1 Structure IDs- Hand (Muscles)

Question 1

Abductor digiti minimi (C8-T1)

Answer 1

Attachments: from the pisiform to the ulnar side of the base of the proximal phalanx of the 5th digit

Actions: abducts 5th digit

Innervation: deep branch of the ulnar nerve

Question 2

Abductor pollicis brevis (C6-T1)

Answer 2

Attachments from the transverse carpal ligament to the radial side of the base of the proximal phalanx of the thumb

Actions: abducts thumb

Innervation: recurrent branch of the median nerve

Question 3

Adductor pollicis (C8-T1)

Answer 3

Attachments: from the capitate and the 2nd and 3rd metacarpals (oblique head) and the palmar aspect of the 3rd metacarpal (transverse head) to the base of the proximal phalanx of the thumb

Actions: adducts the thumb

Innervation: deep branch of the ulnar nerve

Question 4

Dorsal interossei (C8-T1)

Answer 4

Attachments: from the adjacent sides of the metacarpals to the proximal phalangeal bases and dorsal digital expansions of digits 2-4

Actions: abducts (metacarpophalangeal), flexes (metacarpophalangeal) and extends (interphalangeal) digits 2-4

Innervation: deep branch of the ulnar nerve

Question 5

Flexor digiti minimi brevis (C8-T1)

Answer 5

Attachments: from the hamate to the ulnar side of the base of the proximal phalanx of the 5th digit

Actions: flexes (metacarpophalangeal) 5th digit

Innervation: deep branch of the ulnar nerve

Question 6

Flexor pollicis brevis (superficial head C6-T1; deep head C8-T1)

Answer 6

Attachments: from the transverse carpal ligament and trapezium to the radial side of the base of the proximal phalanx of the thumb; deep head blends with the opponens pollicis

Actions: flexes (metacarpophalangeal) thumb

Innervation: recurrent branch of the median nerve (superficial head) and deep branch of the ulnar nerve (deep head)

Question 7

Lumbricals (C7-T1)

Answer 7

Attachments: from the tendons of the flexor digitorum profundus to the radial side of the dorsal digital expansions of digits 2-5

Actions: flexes metacarpophalangeal and extends interphalangeal joints of digits 2-5

Innervation: deep branch of the ulnar nerve (3rd and 4th; C8-T1) and median nerve (1st and 2nd; C7-8-T1)

Question 8

Opponens digiti minimi (C8-T1)

Answer 8

Attachments: hook of the hamate to the ulnar margin of the shaft of the 5th metacarpal

Actions: opposition of the 5th digit to the thumb

Innervation: deep branch of the ulnar nerve

Question 9

Opponens pollicis (C6-T1)

Answer 9

Attachments: from the transverse carpal ligament and trapezium to the palmar surface of the 1st metacarpal

Actions: opposition of thumb to the 5th digit

Innervation: recurrent branch of the median nerve

Question 10

Palmar interossei (C8-T1)

Answer 10

Attachments: from the palmar aspects of metacarpals 2, 4 and 5 to the dorsal digital expansions of digits 2, 4 and 5

Actions: adducts (metacarpophalangeal), flexes (metacarpophalangeal) and extends (interphalangeal) digits 2, 4 and 5

Innervation: deep branch of the ulnar nerve

Question 11

Transverse carpal ligament

Answer 11

Function: prevents bowstringing of the tendons of the flexor pollicis longus, flexor digitorum superficialis and flexor digitorum profundus muscles

Attachments: from the pisiform hook of the hamate to the scaphoid and trapezium

Question 12

Collateral ligaments of the metacarpophalangeal joints

Answer 12

Function: stabilizes metacarpophalangeal joints

Attachments: from the head of the metacarpals to base of adjacent proximal phalanx