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sternohyoideus

The sternohyoideus, commonly called the sternohyoid, is a paired infrahyoid muscle of the neck. It belongs to the group of muscles that anchor the hyoid bone and larynx during swallowing and speech. In humans it is a slender strap muscle located anterior to the carotid sheath.

Origin and insertion: The sternohyoideus typically arises from the posterior surface of the manubrium sterni and

Innervation and vascular supply: The muscle is innervated by fibers of the ansa cervicalis, usually from C1

Function: Contraction of the sternohyoideus depresses the hyoid bone and, consequently, the larynx. This action complements

Comparative anatomy and clinical notes: In different vertebrates, the sternohyoideus can show variations in origin, insertion,

See also: infrahyoid muscles, sternothyroideus, thyrohyoideus, omohyoideus.

the
medial
end
of
the
clavicle.
It
inserts
on
the
inferior
aspect
of
the
body
of
the
hyoid
bone,
near
its
midline.
Its
exact
attachments
can
vary
somewhat
among
individuals
and
species.
to
C3.
Its
arterial
supply
commonly
comes
from
branches
of
the
inferior
thyroid
artery,
with
additional
contributions
from
nearby
vessels
in
some
individuals.
other
infrahyoid
muscles
during
swallowing
and
helps
stabilize
the
hyoid
apparatus.
and
relative
size,
reflecting
adaptations
of
the
hyolaryngeal
apparatus.
In
clinical
contexts,
involvement
of
the
infrahyoid
group
can
affect
swallowing
mechanics,
but
the
sternohyoideus
is
usually
considered
in
the
broader
evaluation
of
neck
muscle
function
rather
than
in
isolation.