This sumarry is only for the muscles of the hand (slides: 14-33) please refer to the first 13 slide when studying.
For The innervation of these muscles its easier to memorize them from the last paragraph in the last page
Muscle Origin Insertion Nerve Action Image
1st and 2nd, Flexmetacarpoph (lateral two) alangeal (MP) Extensor Tendons of flexor median nerve; joints & extend Lumbricals expansion of Digitorum 3rd and 4th interphalangeal (4 muscles) medial four profundus medial deep (IP) joints of fingers branch of ulnar fingers except nerve thumb
-First arises from Proximal base of 1st phalanges of metacarpal thumb and index, Palmar adduct fingers - remaining three ring, and little Deep branch of Interossei toward center of from anterior fingers and ulnar nerve (4 muscles) third finger surface of shafts dorsal extensor of 2nd, 4th, and expansion of 5th metacarpals each finger . Proximal phalanges of index, middle, and ring fingers Contiguous sides abduct fingers Dorsal Interossei and dorsal Deep branch of of shafts of from center of (4 muscles) extensor ulnar nerve metacarpal bones third finger expansion (1st:index\ 2nd,3rd:middle \ 4th:ring) Both palmar and dorsal: -Flex metacarpophalangeal joints -Extend interphalangeal joints
Simultaneous flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of a digit are essential for the fine movements of writing, drawing, threading a needle, etc. The Lumbricals and interossei have long been accepted as not only primary agents in flexing the metacarpophalangeal joints but also in extending the interphalangeal joints via their attachments to the dorsal digital expansions Muscles of the Thumb
Abductor Pollicis Abduction of Median nerve Brevis thumb
Flexes Flexor Pollicis metacarpophalan Median nerve Brevis geal joint of thumb
Not required “read only” Just know that the insertion is in base of proximal phalanx Pulls thumb Opponens medially and Median nerve Pollicis forward across palm
Deep branch of Adduction of Adductor Pollicis ulnar nerve thumb
- The first three of these muscles form the Thenar Eminence.
Muscles of the little finger
Abductor digiti Deep branch of Abducts little minimi ulnar nerve finger
Flexor digiti Deep branch of Flexes little finger minimi brevis ulnar nerve
Not required “read only” Refer to the slides if you are interested
Pulls 5th Opponens digiti Deep branch of metacarpal minimi ulnar nerve forward as in cupping the palm
Corrugates skin Superficial branch Palmaris Brevis to improve grip of of ulnar nerve palm
Together these muscles form Hypothenar Eminence
Movments of the thumb and the little finger:
Muscles innervation In total:- Median nerve Ulnar nerve
gives 5 muscles:- gives 15 muscles:-
-Superficial : one muscle (palmaris brevis) (thenar eminence (3 muscles) + 1st & 2nd lumbrical) -Deep : 14 muscle ( hypothenar eminence (3 muscles) \8 muscles the palmar and dorsal interossei,\ the 3rd and 4th lumbrical muscles, adductor pollicis muscle.
Done by Waseem Aldemeri, from Dr Amjad Shatarat’s slides