Question

A young male entered the ER with his left digit 5 completely cut off right through the middle of middle phalanx. The tendon of what muscle was severed?

a. extensor pollicis longus

b. flexor digitorum superficialis

c. flexor digitorum profundus

d. extensor digitorum

e. All of the above except A

Answer 1

Ans:-;e) all of the above except A

Flexor digitorum superificalis.:-

The radial head originates from the anterior portion of the radius. Flexor digitorum superficialis inserts onto the bodies of the middle phalanges of the medial four digits. This muscles action include flexion of the proximal interphalangeal joint, the metacarpophalangeal joint, and the wrist.

Extensor pollicis longus insert into the thumb. So it is not injuried in this injury.

this muscle originates from the front surface of the top part of the ulna. From the ulna, the flexor digitorum profundus muscle extends down the forearm and inserts at, or attaches to, the distal part (tip) of the the phalanges (bones of the fimgers), not including the thumb.

Extensor digitorum is a superficial muscle of the posterior compartment of the forearm. Like the majority of the muscles in this compartment, it originates via common extensor tendon that arises from the lateral epicondyle of humerus. ... The tendons insert onto the dorsal surface of digits 2-5, respectively.