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Hand Bones Joints Muscles Vessels & Nerves
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Muscles of the hand Extrinsic muscles - flexors of fingers - extensors of fingers - long muscles of the thumb Intrinsic muscles - thenar region - hypothenar region - intermediate region
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Extrinsic muscles flexors of fingers: - Flexor digitorum superficialis - Flexor digitorum profundus extensors of fingers: - Extensor digitorum - Extensor digiti minimi - Extensor indicis long muscles of the thumb: - Flexor pollicis longus - Abductor pollicis longus - Extensor pollicis brevis - Extensor pollicis longus
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Intrinsic muscles Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi Intermediate region: - Lumbricals - Adductor pollicis - Interossei
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Extrinsic muscles (flexors)
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Long flexors of fingers
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Flexor tendon insertion
Action: flexion in MP&IP joints How can we flex just MP?
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Muscles of the Anterior Compartment of the Forearm
Superficial: Pronator Teres Flexor Carpi Radialis Palmaris Longus Flexor Digitorum Superficialis Flexor Carpi Ulnaris Deep: Flexor Digitorum Profondus Flexor Pollicis Longus Pronator Quadratus
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Extrinsic muscles (extensors)
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Extrinsic muscles
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Anatomic snuffbox
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Anatomic Snuffbox Extensor pollicis brevis/Abductor pollicis longus
Extensor pollicis longus Scaphoid Radial a
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Extensor tendon insertion
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Superficial: Deep: Post.Compartment m. Brachioradialis
Extensor Carpi Radialis Longus Extensor Carpi Radialis Brevis Extensor Digitorum Extensor Digiti Minimi Extensor Carpi Ulnaris Anconeus Deep: Supinator Abductor Pollicis Longus Extensor Pollicis Brevis Extensor Pollicis Longus Extensor Indicis
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Intrinsic muscles Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi Intermediate region: - Lumbricals - Adductor pollicis - Interossei
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Intrinsic muscles
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henar & hypothenar muscles
Insertion: 1- deep attaches to Metacarpal 2- superficial to P. Phalanx origin: 1. flex. retinaculum
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thenar & hypothenar muscles
2. Origin of thenar & hypothenar muscles Trap. tubercle Ham. hook Scapho. tubercle Pisifo.
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Intrinsic muscles Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi Intermediate region: - Adductor pollicis -Lumbricals -Interossei
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Intermediate region Adductor pollicis
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Intermediate region Dorsal Interossei Function: Dab
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Intermediate region Palmar Interossei Function: Pad
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Intermediate region lumbricals Function: MP flex. !
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Intermediate region muscles insertion: Extensor hood
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Extensor & flexor mechanism
The extensor mechanism is the name for the tendon complex (green) that extends the finger. It is much more complex than the flexor mechanism (brown). The two systems interact in a complex manner.
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Tendon insertion Action: pad/dab
Function: MP flex. Action: pad/dab Flexion in MP and extension in IP joints How can we flex just MP?
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