KIN 100 - Hand (lecture 14)

Question 1

What are the five compartments of the hand

Answer 1

1. Thenar compartment
2. Adductor compartment
3. Hypothenar compartment
4. Central compartment
5. Interosseous compartments

Question 2

What muscles are located in the thenar compartment

Answer 2

1. Abductor pollicis brevis
2. Flexor pollicis brevis
3. Opponens pollicis

Question 3

What are the thenar muscles innervated by

Answer 3

the recurrent branch of the median nerve

Question 4

What muscle is located in the adductor compartment muscle

Answer 4

the adductor pollicis

Question 5

What is the innervation of the adductor compartment muscle

Answer 5

Deep branch of the ulnar nerve

Question 6

What is the function of the adductor compartment muscles

Answer 6

thumb adduction

Question 7

What plane does abduction and adduction of the metacarpophalangeal joint of the thumb occur in

Answer 7

sagittal plane

Question 8

Where does flexion and extension of the metacarpophalangeal and interphalangel joint of the thumb occur in

Answer 8

Front plane

Question 9

What muscles are located in the hypothenar compartment

Answer 9

1. Abductor digiti minimi brevis
2. Flexor digiti minimi brevis
3. Opponens digiti minimi

Question 10

What are the hypothenar muscles innervated by

Answer 10

the deep branch of the ulnar nerve

Question 11

what are the central compartment muscles

Answer 11

1. Tendons of long flexors (FDS and FDP)
2. Lumbricals

Question 12

Lumbricals

Answer 12

Proximal attachment: the tendons of FDP

Distal attachment: the extensor expansions of digits II - V

Innervations: 1st and 2nd by the median nerve, 3rd and 4th by the deep branch of ulnar nerve

Actions: flex metacarpophalangeal joint while extending interphalangeal joints (“bye-bye”)

Question 13

How many interossous compartment muscles are there

Answer 13

7 total: 4 dorsal interossei, and 3 palmar interossei

Question 14

Dorsal interossei

Answer 14

Proximal attachment: Adjacent sides of all 5 metacarpals

Distal attachment: Extensor expansions of digit II, III, IV

Innervation: Deep branch of ulnar nerve

Actions:
- Abduction of digits II, III, IV
- Assist the lumbricals to flex metacarpophalangeal joints while extending interphalangeal joints

Question 15

How are the dorsal interossei numbered

Answer 15

4 numbered 1-4 from lateral to medial

Question 16

How are the palmar interossei numbered

Answer 16

3 numbered 1-3 from lateral to medial

Question 17

Palmar interossei

Answer 17

Proximal attachment: Medial side of metacarpal II, lateral sides of metacarpals IV and V

Distal attachment: Extensor expansions of digits II, IV and V

Innervation: Deep branch of ulnar nerve

Actions:
- Adduction of digits II, iV and V (third digit cannot adduct)
- Assist the lumbricals to flex metacarpophalangeal joints while extending interphalangeal joints