378
UNIT 2
Covering, Support, and Movement of the Body
10
MUSCLE GALLERY
Table 10.16
Intrinsic Muscles of the Foot: Toe Movement and Arch Support
(Figure 10.25)
(continued)
MUSCLE
DESCRIPTION
ORIGIN (O) AND
INSERTION (I)
ACTION
NERVE
SUPPLY
MUSCLES ON SOLE OF FOOT—THIRD LAYER
Flexor hallucis brevis
Covers metatarsal I; splits
into two bellies—recall
flexor pollicis brevis of
thumb
O—lateral cuneiform
and cuboid bones
I—via two tendons onto
base of the proximal
phalanx of great toe;
each insertion tendon
contains a sesamoid
bone
Flexes great toe’s
metatarsophalangeal
joint
Medial plantar nerve
Adductor hallucis
Oblique and transverse
heads; deep to lumbricals
(recall adductor pollicis in
thumb)
O—from bases of
metatarsals II–IV
and from fibularis
longus tendon sheath
(oblique head); from
a ligament across
metatarsophalangeal
joints (transverse head)
I—base of proximal
phalanx of great toe,
lateral side
Helps maintain the
transverse arch of foot
;
weak adductor of great
toe
Lateral plantar nerve
(S
2
and S
3
)
Flexor digiti minimi brevis
Covers metatarsal V (recall
same muscle in hand)
O—base of metatarsal
V and tendon sheath of
fibularis longus
I—base of proximal
phalanx of toe 5
Flexes little toe at
metatarsophalangeal
joint
Lateral plantar nerve
MUSCLES ON SOLE OF FOOT—FOURTH LAYER (DEEPEST)
Plantar (3) and dorsal
interossei (4)
Similar to palmar and
dorsal interossei of hand
in locations, attachments,
and actions; however, these
muscles orient around the
second digit, not the third
See palmar and dorsal
interossei (Table 10.13)
See palmar and dorsal
interossei (Table 10.13)
Lateral plantar nerve
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