Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia.
Related to palatal arch: uvula
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.
four pairs of arched columns in the neck region of some aquatic vertebrates that bear the gills.
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.
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.
palatal archThe bony arch at the roof of the mouth, which is comprised of the inferior faces of the maxillary and palatine bones.
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.
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.
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.
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).
the rim to the bony thorax formed by the conjoined asternal ribs and their connecting elastic tissue.
the slender ventral half of the cricoid cartilage of the larynx. The most caudal of the palpable landmarks of the larynx.
the curving structure formed by the crowns of the teeth in their normal position, or by the residual ridge after loss of the teeth.
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.
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.
the first branchial arch, being the rudiment of the maxillary and mandibular regions.
the dorsal vertebral arch.
the arch formed by the roof of the mouth from the teeth on one side to those on the other.
the thick fold of tissue passing from the soft palate to the lateral border of the tongue.
a horizontal fold of pharyngeal mucosa that passes from the soft palate and joins with its opposite fold over the entrance to the esophagus.
a superficial and a deep vascular arch behind the carpus formed by the conjunction of several arteries of the forearm.
the most caudal of the embryonic aortic arches, which become the pulmonary arteries.
the deep palmar arch, especially of horses.
superficial dorsal arch
one of the arterial arches in the foot of carnivores.
the superficial palmar arch, especially of horses.
a linear arched thickening of fascia that provides attachment for some muscles.
the union between the medial and lateral palmar digital arteries, which in horses runs through the solar canal within the distal phalanx.
the dorsal bony arch of a vertebra, composed of paired laminae and pedicles.
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.