hand Flashcards
opponens pollicis
Origin: Tubercle of trapezium bone and flexor retinaculum of hand.
Insertion: Anterolateral aspect of body of first metacarpal bone.
Action: Opposes thumb towards other fingers. Innervation: Recurrent branch of median nerve (C8-T1).
extensor pollicis brevis
O: post distal radius and interosseous membrane
I: dorsal aspect of base proximal phalanx thumb
A: extends thumb
N: post. antebrachial interosseous nerve (c7-C8)
extensor pollicis longus
O: post 1/3 ulna and interosseous membrane
I:
dorsal base of distal phalanx of thumb
A: extends thumb
N: post. antebrachial interosseous nerve c7-c6
abductor pollicis brevis
O: tubercles of scaphoid and trapezium, flexor retinaculum
I: lateral aspect of base of proximal phalanx of thumb
A: abducts thumb
N: median nerve C8-t1
abductor pollicis longus
O: posterior proximal ulna, radius, interosseous membrane
I: lateral aspect of base of first metatarsal bone
A: abducts and extends thumb
N: post. antebrachial interosseous nerve c7-c8
extensor indicis
O: post distal ulna, interosseous membrane
I: extensor expansion of 2nd digit
A: extends 2nd digit
N: post antebrachial interosseous nerve c7-c8
extensor digiti minimi
O: lateral epicondyle
I: extensor expansion of 5th digit
A: extension 5th digit
N: post. antebrachial interosseous nerve c7-c8
flexor pollicis longus
O: ant surface of radius and interosseous membrane
I: palmar aspect of base of distal phalanx of thumb
A: flexes thumb
N: ant. antebrachial interosseous nerve c7-t1
flexor pollicis brevis
O; trapezium, palmar capitate and trapezoid bones, flexor retinaculum of hand
I: lateral aspect base of proximal phalanx
A: flexes thumb
N: median nerve C8-t1, ulnar nerve C8t1
adductor pollicis
Origin: Palmar aspects of capitate bone, bases of second and third metacarpal bones, and body of third metacarpal bone.
Insertion: Medial base of the proximal phalanx of thumb.
Action: Adducts thumb at its carpometacarpal joint. Innervation: Deep branch of ulnar nerve (C8-T1).
abductor digiti minimi
Origin: Pisiform bone and tendon of flexor carpi ulnaris. Insertion: Medial aspect of base of proximal phalanx of little finger.
Action: Abducts little finger at its metacarpophalangeal joint. Innervation: Deep branch of ulnar nerve (C8-T1).
flexor digiti minimi brevis
Origin: Hook of hamate bone and flexor retinaculum of hand. Insertion: Medial aspect of base of proximal phalanx of little finger.
Action: Flexes little finger at its metacarpophalangeal joint. Innervation: Deep branch of ulnar nerve (C8-T1).
opponens digiti minimi
Origin: Hook of hamate bone and flexor retinaculum of hand. Insertion: Medial aspect of fifth metacarpal bone.
Action: Opposes little finger towards thumb. Innervation: Deep branch of ulnar nerve (C8-T1).
lumbricals main function
These muscles mainly act to simultaneously flex the metacarpophalangeal joints and extend the interphalangeal joints of the fingers.
dorsal interossei
abduct the index, middle, and ring fingers at their metacarpophalangeal joints; - simultaneously flex the metacarpophalangeal joints and extend the interphalangeal joints of the index, middle, and ring fingers.
palmar interossei
adduct the index, ring, and little fingers at their metacarpophalangeal joints; - simultaneously flex the metacarpophalangeal joints and extend the interphalangeal joints of the index, ring, and little fingers.
