Muscles of the Hand

Question 0

Extensor Digiti Minimi

Answer 0

O: lateral epicondyle
I: extensor apenerosis
A: 5th digit extension
IN: Posterior interosseous nerve of the radial nerve (7-8)
AS: posterior interosseous artery from Ulnar artery

Question 1

Lumbricals

Answer 1

O:tendons of the flexor digitorum profundus
I: Extensor digitorum expansion: each muscles attaches distally to radial side of extensor digitorum
A: MCP flexion for digits 2-5; extension of IP joints when MCP held in extension
In: Median (8-1) for 2-3 and Ulnar (8-1) for 4-5
AS: deep palmar arch of the radial artery

Question 2

Opponens Pollicis

Answer 2

O: Tubercle of trapezium & flexor retinaculum
I: length of 1st metacarpal: lateral aspect and palmar surface
A: thumb opposition
IN: medial nerve (8-1)
AS: superficial palmar branches of the radial artery

Question 3

Flexor Pollicis Brevis

Answer 3

O: capitate, Trapezoid, and trapezium, their palmar ligaments and flexor retinaculum
I: thumb base of proximal phalanx
A: flexion of thumb and thumb opposition
IN: median nerve (8-1) ulnar nerve (8-1)
AS: superficial palmar branches of the radial artery

Question 4

Flexor Digit Minimi

Answer 4

O: transverse carpal ligament and hook of hamate
I: ulnar side of base of proximal phalanx of 5th digit
A: flexion of 5th digit
IN: ulnar nerve (8-1)
AS: deep palmar branches of the radial artery

Question 5

Adductor Pollicis

Answer 5

O: oblique head: base of 2&3 metacarpals, capitate and palmar ligaments of carpals. Transverse head: shaft of 3rd metacarpal of palmar aspect
I: 1st proximal phalanx on ulnar side
A: thumb adduction
IN: ulnar nerve (8-1)
AS: superficial palmar branch of the radial artery

Question 6

Opponens Digiti Minimi

Answer 6

O: Hook of hamate and flexor retinaculum
I: length of 5th metacarpal, ulnar aspect and palmar surface
A: opposition of 5th digit
IN: Ulnar nerve (8-1)
AS: deep palmar branches of the radial artery

Question 7

Abductor Digiti Minimi

Answer 7

O: Pisiform, tendons of flexor carpi ulnaris and pisohamte ligament
I: ulnar side of base of 5th proximal phalanx and the expansion hood
A: abduction of the 5th digit
IN: ulnar nerve (8-1)
AS: deep palmar branch of the radial artery

Question 8

Dorsal Interossei

Answer 8

O: base of metacarpals, each muscle has 2 heads from adjacent sides of metacarpals
I: dorsal extensor expansion (dorsal hood) and the base ot the proximal phalanges; 2-3 on radial and 4-5 on ulnar
A: finger abduction
IN: ulnar nerve (8-1)
AS: deep palmar arch of the radial artery

Question 9

Palmar interossei

Answer 9

O: Base of the 2, 4 & 5 metacarpals
I: dorsal expansion of the corresponding proximal phalanx
A: finger adduction
IN: ulnar nerve (8-1)
AS: deep palmar arch of the radial artery

Question 10

Extensor Indicis

Answer 10

O:Lower posterior ulna and interosseous membrane
I: Extensor expansion of the index finger
A: extension of the index finger
IN: posterior interosseous branch of radial nerve (7-8)
AS: posterior interosseous artery from Ulnar artery

Question 11

Extensor Digitorum Communis

Answer 11

O: lateral epicondyle
I: Base of middle and distal phalanges of digits 2-5 via the extensor aponeurosis
A: wrist extension, extension of MCP joints of digits 2-5
IN: Posterior interosseous branch of the radial nerve (7-8)
AS: posterior interosseous artery from Ulnar artery

Question 12

Flexor digitorum superficialis

Answer 12

O: humeroulnar head-medial epicondyle, ulnar collateral ligament, & ulnar coronoid process; radial head- upper half of anterior boarder of radius
I: tendons split and insert on the sides of the middle phalanx of each digit
A: flexion of PIP joints of digits 2-5, wrist flexion
IN: Median Nerve (8-1)
AS: muscular branches from the ulnar and radial arteries

Question 13

Flexor policis Longus

Answer 13

O: anterior radius and interosseous membrane
I: base of distal phalanx of the thumb
A: flexion of the thumb (IP flexion)
IN: anterior interosseous branch of medial nerve (8-1)
AS: muscular branches from the radial artery and the anterior interosseous artery from the ulnar artery

Question 14

Flexor Digitorum Profundus

Answer 14

O: upper 3/4 anterior ulna and interosseous membrane
I: base of distal phalanges of digits 2-5
A:Flexion of DIP; wrist flexion
IN: median nerve to digits 2-3 (8-1) Ulnar nerve to digits 4-5 (8-1)
AS: anterior interosseous artery from the ulnar artery and muscular branches from radial artery and ulnar artery

Question 15

Extensor Pollicis Brevis

Answer 15

O: distal posterior radius and interosseous membrane
I: base of proximal phalanx of thumb
A: extension of MP joint of thumb, radial deviation
IN: posterior interosseous branch of radial nerve (7-8)
AS: posterior interosseous artery from ulnar artery

Question 16

Extensor Pollicis Longus

Answer 16

O: middle posterior ulna and interosseous membrane
I: base of distal phalanx of thumb
A: extension of IP joint and radial deviation
IN: posterior interosseous branch of radial nerve (7-8)
AS: posterior interosseous artery from ulnar artery

Question 17

Palmaris Longus

Answer 17

O: medial epicondyle
I: apex of palmer aponeurosis
A: wrist flexion 
IN: median nerve (8-1)
AS: muscular branches from ulnar artery

Question 18

Abductor Pollicis Brevis

Answer 18

O: tubercle of scaphoid and trapezium, flexor retinaculum and tendons of abductor pollicis longus
I: Base of 1st proximal phalanx, extension mechanism of the thumb
A: thumb abduction and opposition
IN: median nerve (8-1)
AS: superficial palmar branches of the radial artery

Question 19

Abductor pollicis Longus

Answer 19

O: upper posterior radius and ulna interosseous membrane
I: base of 1st metacarpal and trapezium
A: extension of thumb abduction of CMC joint of thumb and radial deviation
IN: posterior interosseous branch of radial nerve (7-8)
AS: posterior interosseous artery from the Ulnar artery