OINA of hand

most intrinsic muscles are innervated by

the ulnar nerve with few exceptions on the thenar side of the hand

thenar muscles (in order from lateral side of thumb to medial)

opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, and adductor pollicis

opponens pollicis origin

flexor retinaculum and tubercles of scaphoid and trapezium

opponens pollicis attatcment

lateral side of 1st metacarpal

opponens pollicis brevis action

Opposition of thumb at CMC joint

opponens pollicis innervation

Median nerve (C8, T1)

abductor pollicis brevis origin

flexor retinaculum, tubercles of scaphoid, and trapezium

abductor pollicis brevis insertion

lateral side of base of proximal phalanx of thumb

abductor pollicis brevis action

ABduct thumb, helps oppose it

ABductor pollicis brevis innervation

median nerve (C8,T1)

flexor pollicis brevis origin

Flexor retinaculum and tubercles of scaphoid and trapezium

insertion of flexor pollicis brevis

lateral side of proximal phalnyx of thumb

flexor pollicis brevis action

flex thumb at CMC

innervation of flexor pollicis brevis

median nerve

Adductor pollicis Origin

oblique head: bases of 2nds and 3rd metacarpals, capitate, adjacent carpals

trasnverse head: anterior surface of shaft of 3rd metacarpal

adductor pollicis insertion

medial side of base of proximal phalnyx of thumb

adductor pollicis action

adducts thumb

innervation of adductor pollicis

ulnar nerve C8, T1

thenar side intrinsic muscles supplied by median nerve

O - opponens polllicis

A- abductor pollice brevis

F- flexor pollicis brevis

thenar intrinsic muscle supplied by ulnar nerve

adductor pollicis

hypothenar side intrinsic muscles supplied by ulnar nerve (C8, T1)

A- abductor digiti minimi

F- flexor digiti minimi brevis

O- opponens digiti minimi

abductor digiti minimi origin

pisiform

Abductor digiti minimi insertion

medial side of base base of proximal 5th phalnyx

action of abductor digiti minimi

abducts 5th finger, assists in flex of proximal phalnyx

flexor digiti minimi brevis origin

hook of hamate and flexor retinaullum

flexor digiti minimi insertion

medial side of base of proximal phalynx 5th finger

flexor digiti minimi action

flexes proximal finger

opponens digiti minmi

hook of hamate

opponens digiti minimi insertion

medial border of 5th metacarpal

action of opponens digit minimi

draws in pinky anteriorly and rotates it to reach opposition of thumb.

innervation of hypothenar muscles

deep branch of ulnar nrver c8 t1

Lumbricals (1-4)

wave! flex metacarpophalangeal joints, extend interphalangeal joints of 2-5 fingers

lumbricals 1 and 2

innervated by median nerve C8, T1

lumbricals 3 and 4

innervated by deep branch of ulnar nerve C8, T1

Dorsal interossei (1-4)

-D(AB) from midline 2-4 fingers

flex metacarpophalangeal joints

extend interphalangeal joint

innervate by deep branch lnar nerve c8-t1

Palmar interossei 1-3

P(AD) towards midline 2nd , 4th , and 5th fingers

flex metacarpophalangeal joints and extend IP joints

ulnar nerve innervation C8-T1

palmar brevis OINA

O: palmar aponerousis

I: skin of ulnar border

I: superficial palmer branch of ulnar nerve

A: deepens hollow of the hand, tightens hand.