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fibularis

Fibularis is the anatomical term used for the muscles of the lateral compartment of the leg, commonly called the peroneal muscles. The core group comprises the fibularis longus and fibularis brevis, with the fibularis tertius present in some individuals. Collectively, these muscles act to move the foot at the ankle and stabilize the foot during gait.

Fibularis longus originates from the head and upper two-thirds of the lateral surface of the fibula. It

Fibularis brevis originates from the lower two-thirds of the lateral fibula. It inserts on the tuberosity of

Fibularis tertius, when present, originates from the distal anterior fibula and inserts on the dorsum of the

Innervation varies: the fibularis longus and brevis receive motor input from the superficial fibular (peroneal) nerve,

runs
behind
the
lateral
malleolus
and,
after
crossing
the
sole,
inserts
on
the
base
of
the
first
metatarsal
and
the
medial
cuneiform.
Its
primary
actions
are
eversion
of
the
foot
and
plantarflexion;
it
also
helps
support
the
transverse
arch
of
the
foot.
the
base
of
the
fifth
metatarsal.
It
primarily
assists
in
eversion
and
plantarflexion,
and
its
tendon
can
be
involved
in
avulsion
injuries
at
the
base
of
the
fifth
metatarsal.
base
of
the
fifth
metatarsal.
It
assists
in
dorsiflexion
and
eversion.
The
muscle
is
absent
in
a
portion
of
the
population.
while
the
fibularis
tertius
is
usually
supplied
by
the
deep
fibular
(peroneal)
nerve.
Blood
supply
comes
from
perforating
branches
of
the
fibular
artery.
Clinically,
injuries
to
these
tendons
or
nerve
pathways
can
affect
foot
eversion
and
ankle
stability.