ANATOMY
11
43.
Lumbricals
a.
are all supplied by ulnar nerve
F - ulna and median
b.
form proprioceptive bridges between flexors and
extensors
T
c.
aid in flexion of the terminal phalanx
F - they flex at MCP and extend IPJ pg 770 Moore, confusing in pg 120
Lasts
d.
oppose the actions of the interossei
F - same action
e.
arise from flexor digitorum superficialis
F– from 4 profundus tendons – lasts pg 112
f.
all are supplied by the ulnar nerve
F - 2 ulnar lumbricals supplied by ulna and 2 radial lumbricals supplied by
median nerve
g.
form a proprioceptive bride between flexors and
extensors
T – pg 120 Lasts
44.
Regarding the interossei of the hand, which is INCORRECT
(Moore 770) pg 832, 833NM
a.
arise from flexor retinaculum
F - No. From MC’s
b.
palmar cause abduction
F - No PAD DAB
c.
palmar have two heads of origin
F - No palmar are unipennate, dorsal Bipennate
d.
innervated by deep branch of ulnar nerve
T
e.
combined palmer and dorsal causes abduction
F - No assist lumbricals with flexion. PAD DAB
f.
when act together, flex the MCPJ
T - Yes and extend the IPJ
g.
They arise from the tendons of Flexor digitorum
Superficialis
F - No arise from the MC’s (lumbricals arise from tendons of FDP not FDS)
h.
Palmar interossei have two heads
F - NO. Dorsal are bipennate
i.
They abduct the fingers
T -. The dorsal ones do
j.
They are chiefly responsible for flexion of MCP
joints & extension of DIP joints
F - No. In conjunction with the lumbicals they do this ie NOT CHIEFLY
k.
insert into proximal phalanx
T - they do AND dorsal/extensor expansions
l.
insert into dorsal expansion
T - they do AND proximal phalanx AKA extensor expansion
m.
when act together, the dominant action is adduction
F - Dominant action when together with each other plus lumbricals is MCP
flexion and IP ext
45.
Palmar interosseii
a.
have two heads
F - No they are unipennate, dorsal are bipennate
b.
abduct the fingers
F - No PAD
c.
chiefly responsible for flexion MCPJ and extension PIPJ F - No. This is lumbricals p 833 M
