pharyngeal arch

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Related to pharyngeal arch: pharyngeal pouch, second pharyngeal arch

pharyngeal arch

The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

pha·ryn·ge·al arch

(făr-in'jē-ăl ahrch)
Typically, there are six arches in embryos of vertebrates; in the lower vertebrates, they bear gills; in the higher vertebrates (e.g., human embryos), they appear transiently and give rise to specialized structures in the head and neck.
Synonym(s): branchial arch.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(arch) [L. arcus, a bow]
An anatomical structure having a curved or bowlike outline. See: arcus

abdominothoracic arch

The anterior and lateral boundary between the line dividing the thorax and the abdomen.
Synonym: costal arch

alveolar arch

The arch of the alveolar process of either jaw (maxillary and mandibular arch).

aortic arch

Any of a series of six pairs of vessels that develop in the embryo and connect the aortic sac with the dorsal aorta. During the fifth to seventh weeks of gestation, the arches undergo transformation, some persisting as functional vessels, others persisting as rudimentary structures, and some disappearing entirely.

axillary arch

An anomalous muscular slip across the axilla, between the pectoralis major and latissimus dorsi muscles.

branchial arch

Any of five pairs of arched structures that form the lateral and ventral walls of the pharynx of the embryo. The first is the mandibular arch; the second is the hyoid arch; the third, fourth, and fifth arches are transitory. They are partially separated from each other externally by the branchial clefts and internally by the pharyngeal pouches. They are important in the formation of structures of the face and neck.
Synonym: pharyngeal arch

carotid arch

The third aortic arch, which provides the common carotid artery.

costal arch

Abdominothoracic arch.

crural arch

The inguinal ligament, which extends from the anterior superior iliac spine to the pubic tubercle. Synonym: Poupart's ligament

deep crural arch

A band of fibers arching in front of the sheath of femoral vessels; the downward extension of the transversalis fascia.

deep palmar arch

An arch formed in the palm by the communicating branch of the ulnar and the radial artery.

dental arch

The arch formed by the alveolar process and teeth in each jaw (maxillary and mandibular arch). Synonym: arcus dentalis

arch of foot

Any of the four vaulted structures in the foot: the internal (medial) longitudinal, the outer (lateral) longitudinal, and two transverse.

glossopalatine arch

The anterior pillar of the fauces; one of two folds of mucous membrane extending from the soft palate to the sides of the tongue.

hemal arch

1. In lower vertebrates, extensions from the lateral areas of the caudal vertebrae that fuse to enclose the caudal artery and vein. In humans these are represented by the costal processes of the vertebrae.
2. An arch formed by the body and dorsal processes of a vertebra.

hyoid arch

The second branchial arch, which gives rise to the styloid process, the stylohyoid ligament, and the lesser cornu of the hyoid bone.

inferior tarsal arch

The arch of the median palpebral artery that supplies the lower eyelid.

longitudinal arch

The anteroposterior arch of the foot; the medial portion is formed by the calcaneus, talus, navicular, the three cuneiform bones, and the first three metatarsals; the lateral portion is formed by the calcaneus, cuboid, and the fourth and fifth metatarsals.

mandibular arch

1. The curved composite structure of natural dentition and supporting tissues of the mandible.
2. The residual bony ridge after teeth have been lost from the mandible.

maxillary arch

The curved composite structure of the natural dentition and supporting tissues of the upper jaw (maxillary and mandibular arch); the residual bony ridge after teeth have been lost from the upper jaw.

nasal arch

An arch formed by the nasal bones and by the nasal processes of the maxilla.

neural arch

Vertebral arch.

palatopharyngeal arch

Pharyngopalatine arch.

palmar arch

See: deep palmar arch; superficial palmar arch

pharyngeal arch

Branchial arch.

pharyngopalatine arch

The posterior pillar of the fauces; one of two folds of mucous membrane extending from the soft palate to the sides of the pharynx. The palatine tonsil lies in the front of the pharyngopalatine and behind the palatoglossal arch. Synonym: palatopharyngeal arch

plantar arch

The arch formed by the external plantar artery and the deep branch of the dorsalis pedis artery.

pubic arch

The arch formed by the rami of the ischia and pubic bones. It forms the anterior portion of the pelvic outlet.

pulmonary arch

The fifth aortic arch on the left side. It becomes the pulmonary artery.

superciliary arch

A curved process of the frontal bone lying just above the orbit, subjacent to the eyebrow, and directly above the supraorbital notch.
Synonym: superciliary ridge

superficial palmar arch

An arch in the palm forming the termination of the ulnar artery.

superior tarsal arch

The arch of the median palpebral artery that supplies the upper eyelid.

supraorbital arch

A bony arch formed by the upper margin of the orbit.

tarsal arch

See: inferior tarsal arch; superior tarsal arch

thyrohyoid arch

The third branchial arch, which gives rise to the greater cornu of the hyoid bone.

transverse arch

The transverse arch of the foot formed by the navicular, cuboid, cuneiform, and metatarsal bones.

vertebral arch

The arch formed by the posterior projection of a vertebra that, with the body, encloses the vertebral foramen. Synonym: neural arch

zygomatic arch

The formation, on each side of the cheeks, of the zygomatic process of each malar bone articulating with the zygomatic process of the temporal bone.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
The branchial apparatus of all vertebrates is composed of 6 pharyngeal arches, but only 4 are well developed in mammals and birds.
All turned on genes in the developing ear and eye, and in the embryonic gills, or pharyngeal arches.
The pharyngeal roof and any neural tissue attached to the pharyngeal arches that might obscure the view of the primordium were also removed.
Contribution from the paired fourth pharyngeal arches to the lateral portion of the epiglottis remains controversial.
The first is the branchial origin; FT is considered to be an incomplete union of the cartilaginous elements of the fourth and sixth pharyngeal arches from which the thyroid lamina is derived.
Development of the face, oral cavity, and pharyngeal arches. In: Johnson KE.
(13) (It is interesting that velocardiofacial syndrome sequence deletions appear to be similar to those noted in DiGeorge syndrome, which is linked to malformations of the fourth and fifth pharyngeal arches. In both syndromes, conotruncal cardiac anomalies are often noted.