Wrist, Hand, & Joints Flashcards
what does the ulnar nerve innervate?
hypothenar muscles
3rd and 4th lumbricals
PAD
DAB
what does the deep branch of ulnar n. innervate?
adductor pollicis (transverse and oblique heads) deep portion of flexor pollicis brevis
what does the recurrent branch of median nerve innervate?
thenar muscles
1st and 2nd lumbricals
what does the superficial ulnar n. innervate?
palmaris brevis m.
where is the median nerve located?
what nerve is easily injured and superficially located?
deep to the palmar aponeurosis
recurrent branch of median n.
what is the origin of the superficial palmar arch?
what does the arch continue as?
ulnar a.
common digital a. then proper palmar digital a.
what is the primary source of the deep palmar arch?
what does the primary source continue as?
radial a.
princeps pollicus a. then radialis indicis a.
what makes up the thenar eminence from lateral to medial (anatomical position)
Abductor pollicis brevis
Flexor pollicis brevis (sup. and deep heads)
Opponens pollicis
Adductor pollicis (transverse and oblique heads) –> NOT PART OF THENAR EMINENCE
ALL FOR ONE AND
what makes up the hypothenar eminence lateral to medial?
Opponens digiti minimi
Flexor digiti minimi
Abductor digiti minimi
ONE FOR ALL
what is the innervation of thenar muscles?
blood supply?
recurrent branch of median n. (C8, T1)
radial a.
opponens pollicis action
oppose and medially rotate thumb
abductor pollicis brevis action
abduct thumb, aids opposition
flexor pollicis brevis action
innervations of deep head?
flex thumb
deep branch ulnar n.
adductor pollicis action
innervation
adduct thumb to lateral border
deep branch ulnar n.
hypothenar m. innervation
blood supply?
ulnar n. (C8, T1)
ulnar a.
Opponens digiti minimi action
bring 5th metacarpal ant. and rotates it to oppose thumb
flexor digiti minimi action
flex prox phalanx of 5th digit
abductor digiti minimi action
abduct 5th digit, flex prox phalanx
where are the 1st and 2nd lumbricals attached?
innervation?
blood supply
lateral 2 tendons of FDP
median n.
radialis indices and superficial palmar arch
where do the 3rd and 4th lumbricals attach?
innervation?
blood?
action?
medial 3 tendons of FDP
deep branch ulnar n.
sup. palmar arch and dorsal carpal arch
flex MCP joints, extend IP joints of digits 2-5
PADS action?
how many?
adduct digits 2,4,5
3
DABS action
how many
abduct 2,3,4 and assist lumbricals
4
innervation of PAD and DAB?
ulnar n.
shortening and thickening of palmar fascia that pulls the 4th and 5th digits into partial flexion is what?
Dupuytren’s Contracture
hereditary
what is tensosynovitis?
what causes it?
inflammation of tendon and synovial sheat
infections in digital synovial sheath
what is special about 5th digit tensosynovitis?
infection can spread into carpal tunnel and forearm, bc sheath continuous with ulnar bursa
what is the wrist joint called?
what is the articulation bw?
radiocarpal joint
radius bw scaphoid and lunate
what is the joint called bw prox carpal row and distal carpal row?
midcarpal joint
extension of the wrist joint involves what joints and %’s?
67% radiocarpal
33% midcarpal
flexion of the wrist joint involves what joints and %’s?
60% midcarpal
40% radiocarpal
what injury is common when extended?
flexed?
FOOSH
carpal fracture
degrees of abduction?
adduction?
15-25
30-45
what ligaments support the radiocarpal joint?
radial collateral
ulnar collateral
palmar radiocarpal
palmar radioulnar
what muscles are responsible for the power grip?
flexor digitorum profundus
flexor pollicus longus
