Mostly Finger Muscle O I A N

Question 1

Extensor Digitorum

Answer 1

O: Common extensor tendon from lateral epicondyle of humerus

I: Middle and distal phalanges of 2nd-5th fingers

A: Extend 2nd-5th fingers (MCP and IP joints)

N: Radial

Question 2

Extensor Indicis

Answer 2

O: Posterior surface of distal shaft of ulna and interosseous membrane

I: Tendon of the extensor digitorum at the 2nd MC

A: 2nd finger Extension (MCP joint), adduction assist

N: Radial

Question 3

Flexor Digitorum Superficialis

Answer 3

O: Common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna and shaft of radius

I: Sides of middle phalanges of 2nd-5th fingers (forming a V with tendons on each finger)

A: Flex 2nd-5th fingers (MCP and PIP joints)

N: Medial

Question 4

Flexor Digitorum Profundus

Answer 4

O: Anterior and medial surface of proximal three-quarters of ulna

I: Bases of distal phalanges of 2nd-5th fingers

A: Flex 2nd-5th fingers (MCP and DIP joints)

N: Medial and Ulnar

Question 5

Lumbricals of the hand

Answer 5

O: Surfaces of the flexor digitorum profundus tendons

I: Extensor aponeurosis on dorsal surface of phalanges

A: Extends 2nd-5th IP joints, Flex 2nd-5th MCP joints

N: 2nd-3rd - Median, 4th-5th - Ulnar

Question 6

Palmar Interossei

Answer 6

O: Base of 1st-2nd, 4th-5th metacarpals

I: Base of proximal phalange of the related finger, and extensor aponeurosis

A: Finger Adduction toward 3rd finger

N: Ulnar

Question 7

Dorsal Interossei

Answer 7

O: Shafts of all 5 metacarpals

I: Base of proximal phalange of the 2nd-4th fingers, and extensor aponeurosis

A: Abduct 2nd, 3rd, 4th fingers at MCP joints

N: Ulnar

Question 8

Abductor Digiti Minimi

Answer 8

O: Pisiform, flexor retinaculum

I: Base of proximal phalange of 5th finger, ulnar surface

A: Abduct 5th finger, assist in opposition toward thumb

N: Ulnar

Question 9

Flexor Digiti Minimi Brevis

Answer 9

O: Hook of hamate and flexor retinaculum

I: Base of proximal phalange of 5th finger, palmar surface

A: Flex 5th finger, assist in opposition toward thumb

N: Ulnar

Question 10

Opponens Digiti Minimi

Answer 10

O: Hook of hamate and flexor retinaculum

I: Shaft of 5th metacarpal

A: Opposition of 5th finger at CMP joint (as when cupping your hand)

N: Ulnar

Question 11

Short N Sweet: Finger Flexion

Answer 11

• Flexor digitorum profundus
• Flexor Digitorum Superficialis
• Flexor Digiti Minimi
• Interossei
• Lumbricals

Question 12

Short N Sweet: Finger Extension

Answer 12

• Extensor Digitorum
• Extensor Indicis
• Extensor Digiti Minimi

Question 13

Short N Sweet: Finger Abduction

Answer 13

• Dorsal Interossei

- Abductor Digiti Minimi

Question 14

Short N Sweet: Finger Adduction

Answer 14

-Palmar Interossei