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10-29-09 - Thumb Joints Carpometacarpal(CMC Joint of the...

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Thumb Joints
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Carpometacarpal (CMC) Joint of the thumb Metacarpal phalangeal (MCP) joint of the thumb Interphalangeal (IP) joint of the thumb
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Carpometacarpal (CMC) Joint of the thumb
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Classification : diarthrodial, saddle, axial Articulating surfaces : trapezium, trapezoid, and base of the 1 st metacarpal Degrees of freedom of motion : 2+ Motions : CMC flexion/extension; CMC abduction/adduction; opposition Comments : CMC joint of the thumb is more like a specialize MC joint of the finger
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Metacarpal phalangeal (MCP) joint of the thumb
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Classification : diarthrodial, ginglymus, hinge, axial Articulating surfaces : head of the 1 st MC with the base of the 1 st proximal phalanx Degrees of freedom of motion : 1 Motions : MCP flexion/extension Comments : The MCP joint of the thumb is more like a proximal interphalangeal joint of the fingers (PIP)
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Interphalangeal (IP) joint of the thumb
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Classification : diarthrodial, ginglymus, hinge, axial Articulating surfaces : head of the proximal phalanx with the base of the distal phalanx Degrees of freedom of motion : 1 Motions : IP flexion/extension
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Nerves of the Hand
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Median – on the radial side Ulnar – on the ulna side
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Nerves of the Hand Median Nerve
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The median nerve supplies : All muscles of the thumb EXCEPT for the deep head of the flexor pollicis brevis Muscles supplied by the median nerve are: Abductor pollicis brevis Flexor pollicis brevis superficial head Opponens pollicis 1 st and 2 nd lumbricals
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Nerves of the Hand Ulnar Nerve
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The ulnar nerve supplies all muscles EXCEPT those of the thenar eminence;– includes all the muscles of the pinky, those that cross the palm, and all the interossei The ulnar nerve supplies: Abductor digiti minimi Flexor digiti minimi Opponens digiti minimi 3 rd and 4 th lumbricals Dorsal and palmar interossei
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Deep head of the flexor pollicis brevis Adductor pollicis Muscles of the Thumb
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Thenar eminence – made up of Abductor pollicis brevis Flexor pollicis brevis Opponens pollicis
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