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The flexor pollicis brevis is a muscle in the hand that flexes the thumb. It is one of three thenar muscles. [1] [2] It has both a superficial part and a deep part.
Abductor pollicis brevis abducts the thumb. This muscle is the most superficial of the thenar group. Flexor pollicis brevis, which lies next to the abductor, will flex the thumb, curling it up in the palm. (The flexor pollicis longus, which is inserted into the distal phalanx of the thumb, is not considered part of the thenar eminence.)
The thenar eminence refers to the group of muscles on the palm at the base of the thumb. The three muscles composing the thenar eminence are the abductor pollicis brevis, flexor pollicis brevis and opponens pollicis. [5] The other two muscles that influences movement of the thumb are the adductor pollicis and the first dorsal interosseous muscle.
opponens pollicis muscle; abductor pollicis brevis muscle; superficial part of flexor pollicis brevis muscle; A separate, more proximal branch of the median nerve additionally provides motor innervation to the 1st and 2nd lumbricals of the hand. All other intrinsic muscles of the hand receive motor innervation via the ulnar nerve. [2]
abductor pollicis brevis, opponens pollicis, and first and second lumbricals. Ulnar: Flexor carpi ulnaris, flexor digitorum profundus (half), palmaris brevis, flexor digiti minimi, abductor digiti minimi, opponens digiti minimi, adductor pollicis, flexor pollicis brevis (deep head), palmar and dorsal interossei, and third and fourth lumbricals.
However, the deep head of the flexor pollicis brevis originates on the thumb's ulnar sesamoid bone and the oblique portion of the adductor pollicis on several carpal bones, as well as the bases of the second and third metacarpal bones and not on the first metacarpal. [3]
The muscles of hypothenar eminence are from medial to lateral: Opponens digiti minimi; Flexor digiti minimi brevis; Abductor digiti minimi; The intrinsic muscles of hand can be remembered using the mnemonic, "A OF A OF A" for, Abductor pollicis brevis, Opponens pollicis, Flexor pollicis brevis (the three thenar muscles), Adductor pollicis, and the three hypothenar muscles, Opponens digiti ...
flexor pollicis longus, flexor pollicis brevis: 2 1 extensor pollicis longus: Upper limb, Forearm, anatomical snuffbox, Right/left ulna, interosseous membrane of forearm: distal phalanx of thumb: posterior interosseous artery: posterior interosseous nerve (C7, C8) extends thumb (metacarpophalangeal and interphalangeal) flexor pollicis longus ...