QuestionSBA
QuestionChoice
The extensor pollicis brevis is supplied by the posterior interosseous nerve, a branch of the radial nerve.
10041223
c
This muscle is supplied by the recurrent branch of the median nerve.
QuestionChoice
The extensor pollicis brevis does travel through the first extensor compartment but **not** with the tendon of the extensor pollicis longus muscle. It travels with the tendon of the abductor pollicis longus muscle.
10041224
d
It travels through the first extensor compartment with the tendon of the extensor pollicis longus muscle.
QuestionChoice
The image highlights the extensor pollicis brevis muscle, which is found in the posterior muscle compartment of the forearm. This muscle originates from the posterior surface of the radius and the interosseous membrane. It inserts at the base of the proximal phalanx of the thumb, facilitating thumb extension and abduction at the carpometacarpal joint.
10041221
a
This muscle attaches to the base of the proximal phalanx of the thumb.
QuestionChoice
The extensor pollicis brevis muscle only acts on the metacarpophalangeal and carpometacarpal joints as it inserts at the base of the proximal phalanx.
10041225
e
This muscle acts to extend the thumb at the interphalangeal, metacarpophalangeal and carpometacarpal joints.
QuestionChoice
The muscle indicated by the arrow is the extensor pollicis brevis, the tendon of this muscle forms the radial border of the anatomical snuffbox. The ulnar border is formed by the extensor pollicis longus.
10041222
b
The tendon of this muscle forms the ulnar border of the anatomical snuffbox.
Concept
Chapter
2693
6275
Anatomical snuffbox
Topic
258
Upper Limb Anatomy
20543
Picture
3142
147 - Anatomical snuffbox (extensor pollicis brevis).png
images/nnac3evm1727764582338.jpg
images/nnac3evm1727764582338_256.jpg
images/nnac3evm1727764582338_512.jpg
ozgCCwJDawErWlJ4No939Gk=
Topic
258
Upper Limb Anatomy
Which statement below is true regarding the muscle labelled by the blue arrow in this image?

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a