Upper Limb Practice Questions

Q: Which muscle receives a muscular branch from the ulnar nerve?

Both FCU and FDP. ***Both FCU and FDP*** - The **flexor carpi ulnaris (FCU)** is solely innervated by the **ulnar nerve** in the forearm. - The **flexor digitorum profundus (FDP)** has dual innervation: the **ulnar nerve** supplies the medial half (tendons to ring and little fingers), while the anterior interosseous nerve (branch of median nerve) supplies the lateral half (tendons to index and middle fingers). - Both muscles receive muscular branches from the ulnar nerve, making this the most complete and accurate answer. *FCU* - While the FCU does receive innervation from the ulnar nerve (and only the ulnar nerve), this option is incorrect because the FDP also receives branches from the ulnar nerve. - Selecting only FCU ignores the dual innervation of FDP and is therefore an incomplete answer when "Both FCU and FDP" is available. *FDP* - While the medial half of FDP does receive innervation from the ulnar nerve, this option is incorrect because FCU also receives innervation from the ulnar nerve. - Selecting only FDP ignores the complete innervation of FCU and is therefore an incomplete answer when "Both FCU and FDP" is available. *None of the options* - This option is incorrect because both the **flexor carpi ulnaris** and the medial portion of the **flexor digitorum profundus** definitively receive muscular branches from the ulnar nerve. - The ulnar nerve provides motor innervation to these specific forearm muscles before continuing into the hand.

Q: Interosseous membrane of forearm is pierced by?

Anterior interosseous artery. ***Anterior interosseous artery*** - The **anterior interosseous artery** pierces the **interosseous membrane** in the **distal forearm** (approximately 5 cm above the wrist) to anastomose with the **posterior interosseous artery** and contribute to the **palmar carpal arch**. - This artery arises from the **common interosseous artery**, a branch of the **ulnar artery**. - This is the **classically taught structure** that pierces the interosseous membrane and is the standard answer in examination contexts. *Brachial artery* - The **brachial artery** is the main artery of the arm and terminates in the **cubital fossa** by dividing into the **radial** and **ulnar arteries**. - It does not pierce the **interosseous membrane** of the forearm as it is located in the arm, not the forearm. *Posterior interosseous artery* - The **posterior interosseous artery** arises from the **common interosseous artery** and passes **posteriorly between the oblique cord and the upper border of the interosseous membrane** to enter the posterior compartment of the forearm. - While it may pierce the membrane distally to anastomose anteriorly, the **anterior interosseous artery** is the structure **classically described** as piercing the membrane in standard anatomical teaching and examination contexts. *Ulnar recurrent artery* - The **ulnar recurrent arteries** (anterior and posterior branches) arise from the **ulnar artery** near the **cubital fossa** and ascend to participate in the **anastomosis around the elbow joint**. - These arteries do not pierce the **interosseous membrane** of the forearm.

Q: Which muscle is not part of the superficial anterior compartment of the forearm?

Flexor pollicis longus (FPL). **Flexor pollicis longus (FPL)** - The **FPL** is located in the **deep anterior compartment** of the forearm, differentiating it from the superficial muscles [1]. - Its primary function is **flexion of the thumb's interphalangeal joint**, requiring a deeper anatomical position for mechanical advantage [1]. *FDS* - The **Flexor digitorum superficialis (FDS)** is a key muscle of the superficial anterior compartment, visible just beneath the skin and fascia. - It is responsible for **flexing the middle phalanges** of the medial four digits. *FCR* - The **Flexor carpi radialis (FCR)** is situated in the superficial anterior compartment, running obliquely across the forearm. - It functions in **flexion and abduction of the wrist**. *Palmaris longus* - The **Palmaris longus** is a superficial anterior compartment muscle, though it is absent in a significant portion of the population. - When present, its main action is **flexion of the wrist** and tightening of the palmar aponeurosis.

Q: Which nerve is primarily involved in cubital tunnel syndrome?

Ulnar nerve. Ulnar nerve - **Cubital tunnel syndrome** is a condition caused by compression of the **ulnar nerve** as it passes through the cubital tunnel at the medial epicondyle of the elbow. - Symptoms typically include numbness and tingling in the **little finger** and **half of the ring finger**, along with weakness of intrinsic hand muscles [2]. *Radial nerve* - The **radial nerve** is primarily involved in conditions like **radial tunnel syndrome** or radial nerve palsy (**wrist drop**), affecting primarily extensor muscles of the forearm and hand. - Its compression site is typically in the **radial tunnel** near the elbow, distinct from the cubital tunnel. *Median nerve* - The **median nerve** is involved in **carpal tunnel syndrome** at the wrist, causing numbness and tingling in the thumb, index, middle, and radial half of the ring finger [2]. - Compression around the elbow (e.g., pronator teres syndrome) can also affect the median nerve, but this is less common than cubital tunnel syndrome [1]. *Axillary nerve* - The **axillary nerve** is responsible for sensation over the deltoid region and motor function of the deltoid and teres minor muscles. - It is often injured with **shoulder dislocations** or fractures of the surgical neck of the humerus, unrelated to cubital tunnel syndrome.

