Hand Flashcards
movements possible at the digits
flexion/extension at MP/IP joints
Abduction and Adduction
movements possible at the thumb
flexion/extension
adduction/abduction
opposition
synovial sheaths cover the tendons of
flexor digitorum superficialis m
flexor digitorum profundus m
5th distal synovial sheath is continuous with
ulnar bursa
the anatomical snuffbox contains the
radial a as it enters the palm of the hand to become deep palmar arch
the superficial palmar arch originates form the
ulnar a
the deep palmar arch originates form the
radial a .
the princeps pollicis a to the thumb and the radialis indicies to the index finger both originate from
the deep palmar arch, a branch of the radial a
lumbricals insert onto
the extensor hood
lumbricals can assist in two motions of the digits
weak flexion and extension (because they insert onto the extensor hood)
the superficial innervation of the ulnar n includes these two digits
fourth and fifth digits up to the wrist (palmar and dorsal)
the cutaneous innervation of the radial n covers
the dorsal surface of the hand from wrist up to the distal phalange on 1st-3rd digits
fascia of wrist and hand
palmar aponeurosis
transverse carpal ligament
Dupuytren’s contracture
thickening of fibrous tissue underneath the skin of the palm
painless - associated with alcohol, diabetes, aging
see wrinkles at creases and when fingers are flexed
can reach point of restricting opening of hand
superficial muscles of the palm
abductor digiti minimi flexor digiti minimi brevis lumbricals adductor pollicis flexor pollicis brevis abductor pollicis brevis opponens pollicis
deep muscles of the hand (dorsal side)
opponens pollicis
adductor pollicis
opponens digiti minimi
midline of hand is which digit
3rd digit
palmar interosseous muscles perform what actions on which digits
PAD - adduction
2nd
4th
5th
dorsal interosseous muscles perform what actions on which digits
DAB - abduction
2nd digit - 1st and 2nd DAB
4th
5th
thenar group muscles
abductor pollicis brevis
opponens pollicis m
flexor pollicis brevis m
adductor pollicis m
origin/insertion of abductor pollicis brevis m
transverse carpal ligament, scaphoid, trapezium to radial base of proximal phalanx of thumb
action of abductor pollicis brevis
abduction of thumb (assists in opposition and extension
innervation of abductor pollicis brevis
recurrent branch of the median n
origin/insertion of opponens pollicis m
traperzium and transverse carpal ligament to metacarpal bone of thumb
action of opponens pollicis m
flexion of thumb metacarpal – opposition
innervation of opponens pollicis m
recurrent branch of median n
origin/insertion of flexor pollicis brevis m
trapezium, flexor retinaculum to proximal phalanx of thumb
action of flexor pollicis brevis m
flexes thumb at first MCP joint
innervation of flexor pollicis brevis m
superficial head: recurrent branch of median n
deep head: deep branch of ulnar n
flexor pollicis brevis m two heads and innervation
superficial head is innervated by recurrent branch of median n
deep head is innervate by the deep branch of ulnar n
origin/insertion of adductor pollicis m
transverse head: third metacarpal
oblique head: bases of 2 and 3 metacarpal and adjacent trapezoid and capitate bones to
proximal phalanx of thumb and ulnar sesamoid
actions of adductor pollicis m
adducts thumb at carpometacarpal joint
innervation of adductor pollicis m
deep branch of ulnar n
muscles within the hypothenar group and their innervation
abductor digiti minimi
flexor digiti minimi brevis m
opponens digiti minimi m
All innervated by ulnar n
origin/insertion of abductor digiti minimi m
pisiform to proximal phalanx of 5th digit
action of abductor digiti minimi
abducts 5th digit, assists in flexion
innervation of abductor digiti minimi
ulnar n
origin/insertion of flexor digiti minimi brevis m
hamulus (hook of hamate) and flexor retinaculum to proximal phalanx of 5th digit
action of flexor digiti minimi brevis m
flexes proximal phalanx of 5th digit
innervation of flexor digiti minimi brevis
ulnar n
origin/insertion of opponens digiti minimi m
hamulus (hook of hamate) and flexor retinaculum to medial 5th metacarpal
actions of opponens digiti minimi m
brings opposition to thumb
innervation of opponens digiti minimi m
ulnar n
deep intrinsic muscles of the hand
lumbrical m (4)
PAD
DAB
radial a gives rise to which arches
deep palmar arch
(princeps pollicis a, radialis indicis a)
superficial palmar arch of radial a
ulnar a gives rise to which arch
superficial palmar arch
–> common palmar digital a –> proper palmar digitial a
what two arteries make up the dorsal carpal arch
radial a and anterior interosseous a (from ulnar)
median n innervates the muscles of the thenar group except
adductor pollicis m
deep head of flexor pollicis brevis m
Lumbricals 1,2 innervated by what n
median n
the hypothenar group is innervated by which n
ulnar n
the intrinsic hand muscles are innervated by
the deep branch of the ulnar n
T/F the only innervation on dorsum of the hand is sensory
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