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

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Unformatted text preview: Thumb Joints • Carpometacarpal (CMC) Joint of the thumb • Metacarpal phalangeal (MCP) joint of the thumb • Interphalangeal (IP) joint of the thumb Carpometacarpal (CMC) Joint of the thumb • 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 Metacarpal phalangeal (MCP) joint of the thumb • 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) Interphalangeal (IP) joint of the thumb • 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 Nerves of the Hand • Median – on the radial side • Ulnar – on the ulna side Nerves of the Hand Median Nerve 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 Nerves of the Hand Ulnar Nerve 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 • Deep head of the flexor pollicis brevis • Adductor pollicis Muscles of the Thumb Thenar eminence – made up of • Abductor pollicis brevis • Flexor pollicis brevis...
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10-29-09 - Thumb Joints • Carpometacarpal(CMC Joint of...

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