart's lesion is associated with which anatomical structure?

Accepted Answer

Anterior surface of the glenoid labrum

Answer

Posterior surface of the glenoid labrum

Answer

Posterior part of the head of the humerus

Answer

Anterior part of the head of the humerus

Upper Limb — MCQs

Upper Limb — MCQs

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