hyoid apparatus

(redirected from apparatus hyoideus)
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hy·oid ap·pa·ra·tus

veterinary anatomy term for hyoid bones, a modified portion of the ancestral branchial skeleton consisting of an articulated chain of bones extending from the mastoid region of the cranium on each side to the base of the tongue; in humans, it is reduced to a single bone, os hyoideum; in a typical mammal (the dog), it consists of a tympanohyoid cartilage attached to the cranium, followed by the stylohyoid, epihyoid, keratohyoid, basihyoid, and thyrohyoid bones.
Synonym(s): apparatus hyoideus


1. shaped like Greek letter upsilon (υ).
2. pertaining to the hyoid bone.

hyoid apparatus
the suspensory mechanism for the tongue and larynx. Consists of the single basihyoid, and the paired thyrohyoid, ceratohyoid, epihyoid and stylohyoid bones and the tympanohyoid cartilages.
hyoid bone
one or more of the bones of the hyoid apparatus, fused in some species (e.g. human) to form a horseshoe-shaped bone situated at the base of the tongue, just below the thyroid cartilage. See also Table 10.