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Intrinsic Hand Muscles
Origins, insertions, innervation, action, and blood supply of intrinsic muscles of the hand
65
Anatomy
Graduate
09/15/2011

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Term
Abductor pollicis brevis: origin
Definition
flexor retinaculum, scaphoid and trapezium bones
Term
Abductor pollicis brevis: insertion
Definition
lateral side of proximal base of thumb
Term
Abductor pollicis brevis: innervation
Definition
recurrent branch of median nerve (C8,T1)
Term
Abductor pollicis brevis: action
Definition
abducts and assists opposition of the thumb
Term
Abductor pollicis brevis: blood supply
Definition
superficial palmar branch of radial a.
Term
Flexor pollicis brevis: origin
Definition
flexor retinaculum and trapezium bone
Term
Flexor pollicis brevis: insertion
Definition
lateral side of proximal phalanx of thumb
Term
Flexor pollicis brevis: innervation
Definition
recurrent branch of median n. (C8,T1)
Term
Flexor pollicis brevis: action
Definition
flexes proximal phalanx of thumb
Term
Flexor pollicis brevis: blood supply
Definition
superficial palmar branch of radial a.
Term
Opponens pollicis: origin
Definition
flexor retinaculum and trapezium bone
Term
Opponens pollicis: insertion
Definition
lateral side of metacarpal I
Term
Opponens pollicis: innervation
Definition
recurrent branch of median n. (C8,T1)
Term
Opponens pollicis: action
Definition
draws metacarpal I forward and medially
Term
Opponens pollicis: blood supply
Definition
superficial palmar branch of radial a.
Term
Adductor pollicis: origin
Definition
oblique head: bases of metacarpals II and III; capitate and trapezoid bones
transverse head: anterior surface of metacarpal III
Term
Adductor pollicis: insertion
Definition
medial side of base of proximal phalanx of thumb
Term
Adductor pollicis: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Adductor pollicis: action
Definition
adducts and flexes thumb
Term
Adductor pollicis: blood supply
Definition
deep palmar arch
Term
Palmaris brevis: origin
Definition
palmar aponeurosis
Term
Palmaris brevis: insertion
Definition
skin on ulnar border of palm
Term
Palmaris brevis: innervation
Definition
superficial palmar branch of ulnar n. (C8)
Term
Palmaris brevis: action
Definition
deepens the hollow of the hand
Term
Palmaris brevis: blood supply
Definition
superficial palmar arch
Term
Abductor digiti minimi: origin
Definition
pisiform bone, tendon of flexor carpi ulnaris
Term
Abductor digiti minimi: insertion
Definition
medial side of base of proximal phalanx of little finger
Term
Abductor digiti minimi: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Abductor digiti minimi: action
Definition
abducts the little finger
Term
Abductor digiti minimi: blood supply
Definition
deep palmar branch of ulnar a.
Term
Flexor digiti minimi brevis: origin
Definition
flexor retinaculum and hook of hamate bone
Term
Flexor digiti minimi brevis: insertion
Definition
medial side of base of proximal phalanx of little finger
Term
Flexor digiti minimi brevis: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Flexor digiti minimi brevis: action
Definition
flexes proximal phalanx of the little finger
Term
Flexor digiti minimi brevis: blood supply
Definition
deep palmar branch of ulnar a.
Term
Opponens digiti minimi: origin
Definition
flexor retinaculum and hook of hamate bone
Term
Opponens digiti minimi: insertion
Definition
medial border of metacarpal V
Term
Opponens digiti minimi: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Opponens digiti minimi: action
Definition
draws metacarpal V forward to face thumb
Term
Opponens digiti minimi: blood supply
Definition
deep palmar branch of ulnar a.
Term
Lumbricals I and II: origin
Definition
lateral two tendons of flexor digitorum profundus
Term
Lumbricals I and II: insertion
Definition
lateral sides of extensor expansion of index and middle fingers
Term
Lumbricals I and II: innervation
Definition
median n. (C8,T1)
Term
Lumbricals I and II: action
Definition
extends index and middle fingers at the interphalangeal joints and flexes metacarpophalangeal joints 1 and 2
Term
Lumbricals I and II: blood supply
Definition
superficial and deep palmar arches
Term
Lumbricals III and IV: origin
Definition
medial three tendons of flexor digitorum profundus
Term
Lumbricals III and IV: insertion
Definition
lateral sides of extensor expansion of digits 4 and ring finger
Term
Lumbricals III and IV: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Lumbricals III and IV: action
Definition
extends ring and little fingers at the interphalangeal joints and flexes metacarpophalangeal joints 3 and 4
Term
Lumbricals III and IV: blood supply
Definition
superficial and deep palmar arches
Term
Dorsal interossei I to IV: origin
Definition
adjacent sides of two metacarpal bones
Term
Dorsal interossei I: insertion
Definition
lateral side of proximal phalanx of index finger
Term
Dorsal interossei II: insertion
Definition
lateral side of proximal phalanx of middle finger
Term
Dorsal interossei III: insertion
Definition
medial side of proximal phalanx of middle finger
Term
Dorsal interossei IV: insertion
Definition
medial side of proximal phalanx of ring finger
Term
Dorsal interossei I to IV: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Dorsal interossei I to IV: action
Definition
abducts the index and ring fingers from the middle finger
Term
Dorsal interossei I to IV: blood supply
Definition
deep palmar arch
Term
Palmar interossei I to III: origin
Definition
palmar surfaces of metacarpals II, IV, and V
Term
Palmar interossei I: insertion
Definition
medial side of proximal phalanx of index finger
Term
Palmar interossei II: insertion
Definition
lateral side of proximal phalanx of ring finger
Term
Palmar interossei III: insertion
Definition
lateral side of proximal phalanx of little finger
Term
Palmar interossei I to III: innervation
Definition
deep branch of ulnar n. (C8,T1)
Term
Palmar interossei I to III: action
Definition
adducts the index, ring, and little finger towards the middle finger
Term
Palmar interossei I to III: blood supply
Definition
deep palmar arch
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