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11 Cards in this Set
- Front
- Back
Describe the compartments of the hand
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- 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 |
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What muscles make up the thenar compartment and what is there innervation?
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- Abductor pollicis brevis
- Flexor pollicis brevis - Opponens pollicis - Innervated by the Median nerve |
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Describe the muscles in the adductor compartment of the hand and their innervation
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- Adductor pollicis
- Innervated by the ulnar nerve |
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Describe the muscles in the hypothenar compartment of the hand and their innervation
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- Abductor digiti minimi
- Flexor digiti minimi - Opponens digiti minimi - Innervated by the ulnar nerve |
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Describe the muscles in the central compartment of the hand and their innervation
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- Lumbricals = median (lateral 2) and ulnar (medial 2) nerves (T1)
- Interossei = ulnar nerve (T1) |
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Label this diagram
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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 |
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Describe the features of the lumbricals
1. Origins 2. Insertion 3. Innervation 4. Action |
- 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) |
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What are the palmar interossei?
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- 3 muscles (NONE on thumb)
- PAD = adduct digits - Innervated by ulnar nerve C8 and T1 |
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What are the dorsal interossei?
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- 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 |
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Which intrinsic hand muscles are innervated by the ulnar nerve?
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1. Lumbricals 3 & 4
2. Interossei (palmar and dorsal) 3. Adductor pollicis 4. Hypothenar muscles |
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Which intrinsic hand muscles are innervated by the median nerve?
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1. Lumbrical 1 & 2
2. Thenar muscles (not adductor pollicis) |