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Intrinsic Muscles of Hand (Thenar muscles (Opponens pollicis (I: lateral…
Intrinsic Muscles of Hand
Hypothenar Muscles
opponens digiti
O: hook of hamate and flexor retinaculum
I: medial border of 5th metacarpal
A: draws 5th metacarpal anterior and rotates it; bringing 5th digit into opposition with thumb
Deep branch of
ulnar nerve
(C8, T1)
flexor digiti minimi brevis
I:medial side of base of proximal phalanx of 5th digit
A: flexes proximal phalanx of 5th digit
O: hook of hamate and flexor retinaculum
Deep branch of
ulnar nerve
(C8, T1)
Abductor digiti minimi
I: medial side of base of proximal phalanx of 5th digit
A:abducts 5th digit; assists in flexion of its proximal phalanx
O: pisiform
Deep branch of
ulnar nerve
(C8, T1)
Thenar muscles
flexor pollicis brevis
deep head
I: lateral side of base of proximal phalanx of thumb
A: flexes thumb
O: Flexor retinaculum and tubercles of scaphoid and trapezium
deep branch of
ulnar nerve
(C8,T1)
superficial head
I: lateral side of base of proximal phalanx of thumb
A: flexes tumb
O:Flexor retinaculum and tubercles of scaphoid and trapezium
recurrent branch of
median nerve
(C8,T1)
Adductor Pollicis
Oblique Head
O: Base of 2nd and 3rd metacarpals, capitate and adjacent carpals
I: Medial side of base of proximal phalanx of thumb
A: adducts thumb towards lateral border of palm
deep branch of
ulnar nerve
(C8,T1)
Transverse Head
O: anterior surface of shaft of 3rd metacarpal
I: Medial side of base of proximal phalanx of thumb
A: adducts thumb towards lateral border of palm
deep branch of
ulnar nerve
(C8,T1)
Opponens pollicis
I: lateral side of 1st metacarpal
A: to oppose thumb. it draws 1st metacarpal medially to center of palm and rotates it medially
O: Flexor retinaculum and tubercles of scaphoid and trapezium
recurrent branch of
median nerve
(C8,T1)
abductor pollicis brevis
I: lateral side of base of proximal phalanx of thumb
A: abducts thumb; helps oppose it
O: Flexor retinaculum and tubercles of scaphoid and trapezium
recurrent branch of
median nerve
(C8,T1)
Short muscles
Dorsal interossei, 1st-4th
I: bases of proximal phalanges; extensor expansions od 2nd-4th digits
A: abducts 2nd-4th digits from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
O: adjacent sides of two metacarpals (as bipennate muscles)
deep branch of
ulnar nerve
(C8,T1)
Palmar interossei, 1st-3rd
I: Bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th digits
A: Adducts 2nd, 4th, and 5th digits toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints; extensor expansions of 2nd-4th digits.
O: Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
deep branch of
ulnar nerve
(C8,T1)
Lumbricals
1st and 2nd
I: lateral sides of extensor expansions of 2nd-5th digits
A: flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th digits.
O: Lateral two tendons of flexor digitorum profundus (as unipennate muscle)
median nerve
(C8-T1)
3rd and 4th
I: lateral sides of extensor expansions of 2nd-5th digits
A: flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th digits.
O: medial three tendons of flexor digitorum profundus (as bipennate muscles)
deep branch of
ulnar nerve
(C8,T1)