Q: Which muscle stabilizes the clavicle during movement of the shoulder?

Subclavius. ***Subclavius*** - The **subclavius muscle** originates from the first rib and inserts into the inferior surface of the clavicle, acting to **depress the clavicle** and prevent its displacement, thus enhancing shoulder stability during movement. - It plays a crucial role in protecting the underlying **neurovascular structures** (brachial plexus and subclavian vessels) from external trauma to the shoulder. *Pectoralis major* - This large, fan-shaped muscle primarily functions in **adduction, medial rotation, and flexion of the humerus** at the shoulder joint [1]. - It does not directly stabilize the clavicle but rather acts on the arm. *Latissimus dorsi* - The **latissimus dorsi** is a broad muscle of the back responsible for **extension, adduction, and internal rotation of the humerus** [1]. - Its actions are mainly on the humerus and it does not directly stabilize the clavicle. *Serratus anterior* - The **serratus anterior** muscle primarily **protracts and rotates the scapula**, keeping it pressed against the thoracic wall. - While it's essential for **scapular stability** and overhead arm movements, it does not directly stabilize the clavicle.

Q: What type of joint is the 1st carpometacarpal joint?

Saddle. ***Saddle*** - The **1st carpometacarpal joint** (thumb CMC joint) is a classic example of a **saddle joint** due to the reciprocal concave-convex opposing surfaces of the trapezium and the first metacarpal [1]. - This unique shape allows for a wide range of motion, including **flexion/extension**, **abduction/adduction**, and **opposition**, which is crucial for thumb function. *Pivot* - A **pivot joint** allows for rotational movement around a single axis, like the **atlantoaxial joint** (C1-C2) or the **proximal radioulnar joint**. - This type of motion is not characteristic of the 1st carpometacarpal joint. *Hinge* - A **hinge joint** permits movement in only one plane, like the **elbow** or **interphalangeal joints**, allowing for **flexion and extension**. - The 1st carpometacarpal joint has a greater degree of freedom than a hinge joint. *Ball and Socket* - A **ball and socket joint** offers the greatest range of motion, allowing for movement in all planes, including **circumduction and rotation**, such as the **shoulder** and **hip joints**. - While the 1st carpometacarpal joint is highly mobile, it does not achieve the full range of motion of a ball and socket joint.

Q: Sensory supply of the palm is from which nerves?

Ulnar nerve and Median nerve. **Ulnar nerve and Median nerve** *(Correct)* - The **median nerve** provides sensory innervation to the lateral palm, including the thumb, index, middle, and radial half of the ring finger [1]. - The **ulnar nerve** supplies sensory innervation to the medial palm, including the little finger and the ulnar half of the ring finger [1]. - Together, these two nerves provide complete sensory coverage of the palm [1]. *Median nerve and Radial nerve* (Incorrect) - While the **median nerve** innervates a significant portion of the palm, the **radial nerve** primarily supplies the dorsal aspect of the hand and a small area of the thenar eminence, not the entire palm. - The radial nerve's sensory supply to the palm is usually limited to a very small area at the base of the thumb. - This combination does not provide complete palmar sensory coverage. *Radial nerve and ulnar nerve* (Incorrect) - The **radial nerve** mainly supplies the dorsum of the hand and digits, with minimal palmar contribution, making this option incorrect for primary palmar sensory supply. - The **ulnar nerve** does innervate part of the palm, but the combination with the radial nerve for complete palmar supply is inaccurate. - The median nerve, not the radial nerve, is the other major contributor to palmar sensation. *Musculocutaneous nerve and Radial nerve* (Incorrect) - The **musculocutaneous nerve** primarily innervates the lateral aspect of the forearm (as the lateral antebrachial cutaneous nerve) and does not contribute to the sensory supply of the palm. - The **radial nerve** also has a limited role in palmar sensation. - Neither of these nerves provides significant sensory innervation to the palm.

Q: Long thoracic nerve arises from which nerve roots?

