zygomatic arch

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arch

 [ahrch]
a structure of bowlike or curved outline.
abdominothoracic arch the lower boundary of the front of the thorax.
arch of aorta (aortic arch) the curving portion between the ascending aorta and the descending aorta, giving rise to the brachiocephalic trunk, the left common carotid artery, and the left subclavian artery.
aortic a's paired vessels arching from the ventral to the dorsal aorta through the branchial clefts of fishes and amniote embryos. In mammalian development, arch 1 largely disappears but may contribute to the maxillary and external carotid arteries; the dorsal portion of arch 2 persists and forms stems of the stapedial arteries; arch 3 joins the common to the internal carotid artery; arch 4 becomes the arch of the aorta and joins the aorta and subclavian artery; arch 5 disappears; and arch 6 forms the pulmonary arteries and, until birth, the ductus arteriosus.
branchial a's
four pairs of arched columns in the neck region of some aquatic vertebrates that bear the gills.
Branchial arches. From Dorland's, 2000.
pharyngeal arches.
dental arch either of the curving structures formed by the crowns of the upper and lower teeth in their normal positions (or by the residual ridge after loss of the teeth); they are called the inferior dental arch (see mandibular arch) and the superior dental arch (see maxillary arch).
a's of foot the longitudinal and transverse arches of the foot. The longitudinal arch comprises the medial arch or pars medialis, formed by the calcaneus, talus, and the navicular, cuneiform, and the first three tarsal bones; and the lateral arch or pars lateralis, formed by the calcaneus, the cuboid bone, and the lateral two metatarsal bones. The transverse arch comprises the navicular, cuneiform, cuboid, and five metatarsal bones.
lingual arch a wire appliance that conforms to the lingual aspect of the dental arch, used to secure movement of the teeth in orthodontic work.
mandibular arch
1. the first branchial arch, being the rudiment of the maxillary and mandibular regions; it also gives rise to the malleus and incus.
2. the dental arch formed by the teeth of the mandible; called also inferior dental arch.
maxillary arch the dental arch formed by the teeth of the maxilla; called also superior dental arch.
neural arch vertebral arch.
palatal arch the arch formed by the roof of the mouth from the teeth on one side to those on the other.
pharyngeal a's structures in the neck region of the human embryo that are analagous to the branchial arches in lower vertebrates; the four pairs of pharyngeal arches are mesenchymal and later cartilaginous structures that develop during the first two months of embryonic life and are separated by clefts (the pharyngeal grooves). As the fetus develops, the arches grow to form structures within the head and neck. Two of them grow together and enclose the cervical sinus, a cavity in the neck. Called also branchial arches.
pubic arch the arch formed by the conjoined rami of the ischium and pubis of the two sides of the body.
pulmonary a's the most caudal of the aortic arches; it becomes the pulmonary artery.
tendinous arch a linear thickening of fascia over some part of a muscle.
vertebral arch the dorsal bony arch of a vertebra, composed of the laminae and pedicles of a vertebra.
zygomatic arch the arch formed by the temporal process of the zygomatic bone and the zygomatic process of the temporal bone. See also anatomic Table of Bones in the Appendices.

zy·go·mat·ic arch

[TA]
the arch formed by the temporal process of the zygomatic bone that joins the zygomatic process of the temporal bone.
Synonym(s): arcus zygomaticus [TA], cheek bone (2) , malar arch, zygoma (2)

zygomatic arch

n.
The bony arch in vertebrates that extends along the side or front of the skull beneath the eye socket and that is formed by the zygomatic bone and the zygomatic process of the temporal bone.

zygomatic arch

Etymology: Gk, zygon + L, arcus, bow
an arch formed by the temporal process of the zygomatic bone with the zygomatic process of the temporal bone. The tendon of the temporal muscle passes beneath it.

zy·go·mat·ic arch

(zī'gō-mat'ik ahrch) [TA]
The arch formed by the temporal process of the zygomatic bone as it joins the zygomatic process of the temporal bones.
Synonym(s): zygoma (2) .

zygomatic arch

The bony arch extending below and to the outer side of the eye socket (the orbit) and forming the prominence of the cheek.

zy·go·mat·ic arch

(zī'gō-mat'ik ahrch) [TA]
Arch formed by temporal process of zygomatic bone that joins zygomatic process of temporal bone.
Synonym(s): arcus zygomaticus, cheek bone (2) , malar arch, zygoma (2) .

