What is arch?

Arch is any of several curved structures of the body.
aortic a.’s of the embryo A series of six arterial channels encircling the embryonic
pharynx in the mesenchyme of the pharyngeal arches; they are never present all at the same time.
a. of the aorta The curved portion of the aorta between the ascending and descending
parts of the thoracic aorta.
costal a. An arch formed by the borders of the inferior aperture of the thorax, comprised of the costal cartilages of ribs seven to ten.
a.’s of foot The two sets of arches formed by the bones of the foot.
longitudinal a. The anteroposterior arch of the foot, formed by the seven tarsal and five metatarsal bones and the ligaments binding them together.
palatoglossal a. One of two folds of mucous membrane extending from the posterior
edge of the soft palate to the side of the tongue; forms the anterior margin of the tonsillar fossa.
palatopharyngeal a. One of two folds of mucous membrane passing downward from the posterior edge of the soft palate to the lateral wall of the pharynx; forms the posterior margin of the tonsillar fossa.
pharyngeal a. One of a series of five mesodermal arches in the neck region of the embryo from which several structures of the head and neck develop.
pubic a. Arch on the pelvis formed by the convergence of the inferior rami of the ischium and pubic bones on either side.
superciliary a. An arched prominence above the upper margin of the orbit.
transverse a. The arch of the foot formed by the proximal parts of the metatarsal bones anteriorly and the distal row of the tarsal bones posteriorly.
vertebral a. The arch on the dorsal side of a vertebra which, with the vertebral body, forms the foramen in which the spinal cord is lodged.
zygomatic a. The arch formed by the zygomatic process of the temporal bone and the temporal process of the zygomatic bone.

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