Ns Ue Hand Muscles

Front 1

Describe the compartments of the hand

Back 1

- Intrinsic muscles of the hand are chiefly on the palmar aspect
- Thenar muscles in thenar compartments
- Hypothenar muscles in the hypothenar compartment
- Lumbricals in the central compartment
- Adductor pollicis in the adductor compartment

Front 2

What muscles make up the thenar compartment and what is there innervation?

Back 2

- Abductor pollicis brevis
- Flexor pollicis brevis
- Opponens pollicis
- Innervated by the Median nerve

Front 3

Describe the muscles in the adductor compartment of the hand and their innervation

Back 3

- Adductor pollicis
- Innervated by the ulnar nerve

Front 4

Describe the muscles in the hypothenar compartment of the hand and their innervation

Back 4

- Abductor digiti minimi
- Flexor digiti minimi
- Opponens digiti minimi
- Innervated by the ulnar nerve

Front 5

Describe the muscles in the central compartment of the hand and their innervation

Back 5

- Lumbricals = median (lateral 2) and ulnar (medial 2) nerves (T1)
- Interossei = ulnar nerve (T1)

Front 6

Label this diagram

Back 6

1.Abductor pollicis brevis
2. Flexor pollicis brevis 3.Opponens pollcis4&5.Adductor pollicis
6. Abductor digiti minimi
7. Flexor digiti minimi 
8. Opponens digiti minimi

Front 7

Describe the features of the lumbricals
1. Origins
2. Insertion
3. Innervation
4. Action

Back 7

- 4 Lumbricals on digits 2-5 (NOT thumb)
1. Origin = tendons of FDP
2. Insertion = extensor expansion
3. 1&2 supplied by median nerve C8 and T1, 3&4 supplied by deep branch of ulnar nerve C8 and T1
4. Actions = Flexion at the MCP joint and extension at the IP joint (opposite of this causes claw hand e.g. in ulnar nerve damage)

Front 8

What are the palmar interossei?

Back 8

- 3 muscles (NONE on thumb)
- PAD = adduct digits
- Innervated by ulnar nerve C8 and T1

Front 9

What are the dorsal interossei?

Back 9

- 4 muscles between metacarpals (1st is between 1st and 2nd metacarpal i.e. thumb and first digit)
- DAB = abduct digits
- Innervated by ulnar nerve C8 and T1
- Always check for 1st dorsal interossei wastage between thumb and forefinger as can show muscle wastage indicative of T1 stress of damage caused e.g. by superior lung tumours

Front 10

Which intrinsic hand muscles are innervated by the ulnar nerve?

Back 10

1. Lumbricals 3 & 4
2. Interossei (palmar and dorsal)
3. Adductor pollicis
4. Hypothenar muscles

Front 11

Which intrinsic hand muscles are innervated by the median nerve?

Back 11

1. Lumbrical 1 & 2
2. Thenar muscles (not adductor pollicis)