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What are the articular surfaces of the carpometacarpal of the thumb?
trapezium with 1st metacarpal
What is the joint classification of the CMC, and what motions are available?
modified biaxial, saddle
- flex/ext (frontal plane; parallel to palm)
- abd/add (sagittal plane; perpendicular to palm)
- opposition/reposition (combo of flex, abd, rotation)
- small amt of rotation
What are the articulations of the metacarpophalangeal jt of the thumb?
1st metacarpal with proximal phalanx
What type of joint is the MCP of the thumb, and what mvmts are available?
What are the articulations of the interphalangeal joint of the thumb?
proximal phalanx with distal phalax
What type of joint is the IP of the thumb, and what motions are available?
- uniaxial hinge joint
What are the articulations of the carpometacarpal joint of the 2nd digit?
metacarpal with trapezoid
What are the articulations of the carpometacarpal joint of the 3rd digit?
metacarpal with capitate
What are the articulations of the carpometacarpal joint of the 4th digit?
What are the articulations of the carpometacarpal joint of the 5th digit?
metacarpal with hamate
most mobile out of digits 2-5
What type of joint are the carpometacarpal jts of the digits, and what motion do you get?
- nonaxial, irregular
more stability than mobility
What are the articulations of the metacarpophalangeal jts of the digits?
- metacarpal with proximal phalanx
What type of joint are the MCP joints of the digits, and what type of mvmt do you get?
- flex/ext (sagittal plane)
- abd/add (middle finger reference point and has no add.) (frontal plane)
Where are the interphalangeal joints f the digits located?
- between phalanges
- PIP, DIP
- thumb only has one, digits have 2
9 total in 1 hand, 18 in both
What type of joint are the IP joints, and what types of mvmts occur?
The proximal end of the phalanges are called what?
The distal end of the phalanges are called what?
What does the flexor retinaculum ligament do?
- holds flexor tendons to wrist
- spans ant. (palmar) side of wrist
What are the 2 divisions of the flexor retinaculum ligament?
- transverse carpal ligament
- palmar carpal ligament
What is the transverse carpal ligament for?
deeper, more distal
arches over the carpal bones forming a tunnel for the median n....if this tunnel compresses, you will end up with carpal tunnel syndrome (CTS)
What is the palmar carpal ligament for?
more proximal and superficial on ant. surface
prevents bow stringing of the flexor tendons (keeps them together)
What ligament holds the extensor tendons to the posterior surface of the wrist?
extensor retinaculum ligament
What ligament is on the posterior side of the hand and goes from the proximal phalanx to the base of the distal phalanx (an aponeurosis)?
extensor expansion ligament
What is the eminence on the meaty part of the palm by the thumb (palmar side)?
atrophies with carpal tunnel
What is the eminence on the meaty part of the palm by the pinky (palmar side)?
How do you find your anatomical snuffbox?
abduct and hyperextend thumb
What is the functional position (optimal strength and precision) of the hand?
- slight wrist extension
- MCPs and DIPs are slightly flexed
- thumb opposed
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