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What is the Fibrous band that spans the anterior wrist?
Flexor retinaculum
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What makes up the flexor retinaculum?
- palmar carpal ligament
- transverse carpal ligament (carpal tunnel syndrome)
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What does the Extensor Retinaculum Ligament do?
Holds extensor tendons close to wrist.
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What are extrinsic and intrinsic muscles?
origin of extrinsics attach proximal of wrist.
origins intrinsics proximal attachment at or distal to the carpals.
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Extrinsic muscles (anterior)
- • Flexor digitorumsuperficialis
- • Flexor digitorumprofundus
- • Flexor pollicislongus
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Extrinsic muscles (posterior)
- • Extensor digitorum
- • Extensor digiti minimi
- • Extensor indicis
- • Abductor pollicis longus
- • Extensor pollicis longus
- • Extensor pollicis brevis
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Intrinsic muscle groups
- •Thenar
- •Hypothenar
- •Deep Palm
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Thenar muscles
- • Flexor pollicis brevis
- • Abductor pollicis brevis
- • Opponens pollicis
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hypothenar muscles
- • Flexor digiti minimi
- • Abductor digiti minimi
- • Opponens digiti minimi
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Deep palm muscles
- • Adductor pollicis
- • Interossei
- • Lumbricales
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Name the joints of the hand
- •Carpometacarpal (CMC)
- •Metacarpophalangeal (MCP)
- •Proximal interphalangeal (PIP)
- •Distal interphalangeal (DIP)
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Flexor Digitorum Superficialis
A: MCP, PIP flexion
Assist wrist flexion
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Flexor Digitorum Profundus
A: MCP, PIP, DIP flexion, 2-5
Deep to Flexor Digitorum Superficialis
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Extensor Digitorum
A: MCP, PIP, DIP extension,2-5
Superficial
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Extensor Indicis
A: MCP, PIP, DIP extension,2nd finger
Deep
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Extensor Digiti Minimi
A:MCP, PIP, DIPextension,5th finger
Long narrow muscle, deep to extensor digitorumand extensor carpi ulnaris, Becomes superficial before crossing wrist
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What is medical term for thumb?
Pollicis
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Extrinsic thumb muscles include:
- • Flexor pollicis longus
- • Abductor pollicis longus
- • Extensor pollicis longus
- • Extensor pollicis brevis
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Flexor Pollicis Longus
A: Thumb CMC, MCP & IP flexion
Deep muscle
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Abductor Pollicis Longus
A: Thumb abduction
Deep on the posterior forearm muscle
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Extensor Pollicis Brevis
A: Thumb CMC & MCP extension
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Extensor Pollicis Longus
A: Thumb CMC, MCP, IP extension
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What is this?
•Depression formed with extension of thumb •Three muscle tendons
•Abductor pollicislongus
•Extensor pollicisbrevis
•Extensor pollicislongus(medial)
Anatomical Snuffbox
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