Question29 Which one of the following statements regarding the muscles of the forearm is correct? Brachioradialis attaches to the lateral epicondyle Extensor carpi ulnaris is innervated by the radial nerve Flexor digitorum profundus attaches to the middle phalanges of digits 1-4 Palmaris longus passes through the carpal tunnel Flexor carpi radialis adducts the wrist joint ResetMaximum marks: 1 Flag question undefined

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Question restatement: Which one of the following statements regarding the muscles of the forearm is correct? Options: 
- Brachioradialis attaches to the lateral epicondyle
- Extensor carpi ulnaris is innervated by the radial nerve
- Flexor digitorum profundus attaches to the middle phalanges of digits 1-4
- Palmaris longus passes through the carpal tunnel
- Flexor carpi radialis adducts the wrist joint

Analysis of each option:
- Option 1: 'Brachioradialis attaches to the lateral epicondyle' — This is inaccurate. The brachioradialis originates from the lateral supracondylar ridge of the humerus and inserts on the distal radius (near the styloid process), not at the lateral epicondyle. The lateral epicondyle is the origin for common extensor muscles, not brachioradialis.

- Option 2: 'Extensor carpi ulnaris is innervated by the radial nerve' — This statement is correct in its innervation. The extensor group in the posterior forearm is supplied by the deep branch of the radial nerve (posterior interosseous nerve). The radial nerve is the overarching nerve for this region, and its deep branch specifically innervates the extensor carpi ulnaris among others.

- Option 3: 'Flexor digitorum profundus attaches to the middle phalanges of digits 1-4' — This is false. The flexor digitorum profundus inserts on the bases of the distal phalanges (not the middle phalanges) of digits 2-5, and its tendons pass through the flexor digitorum superficialis to reach those distal phalanges. Digits 1 (thumb) have a different pattern and are typically not all in the same articulation as digits 2-5 here.

- Option 4: 'Palmaris longus passes through the carpal tunnel' — This statement is debated in some texts, but classic anatomy describes the palmaris longus tendon as a relatively small tendon that ascends to the palmar aponeurosis and does not reliably pass through the carpal tunnel. Since carpal tunnel contents are primarily the long flexor tendons and the median nerve, and because not all individuals have a palmaris longus, this option is considered not accurate in standard teaching.

- Option 5: 'Flexor carpi radialis adducts the wrist joint' — This is incorrect in terms of the primary action. Flexor carpi radialis flexes the wrist and abducts (radially deviates) the wrist, not adducts. Adduction of the wrist is performed mainly by flexor carpi ulnaris.

Putting the pieces together, only the statement about extensor carpi ulnaris being innervated by the radial nerve aligns with anatomical facts, while the others contain clear anatomical inaccuracies or misleading details.

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