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Hand
Muscles
45
Anatomy
Professional
10/22/2011

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Term
What is the origin of the Abductor pollicis brevis muscle?
Definition
scaphoid, trapezium and flexor retinaculum
Term
What is the insertion of the abductor pollicis brevis muscle?
Definition
lateral base of thumb's proximal phalanx
Term
What is the innervation of the abductor pollicis brevis muscle?
Definition
median nerve
Term
What is the action of the abductor pollicis brevis?
Definition
abducts the thumb
Term
What is the origin of the flexor pollicis brevis muscle?
Definition
flexor retinaculum
Term
What is the insertion of the flexor pollicis brevis?
Definition
lateral side of base of proximal phalanx
Term
What is the innervation of the flexor pollicis brevis?
Definition
median nerve
Term
What is the action of the flexor pollicis brevis?
Definition
flexes metacarpophalangeal joint of thumb
Term
What is the origin of the opponens pollicis?
Definition
flexor retinaculum
Term
What is the insertion of the opponens pollicis?
Definition
1st metacarpal bone
Term
What is the innervation of the opponens pollicis?
Definition
median nerve
Term
What is the action of the opponens pollicis?
Definition
pulls thumb medially and forward across palm
Term
What is the origin of the adductor pollicis?
Definition
bases of 2-3 metacarpals; front of 3rd metacarpal bone
Term
What is the insertion of adductor pollicis?
Definition
base of proximal phalanx of thumb
Term
What is the innervation of the adductor pollicis muscle?
Definition
deep branch of ulnar nerve
Term
What is the action of adductor pollicis muscle?
Definition
adducts the thumb
Term
What is the origin of the abductor digiti minimi muscle?
Definition
pisiform bone
Term
What is the insertion of the abductor digiti minimi muscle?
Definition
base of proximal phalanx of little finger
Term
What is the innervation of the abductor digiti minimi muscle?
Definition
deep branch of the ulnar nerve
Term
What is the action of the abductor digiti minimi muscle?
Definition
abducts the little finger
Term
What is the origin of the flexor digiti minimi muscle?
Definition
flexor retinaculum
Term
Insertion of digiti minimi muscle
Definition
proximal phalanx of little finger
Term
Innervation of flexor digiti minimi muscle?
Definition
deep branch of ulnar nerve
Term
action of flexor digiti minimi muscle
Definition
flexes little finger at metacarpophalangeal joint
Term
origin of opponenes digiti minimi muscle
Definition
flexor retinaculum
Term
insertion of opponens digiti minimi muscle
Definition
medial border of 5th metacarpal bone
Term
Innervation of opponens digiti minimi muscle
Definition
deep branch of ulnar nerve
Term
action of opponens digiti minimi muscle
Definition
brings 5th metacarpal bone toward thumb
Term
origin of palmaris brevis muscle
Definition
flexor retinaculum and palmar aponeurosis
Term
insertion of palmaris brevis
Definition
skin of palm
Term
innervation of palmaris brevis muscle
Definition
superficial branch of ulnar nerve
Term
action of palmaris brevis muscle
Definition
improves grip of palm by corrugating skin
Term
What is the origin of the lumbrical muscles?
Definition
tendons of flexor digitorum profundus muscle in palm
Term
What is the insertion of the lumbrical muscles?
Definition
extensor expansion of 1st phalanx (fingers 2-5)
Term
What is the innervation of the lateral 2 lumbrical muscles?
Definition
median nerve
Term
What is the innervation of the medial two lumbrical muscles?
Definition
ulnar nerve
Term
What is the action of the lumbrical muscles?
Definition
flexes fingers at metacarpophalangeal joints and extends fingers at interphalangeal joint
Term
What is the origin of the palmar interosseous muscles?
Definition
side of metacarpal bone that faces midaxis of hand (2nd, 4th, 5th)
Term
What is the insertion of the palmar interosseous muscles?
Definition
extensor expansion on 1st phalanx of each finger, except 3rd finger
Term
What is the innervation of the palmar interosseous muscles?
Definition
ulnar nerve
Term
What is the action of the palmar interosseous muscles?
Definition
adducts fingers toward 3rd finger
Term
origin of dorsal interosseous muscles
Definition
sides of metacarpals
Term
insertion of dorsal interosseous muscles
Definition
extensor expansion of 1st phalanx of fingers 1-4
Term
innervation of dorsal interosseous muscles
Definition
deep branch of ulnar nerve
Term
action of dorsal interosseous muscles
Definition
abducts the fingers from 3rd finger
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