Brachial Plexus Anatomy

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Which nerve supplies the medial half of the flexor digitorum profundus and the flexor carpi ulnaris muscles?

Ulnar nerve (correct)
Radial nerve
Musculocutaneous nerve
Median nerve

Which nerve supplies most of the intrinsic muscles of the hand, including the hypothenar eminence, and the skin on the medial side of the hand?

Radial nerve
Ulnar nerve (correct)
Median nerve
Musculocutaneous nerve

Which nerve injury can cause a 'claw hand' deformity?

Median nerve injury
Musculocutaneous nerve injury
Ulnar nerve injury (correct)
Radial nerve injury

Which nerve supplies the biceps, coracobrachialis, and brachialis muscles?

Musculocutaneous nerve (D) Signup and view all the answers

Which nerve injury can result in a 'wrist drop' deformity?

Radial nerve injury (C) Signup and view all the answers

Which brachial plexus injury is characterized by a 'waiter's tip' deformity, with the arm adducted, medially rotated, and pronated?

Upper brachial plexus injury (Erb-Duchenne palsy) (D) Signup and view all the answers

Which branch of the medial cord of the brachial plexus is responsible for innervating the flexor muscles of the forearm, except for the flexor carpi ulnaris and the medial half of the flexor digitorum profundus?

Median nerve (C) Signup and view all the answers

Which branch of the posterior cord of the brachial plexus is responsible for innervating the teres minor and deltoid muscles, as well as the skin over the inferior part of the deltoid?

Axillary nerve (A) Signup and view all the answers

Which branch of the medial cord of the brachial plexus is responsible for innervating the pectoralis minor and part of the pectoralis major muscles?

Medial pectoral nerve (D) Signup and view all the answers

Which disorder is characterized by the inability to flex the first and second fingers at the proximal interphalangeal joints, due to median nerve dysfunction?

Pope's hand (hand of benediction) (C) Signup and view all the answers

Which branch of the posterior cord of the brachial plexus is responsible for innervating the subscapularis and teres major muscles?

Lower subscapular nerve (A) Signup and view all the answers

Which disorder is characterized by the inability to flex the fingers due to median nerve dysfunction, resulting in a hand that resembles an ape's hand?

Ape hand (A) Signup and view all the answers

Which part of the brachial plexus is formed by the union of the anterior rami of C5-C8 & T1?

Roots (D) Signup and view all the answers

Which trunk of the brachial plexus is formed by C5& C6?

Superior trunk (D) Signup and view all the answers

Which part of the brachial plexus innervates the muscles of the anterior compartment in the arm and forearm?

Anterior divisions (C) Signup and view all the answers

Which part of the brachial plexus forms the lateral cord?

Superior & middle anterior divisions (B) Signup and view all the answers

What is responsible for forming the posterior cord in the brachial plexus?

Posterior divisions (D) Signup and view all the answers

Which structure joins the roots of the brachial plexus as they pass between the scalene muscles?

Sympathetic fibers from cervical ganglia (A) Signup and view all the answers

Which nerve is responsible for innervating the rhomboid muscles?

Dorsal scapular nerve (D) Signup and view all the answers

Which branch of the brachial plexus passes through the scapular notch under the superior transverse scapular ligament?

Suprascapular nerve (B) Signup and view all the answers

Which muscle is innervated by the long thoracic nerve?

Serratus anterior (C) Signup and view all the answers

Which branch of the brachial plexus innervates the subclavius muscle and the sternoclavicular joint?

Nerve to subclavius (D) Signup and view all the answers

Which of the following brachial plexus branches can be affected in a condition called Parsonage-Turner syndrome?

Long thoracic nerve (B) Signup and view all the answers

Which branch of the brachial plexus can be affected in a condition called winged scapula?

Long thoracic nerve (A) Signup and view all the answers

Which muscles are innervated by the median nerve?

Abductor pollicis brevis, flexor pollicis brevis, opponens pollicis, 1st and 2nd lumbricals (B) Signup and view all the answers

What is the condition referred to as 'ape hand' caused by?

Injury to the median nerve (D) Signup and view all the answers

Which of the following is NOT a symptom of carpal tunnel syndrome?

Weakness in the abductor pollicis longus muscle (C) Signup and view all the answers

What is the cause of carpal tunnel syndrome?

Compression of the median nerve under the transverse carpal ligament (C) Signup and view all the answers

Which of the following tests is used to diagnose carpal tunnel syndrome?

Tinel's sign and Phalen's test (C) Signup and view all the answers

Which branch of the brachial plexus does the median nerve arise from?

Medial cord (C) Signup and view all the answers

Ulnar Nerve

A nerve that supplies the medial half of the flexor digitorum profundus and the flexor carpi ulnaris muscles, and most intrinsic hand muscles.

Claw Hand

A deformity caused by ulnar nerve injury, characterized by the inability to flex the fingers.