Question
Identify the structure pointed in the anatomical snuff box.
| A. | Adductor pollicis |
| B. |
Extensor pollicis brevis |
| C. |
Flexor pollicis longus |
| D. |
Cephalic vein |
Show Answer
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Correct Answer � B Explanation |
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- Bounded between 2 extensor tendons of thumb i.e., Extensor pollicis brevis in 1st compartment and Extensor pollicis longus in the 3rd compartment
- Extensor pollicis brevis: A short tendon which is coming from the posterior forearm forms the antelolateral boundary.
- Extensor pollicis longus : A long tendon from the posterior forearm forms the posteromedial boundary.
- Radial artery passes through the anatomical snuff box. The radial artery can be palpated against the scaphoid bone, which lies on the floor of the anatomical snuffbox.
Incorrect Options:
Option A- Adductor pollicis:
- The adductor pollicis muscle is attached to the bases of the 2nd and 3rd metacarpals, capitate, and adjacent carpals and innervated by the deep branch of the ulnar nerve.
- Adducts thumb towards the lateral border of palm.
Option C- Flexor pollicis longus: The flexor pollicis longus is one of the deep muscles of the anterior compartment of the forearm and is innervated by the anterior interosseous nerve.
Option D- Cephalic vein:
- The roof of the anatomical snuff box contains the cephalic vein and the cutaneous branch of the radial nerve.