C5 C6 C7. ***C5 C6 C7*** - The long thoracic nerve is formed from the **anterior rami** of the fifth, sixth, and seventh **cervical nerves (C5, C6, C7)**. - This nerve uniquely descends posterior to the **brachial plexus** and innervates the **serratus anterior muscle**. *C6 C7 T1* - While these roots contribute to other brachial plexus nerves, the **long thoracic nerve** specifically excludes T1. - T1 is more commonly associated with the **lower trunk** of the brachial plexus and nerves like the **ulnar nerve**. *C7 T1 T2* - The long thoracic nerve arises primarily from **cervical roots** and does not typically include T2. - **T2 involvement** in neural innervation of the upper limb is less common for the main nerves. *C5, C6, C7, T1* - The inclusion of T1 in this option makes it incorrect for the **long thoracic nerve**. - The T1 root contributes to other nerves of the **brachial plexus**, not the long thoracic nerve.

Q: Not seen in carpal tunnel syndrome is:

Sensory loss on lateral 3½ of palm. ***Sensory loss on lateral 3½ of palm*** - In **carpal tunnel syndrome**, sensory loss typically affects the **lateral 3½ digits** (thumb, index, middle, and radial half of the ring finger) and the corresponding palm *distal to the wrist crease*. The palm *proximal to the wrist crease* is spared because its sensation is supplied by the **palmar cutaneous branch of the median nerve**, which originates proximal to the carpal tunnel. - Therefore, **sensory loss on the lateral 3½ of the palm *before the wrist crease*** is not characteristic of carpal tunnel syndrome, as this area is innervated by the palmar cutaneous branch which passes *outside* the carpal tunnel. The wording implies a broader palmar involvement, which would be inconsistent. *Pain of medial 3 fingers* - This is a common and characteristic symptom of carpal tunnel syndrome, as the **median nerve** innervates the lateral side of the hand, including the thumb, index, middle, and radial half of the ring finger. - Patients often describe **numbness, tingling, and pain** radiating into these fingers, particularly during activities that involve sustained wrist flexion or extension. *Ape thumb deformity* - This deformity is a sign of **chronic, severe median nerve compression** in carpal tunnel syndrome, leading to atrophy of the **thenar muscles** (abductor pollicis brevis, opponens pollicis, and superficial head of flexor pollicis brevis). - The thumb becomes **adducted and externally rotated**, lying in the same plane as the other fingers, resembling an ape's thumb. *Symptoms worsen at night* - This is a classic presentation of carpal tunnel syndrome, often due to **fluid accumulation** in the wrist and prolonged wrist flexion during sleep. - Patients frequently report being **woken up by numbness and pain** in their hands, requiring them to shake or move their hands for relief.

Question 1

Which muscle receives a muscular branch from the ulnar nerve?

Accepted Answer

Both FCU and FDP

Answer

FCU

Answer

None of the options

Answer

FDP

Question 2

Interosseous membrane of forearm is pierced by?

Accepted Answer

Anterior interosseous artery

Answer

Brachial artery

Answer

Posterior interosseous artery

Answer

Ulnar recurrent artery

Question 3

Which muscle is not part of the superficial anterior compartment of the forearm?

Accepted Answer

Flexor pollicis longus (FPL)

Answer

FDS

Answer

FCR

Answer

Palmaris longus

Question 4

In axillary nerve paralysis, which of the following statements is false?

Accepted Answer

Extension of shoulder with arm abducted to 90 degrees is impossible

Answer

Deltoid muscle is wasted

Answer

Small area of numbness is present over the shoulder region

Answer

Patient cannot initiate abduction

Question 5

Which nerve is primarily involved in cubital tunnel syndrome?

Accepted Answer

Ulnar nerve

Answer

Radial nerve

Answer

Median nerve

Answer

Axillary nerve

Question 6

Which muscle stabilizes the clavicle during movement of the shoulder?

Accepted Answer

Subclavius

Answer

Pectoralis major

Answer

Latissimus dorsi

Answer

Serratus anterior

Question 7

What type of joint is the 1st carpometacarpal joint?

Accepted Answer

Saddle

Answer

Pivot

Answer

Hinge

Answer

Ball and Socket

Question 8

Sensory supply of the palm is from which nerves?

Accepted Answer

Ulnar nerve and Median nerve

Answer

Median nerve and Radial nerve

Answer

Radial nerve and ulnar nerve

Answer

Musculocutaneous nerve and Radial nerve

Question 9

Long thoracic nerve arises from which nerve roots?

Accepted Answer

C5 C6 C7

Answer

C6 C7 T1

Answer

C7 T1 T2

Answer

C5 C6 C7 T1

Question 10

Not seen in carpal tunnel syndrome is:

Accepted Answer

Sensory loss on lateral 3½  of palm

Answer

Pain of medial 3 fingers

Answer

Ape thumb deformity

Answer

Symptoms worsen at night

Upper Limb — MCQs

Upper Limb — MCQs

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