zygomatic arch,

n the arch formed by articulation of the temporal process of the zygomatic bone with the zygomatic process of the temporal bone. The colloquial term is
cheekbone.

arch

a structure of bowlike or curved outline.

arch of aorta
the curving portion between the ascending and descending aorta, giving rise to the brachiocephalic trunk and, in some species, the left common carotid and the left subclavian artery.
aortic a's
paired vessels that run from the ventral to the dorsal aortae through the branchial arches of fishes and amniote embryos. In mammalian development, arches 1 and 2 disappear; 3 joins the common to become the internal carotid artery; 4 becomes the arch of the aorta and joins the aorta and subclavian artery; 5 disappears; 6 forms the pulmonary arteries and, until birth, the ductus arteriosus.
arterial arch
one or more arteries that form an anastomotic connection between two more or less parallel tributaries; found commonly around joints and other moveable parts.
arch arteriosus, arcus arteriosus
a large communicating branch between two arteries.
branchial a's
four pairs of mesenchymal and later cartilaginous columns in the pharyngeal wall which in fish develop into gills and in mammals become modified into structures of the ear and neck.
branchial arch derivatives
derivatives of the arches are first arch (mandible, ossicles), second arch (hyoid apparatus, ear ossicles), third arch (hyoid apparatus), fourth arch (laryngeal cartilages).
costal arch
the rim to the bony thorax formed by the conjoined asternal ribs and their connecting elastic tissue.
cricoid arch
the slender ventral half of the cricoid cartilage of the larynx. The most caudal of the palpable landmarks of the larynx.
dental arch
the curving structure formed by the crowns of the teeth in their normal position, or by the residual ridge after loss of the teeth.
hemal arch
the v- or y-shaped bone borne on the ventral surface of the tail vertebrae of some animals and which protects blood vessels. Called also chevron bone.
hyoid arch
the second branchial arch.
ischial arch, ischiatic arch
the caudal rim of the pelvis formed by the conjunction of the two ischiae. Called also sciatic arch.
lumbocostal arch of the diaphragm
the dorsal part of the diaphragm where it crosses the ventral surface of the psoas muscles. Here it is without any attachment and only serous membranes separate the thoracic and peritoneal cavities.
mandibular arch
the first branchial arch, being the rudiment of the maxillary and mandibular regions.
neural arch
the dorsal vertebral arch.
palatal arch
the arch formed by the roof of the mouth from the teeth on one side to those on the other.
palatoglossal arch
the thick fold of tissue passing from the soft palate to the lateral border of the tongue.
palatopharyngeal arch
a horizontal fold of pharyngeal mucosa that passes from the soft palate and joins with its opposite fold over the entrance to the esophagus.
palmar arch
a superficial and a deep vascular arch behind the carpus formed by the conjunction of several arteries of the forearm.
pulmonary a's
the most caudal of the embryonic aortic arches, which become the pulmonary arteries.
sciatic arch
ischial arch.
subcarpal arch
the deep palmar arch, especially of horses.
superficial dorsal arch
one of the arterial arches in the foot of carnivores.
supracarpal arch
the superficial palmar arch, especially of horses.
tendinous arch
a linear arched thickening of fascia that provides attachment for some muscles.
terminal arch
the union between the medial and lateral palmar digital arteries, which in horses runs through the solar canal within the distal phalanx.
vertebral arch
the dorsal bony arch of a vertebra, composed of paired laminae and pedicles.
zygomatic arch
the arch formed by the processes of the zygomatic and temporal bones that is the principal origin of the masseter muscle and is particularly broad and prominent in carnivores.

zygomatic

pertaining to zygomatic bone.

zygomatic arch
the arch formed by the processes of the zygomatic and temporal bones.
zygomatic bone
the bone forming the hard part of the cheek and the lower, lateral portion of the rim of the orbit. See also Table 10.
zygomatic gland
a salivary gland, formerly known as the orbital or upper molar gland, best developed in carnivores; located above the zygomatic arch and below the eye. Enlargement or mucocele of the gland causes exophthalmos.
zygomatic mucocoele
accumulation of salivary secretions from the zygomatic gland. It appears as a protruding mass under the conjunctiva of the lower eyelid.
zygomatic process
a projection from the frontal or temporal bone, or from the maxilla, by which they articulate with the zygomatic bone.