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24 Cards in this Set
- Front
- Back
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Phalanges |
3 per finger- Distal, Middle and Proximal 2 for thum- proximal and distal Structure: Base Shaft Head |
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Palmar Aponeurosis |
Thickened Deep fascia Insertion of palmaris longus Anchored into flexor retinaculum proximally and fibrous sheaths of digits distally Present even if palmaris longus is missing Of little function in humans |
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Flexor Retinaculum |
Holds flexor muscle tendons in place Also has little function in humans |
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Palmaris Brevis |
Small thin superficial muscle Connects skin to the palmar aponeurosis Covers the ulnar nerve and artery |
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Extensor Retinaculum |
Prevents bowstringing of tendons when hand is extended at the wrist joint |
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Fibrous Digital and Synovial Sheaths |
Allows tendons to slide over each other during finger movement. 2 parts: Synovial sheath-helps tendons slide Fibrous digital sheath- holds tendons in place |
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Anular and Cruciform Ligaments |
Cruciform ligaments (4 per digit) weak Anular ligaments (5 per digit) are strong Prevents tendons of FDS and FDP from bowstringing when digit is flexed. |
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Vinculum (vincula) Breve & Longa |
Bands that connect tendons of FDS and FDP to phalanges. Small blood vessels traverse through to supply to long tend. helps hold flex. tendons on digits |
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Thenar Fascial Compartment of Hand |
Abductor pollicis brevis Flexor Pollicic brevis Opponens pollicis *Innervated by Median Nerve |
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Adductor Fascial Compartment of Hand |
Adductor Pollicis *Innervated by Ulnar Nerve |
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Hypothenar Fascial Compartment of the Hand |
Abductor digiti minimi Flexor Digiti Minimi Opponens digiti mini *Innervated by Ulnar Nerve
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Central Fascial Compartment of the Hand |
Flexor tendons & sheaths Lumbricals Arteries and nerves *Innervated by Ulnar and Median Nerves |
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Interossei |
Dorsal Palmar *innervated by Ulnar N |
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Mid Palmar space |
Potential space |
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Hypothenar Muscles |
Opponens Digiti minimi Flexor Digiti Minimi Abductor Digiti Minimi |
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Thenar & Adductor Muscles |
(Adductor Pollicis transverse head) Abductor pollicis Brevis (Adductor pollicis, oblique head) Flexor Pollicis Brevis Oponens Pollicis |
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4 Lumbricals |
All lumbricals insert laterally into exten. expansions Medial 2 lumbricals origin frm 2tendons of FDPLateral 2 lumbricals originate from 1 tendon of FDP |
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4 Dorsal Interossei Muscles |
Dorsal interosseous muscles ABduct (DAB) Thumb and little finger have no dorsal interossei muscles because they already have their own abductors |
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3 Palmar Interossei |
Palmar inter musc. ADduct (PAD) Middle digit has none cause it is the "center line" of adduction. Thumb has none cause it has adductor pollicis |
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Median N of hand |
Enter through carpal tunnel innervates: -the thenar muscles (recurrent br.) -lumbricals 1-2 -Skin of lateral palm and 3 1/2digits |
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Ulnar N of hand |
Runs superficial to flexor retinaculum, then becomes: Deep branch- dives deeply to innervate remaining hand muscles Superficial br. innervates skin of medial hand (1 1/2 digits) |
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Radial N of hand |
Innervates no muscles in hand, but its superficial branch supplies skin of lateral dorsum and proximal 3 1/2 digits |
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Cutaneous Innervations of the Hand |
Median N-lateral pal and 3 1/2 digits ulnar N- medial hand, 1 1/2 digits Radial N- lateral dorsum and proximal 3 1/2 digits |
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Claw Hand |
Ulnar N lesion @ wrist Paralysis of lumbricals & interosseous muscles to digits 4 & 5 and loss of intrinsic muscle elasticity Hyperextension of MP & partly flexed IP joints |
