Hand

Question 0

dorsal interossei

Answer 0

O: adjacent sides of metacarpals
Ins: extensor expansion and base of proximal phalanx of digits 2-4
Inv: deep brach of the ulnar nerve
F: abduction of digits 2-4 at the MCP joint, flexes MCP while extending IP joints of digits 2-4

Question 1

Palmaris brevis

Answer 1

O: palmar aponeurosis and flexor retinaculum (transverse carpal ligament)
Ins: Dermis of skin on the medial margin of the hand
Inv: Superficial branch of the ulnar nerve
F: improves grip

Question 2

Palmar interossei

Answer 2

O: sides of metacarpals
Ins: Extensor expansion and base of proximal phalanx of digits 2,4, and 5
Inv: Deep branch of ulnar nerve
F: Adduction of digits 2,4, and 5 at the MCP joints, flexes MCP while extending IP joints of digits 2,4, and 5

Question 3

Adductor pollicis

Answer 3

O: Transverse head: metacarpal 3
Oblique head: capitate and bases of metacarpal 2 and 3
Ins: base of proximal phalanx and extensor expansion of thumb
Inv: Deep branch of the ulnar nerve
F: Adducts thumb

Question 4

Lumbricals

Answer 4

O: Tendons of flexor digitorum profundus
Ins: Extensor expansions of digits 2-5
Inv: Medial two: deep branch of the ulnar nerve
Lateral two: digital branches of the median nerve
F: Flexes MCP joints while extending IP joints of digits 2-5

Question 5

Opponenes Pollicis

Answer 5

O: Tubercle of trapezium and flexor retinaculum
Ins: Lateral margin of adjacent palmar surface of metacarpal 1
Inv: Recurrent branch of median nerve
F: Medially rotates the thumb

Question 6

abductor pollicis brevis

Answer 6

O: tubercles of scaphoid and trapezium and adjacent flexor retinaculum
Ins: Proximal phalanx and extensor hood of thumb
Inv: Recurrent branch of median nerve
F: Abducts thumb at MCP joint

Question 7

Flexor pollicis brevis

Answer 7

O: Tubercle of the trapezium and flexor retinaculum
Ins: Proximal phalanx of the thumb
Inv: Recurrent branch of median nerve
F: flexes thumb at MCP joint

Question 8

Opponens digiti minimi

Answer 8

O: Hook of hamate and flexor retinaculum
Ins: Medial aspect of metacarpal 5
Inv: Deep branch of ulnar nerve
F: laterally rotates metacarpal5

Question 9

Abductor digiti minimi

Answer 9

O: pisiform, pisohamate ligament, tendon of flexor carpi ulnaris
Ins: Proximal phalanx of digit 5
Inv: Deep branch of the ulnar nerve
F: Abducts digit 5 at MCP joint

Question 10

Flexor digiti minimi

Answer 10

O: Hook of hamate and flexor retinaculum
Ins: Proximal phalanx of digit 5
Inv: Deep branch of the ulnar nerve
F: Flexes digit 5 at MCP joint