sept 6 Flashcards
supinator, extensor indicis, abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus are all located in which layer of the posterior forearm?
deep
proximal attachments of the supinator
lateral epicondyle, supinator fossa/crest of the ulna
distal attachment of the supinator
anterior/lateral/posterior parts of proximal radius
action of supinator
supinator of radioulnar joints
proximal attachment of extensor indicis
posterior mid-distal forearm
distal attachment of extensor indicis
extensor expansion of the 2nd digit
action of extensor indicis
extends the 2nd digit
proximal attachment of abductor pollicis longus
posterior mid-distal forearm
distal attachment of abductor pollicis longus
base of MC1
action of abductor pollicis longus
CMC1 abduction
proximal attachment of extensor pollicis brevis
posterior mid-distal forearm
distal attachment of extensor pollicis brevis
base of the proximal phalanx of the thumb
actions of extensor pollicis brevis
extension of MCP1 and CMC1
proximal attachment of extensor pollicis longus
posterior mid-distal forearm
distal attachment of extensor pollicis longus
base of the distal phalanx of the thumb
actions of extensor pollicis longus
extension of IP1 and MCP1
where is the anatomical snuffbox
lateral aspect at the base of the thumb
what makes up the anterior border of the anatomical snuffbox?
abductor pollicis longus and extensor pollicis brevis
what makes up the posterior border of the anatomical snuffbox?
extensor pollicis longus
what bone is at the floor of the anatomic snuffbox?
scaphoid
opponens pollicis, abductor pollicis brevis, and flexor pollicis brevis are classified as what muscles?
thenar muscles
action of opponens pollicis
flex and rotate the thumb medially
action of abductor pollicis brevis
abduct the thumb, assists opposition
action of flexor pollicis brevis
thumb flexion and assists opposition
opponens digiti minimi, abductor digiti minimi, flexor digiti minimi brevis, and palmaris brevis are classified as what muscles?
hypothenar muscles
action of opponens digiti minimi
draws MC5 anteriorly and rotates it to oppose the thumb
action of abductor digiti minimi
abducts 5th finger
action of flexor digiti minimi brevis
flexes proximal phalanx of the 5th digit
actions of palmaris brevis
wrinkles the skin on medial palm, covers/protects ulnar nerve and artery
adductor pollicis, lumbricals, dorsal interossei, and palmer interossei are classified as what muscles?
deep
action of adductor pollicis
adducts the thumb
action of lumbricals
MCP flexion, IP extension
action of dorsal interossei
abducts digits
action of palmar interossei
adducts digits
which ribs are “typical”
2-10
what characteristics make a typical rib
head, neck, tubercle, shaft
rib structure with 2 facets (superior and inferior) that articulate with 2 vertebral bodies
typical rib head
rib structure between the head and the tubercle
neck
rib structure, articular facet that articulates with a TVP
tubercle
rib structure, has an angle and a costal groove for the costal nerve
shaft
what is the longest rib?
7
which ribs are atypical
1, 11, 12
what characteristics man an atypical rib
articulate with only 1 vertebral body
how does a rib shaft project?
posteriorly, inferiorly, and laterally until it gets to the rib angle, then curves anteriorly
the greatest change in the curvature of the rib
angle
structures on the vertebral bodies, most vertebra have superior and inferior, which articulate with the heads of ribs
costal facets
how are typical ribs numbered in relation to vertebral bodies?
superior costal facet articulates with the head of the rib of the same number
the articular facet on the tubercle of a typical rib articulates with what on the corresponding vertebral body?
transverse costal facet
how do the transverse costal facet-articular facet relationship correlate with typical rib/vertebra number
they are the same
structure of rib 1 where the anterior scalene muscle attaches
scalene tubercle
the grooves for the subclavian artery and vein are located on which rib?
rib 1
typical ribs articulate with what kind of facet on vertebral bodies?
demi-facets
atypical ribs articulate with what kind of facet on vertebral bodies
complete facets
