Hand and Wrist Anatomy Flashcards
pisiform is a sesamoid bone in which tendon?
flexor carpi ulnaris
Sesamoid bones in the thumb act as what?
tunnel
what is the key articular bone in the wrist?
radius
3 parts of the scaphoid, where is it most likely fractured?
articular
waist (common fracture)
tubercle
what is the purpose of the retinaculum?
retains tendons to prevent bridging
what tendon in the wrist is not held under the retinaculum?
palmaris longus
the anatomical snuff box, what is proximal? what is the floor?
proximal: radioal styloid
floor: scaphoid
When do carpal bones start to ossify?
age 2
which bones ossify first? small or large?
large ones like the capitate
2 joints of the wrist?
radio carpal
intercarpal condylar
What are the biaxial movements?
flex/ect
rad/uln deviation
rotation at wrist?
Nope
where is the synovial ellipsoid joint?
radiocarpal joint
Why is radial deviation less than ulnar deviation?
radial deviation is blocked by radial styloid process?
Why is flexion more than extension?
blocked by distal radius
what’s the only tendon that attaches to carpal bones?
flexor carpi ulnaris
what is the most commonly subluxed carpal?
lunate
consequence of scaphoid fracture?
avascular necrosis due to fracture at waist and lack of blood supply
colles fracture?
fracture at distal radial head making dinner fork deformity
what kind of joint is the carpometacarpal joint of the thumb? what does it allow?
saddle joint
allows opposition
what are the movements allowed in the interphalangeal joints?
flex and ext only
movements allowed in metacarpophalangeal joints?
flex/ext
abd/add
what is the deep transverse metacarpal ligaments? where does it not attach?
limits finger abduction
doesn’t attach to thumb
What is the volar and dorsal plate?
fibrocartilaginous plate to expand surface area for articulation
Collateral ligaments of phalanges are taut when?
in flexion
What is damaged in:
swan neck
boutonniere
Swan neck: volar plate
boutonniere: dorsal plate
