QuestionSBA
QuestionChoice
This is the action of flexor pollicis brevis another muscle of the thenar eminence. It is located deep to the abductor pollicis brevis.
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d
Flexes the thumb at the metacarpophalangeal joint
QuestionChoice
The arrow is highlighting one of the muscles of the thenar eminence. It is pointing to the abductor pollicis brevis which lies superficial to the opponens pollicis and flexor pollicis brevis. The main function of this muscle is to abduct the thumb at the metacarpophalangeal joint.
10008580
a
Abducts the thumb at the metacarpophalangeal joint
QuestionChoice
This is the action of abductor pollicis longus which is a muscle located in the deep layer of muscles in the posterior compartment of the forearm.
10008581
b
Abducts the carpometacarpal joint of the thumb
QuestionChoice
Adductor pollicis is involved in adduction of the thumb. It is a flat, triangular fan-shaped muscle that is located deep to the thenar muscles. It can be recognised by its characteristic two heads.
10008584
e
Adducts the thumb
QuestionChoice
This is the action of opponens pollicis muscle which is another muscles of the thenar eminence. It is the largest of the three thenar muscles and lies deep to the other two.
10008582
c
Medially rotates the thumb
Concept
Chapter
2693
5247
Muscles of the hand
Topic
258
Upper Limb Anatomy
14263
Picture
1655
168 - Muscles of the hand (abductor pollicis brevis).png
images/z4ib301k1682950220714.jpg
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images/z4ib301k1682950220714_512.jpg
awgODQL6ZHeZp2iWd4mHhwaKZ5CI
Topic
258
Upper Limb Anatomy
Which option best describes the main the action of the muscle that is labelled by the arrow?

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a