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48 Cards in this Set
- Front
- Back
What are the groups of muscles in the hand? |
Thenar Hypothenar Lumbricals Interossei (Dorsal & Palmar) Other: Palmaris Brevis, Adductor Pollicis |
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Name are the thenar muscles in the hand |
Opponens pollicis Abductor pollicis brevis Flexor pollicis brevis |
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What is the function of the thenar muscles as a group? |
Fine movements of the thumb |
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What are the attachments of opponens pollicis? |
Origin: Tubercle of the trapezium and associated flexor retinaculum
Insertion: Lateral margin of the shaft of the metacarpal of the thumb |
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What are the actions of opponens pollicis? |
Opposes the thumb via medial rotation and flexion of the metacarpal on the trapezium (CMCJ) |
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What is the innervation of opponens pollicis? |
Recurrent Branch of the Median Nerve |
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What is the arterial supply of opponens pollicis? |
Superficial Palmar Branch of the Radial Artery |
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What are the attachments of abductor pollicis brevis? |
Origin: Tubercles of the scaphoid and trapezium, and from the associated flexor retinaculum
Insertion: Lateral side of the base of the proximal phalanx of the thumb |
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What are the actions of abductor pollicis brevis? |
Abducts the thumb at the CMCJ |
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What is the innervation of abductor pollicis brevis? |
Recurrent Branch of the Median Nerve |
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What is the arterial supply of abductor pollicis brevis? |
Superficial Palmar Branch of the Radial Artery |
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What are the attachments of the flexor pollicis brevis? |
Origin: Superficial Head: Flexor Retinaculum Deep Head: Trapezium and Capitate
Insertion: Base of the proximal phalanx of the thumb |
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What are the actions of flexor pollicis brevis? |
Flexes the thumb at the MCPJ |
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What is the innervation of flexor pollicis brevis? |
Superficial Head: Recurrent Branch of the Median Nerve Deep Head: Deep Branch of the Ulnar Nerve |
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What is the arterial supply of flexor pollicis brevis? |
Superficial Palmar Branch of the Radial Artery |
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Name the hypothenar muscles |
Opponens digiti minimi Abductor digiti minimi Flexor digiti minimi brevis |
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What are the attachments of opponens digiti minimi? |
Origin: Hook of hamate and associated flexor retinaculum
Insertion: Medial margin of the 5th metacarpal |
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What are the actions of opponens digiti minimi? |
Opposition of the little finger via rotation of the metacarpal towards the palm |
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What is the innervation of opponens digiti minimi? |
Deep Branch of the Ulnar Nerve |
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What is the arterial supply of opponens digiti minimi? |
Ulnar Artery |
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What are the attachments of abductor digiti minimi? |
Origin: Pisiform
Insertion: Base of the proximal phalanx of the little finger on the ulnar side |
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What are the actions of abductor digiti minimi? |
Abduction of the little finger |
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What is the innervation of abductor digiti minimi? |
Deep Branch of the Ulnar Nerve (C8-T1) |
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What is the arterial supply of abductor digiti minimi? |
Ulnar Artery |
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What are the attachments of flexor digiti minimi brevis? |
Origin: Hook of hamate and adjacent flexor retinaculum
Insertion: Base of the proximal phalanx of the little finger |
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What are the actions of flexor digiti minimi brevis? |
Flexion of the little finger at the MCPJ |
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What is the innervation of flexor digiti minimi brevis? |
Deep Branch of the Ulnar Nerve |
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What is the arterial supply of flexor digiti minimi brevis? |
Ulnar Artery |
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What are the function and actions of the lumbricals of the hand as a group? |
Linking the extensor tendons to the flexor tendons
Flexion at the MCPJs and extension at the PIPJs &DIPJs of the fingers (not the thumb) |
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What are the attachments of the lumbricals of the hand? |
Lateral 2 Lumbricals: Unipenate (Middle, Index) Origin: Tendon of the flexor digitorum profundus of the respective digit Insertion: Extensor hood on the radial side of the proximal phalanx of the digit
Medial 2 Lumbricals: Bipenate (Little, Ring) Origin: Tendon of the flexor digitorum profundus of the respective digit and the digit lateral to it (ie: little + ring; ring + middle) Insertion: Extensor hood on the radial side of the proximal phalanx of the digit |
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What is the innervation of the lumbricals of the hand? |
Lateral Two: Palmar Digital Nerve from the Median Nerve (Middle, Index)
Medial Two: Deep Branch of the Ulnar Nerve (C8-T1) (Little, Ring) |
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What is the arterial supply of the lumbricals of the hand? |
Superficial Palmar Arterial Arch |
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What are the attachments of the dorsal interossei? |
4 Dorsal Interossei, each with 2 heads
Origin: Lateral and medial surfaces of two adjacent metacarpals
Insertion: Lateral 2: Lateral side of the extensor hood and proximal phalanx of the index and middle fingers respectively Medial 2: Medial side of the extensor hood and proximal phalanx of the middle and ring fingers respectively
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What are the actions of the dorsal interossei? |
Abduct the fingers at the MCPJs
Assist the lumbricals in flexion and MCPJ joints and extension at the IPJs |
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What is the innervation of the dorsal interossei? |
Deep Branch of the Ulnar Nerve |
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What is the arterial supply of the dorsal interossei? |
Dorsal & Palmar Metacarpal Arteries |
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What are the attachments of the palmar interossei? |
3 Palmar Interossei
Lateral 1: Origin: Medial surface of the metacarpal of the index finger Insertion: Medial aspect of the base of the proximal phalanx and extensor hood of the index finger
Medial 2: Origin: Lateral surfaces of the metacarpals of the little and ring fingers Insertion: Lateral aspect of the proximal phalanx and extensor hood of the same finger |
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What are the actions of the palmar interossei? |
Adduct the fingers at the MCPJs
Assist the lumbricals in flexion and MCPJs and extension at the IPJs |
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What is the innervation of the palmar interossei? |
Deep Branch of the Ulnar Nerve |
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What is the arterial supply of the palmar interossei? |
Palmar Metacarpal Arteries |
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What are the attachments of the palmaris brevis? |
Origin: Palmar aponeurosis and flexor retinaculum overlying the hypothenar eminence
Insertion: Dermis of the skin on the medial margin of the hand |
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What are the actions of the palmaris brevis? |
Tightens the palmar aponeurosis and pulls the skin of the medial side of the hand centrally
-> deepens the curvature of the hand, improving grip |
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What is the innervation of the palmaris brevis? |
Superficial Branch of the Ulnar Nerve |
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What is the arterial supply of the palmaris brevis? |
Ulnar Artery |
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What are the attachments of the adductor pollicis? |
Origin: Transverse Head: Shaft of the palmar surface of the 3rd metacarpal Oblique Head: Capitate, Bases of metacarpals 2-3
Insertion: Base of the proximal phalanx of the thumb |
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What are the actions of the adductor pollicis? |
Adduction of the thumb at the CMCJ |
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What is the innervation of the adductor pollicis? |
Deep Branch of the Ulnar Nerve |
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What is the arterial supply of the adductor pollicis? |
Deep Palmar Arterial Arch |