Template:Head terms

Head Terms (expand to view)

acephaly - term meaning absence of head, see skull and head abnormalities. branchial arch - see pharyngeal arch. brachycephaly - term meaning premature fusion of coronal suture, see skull and head abnormalities. clefting - the way in which the upper jaw forms from fusion of the smaller upper prominence of the first pharyngeal arch leads to a common congenital defect in this region called "clefting", which may involve either the upper lip, the palate or both structures, see pharyngeal arch and head abnormalities. cysts - refers to a cervical sinus abnormality, remants of the cervical sinus remains as a fluid-filled cyst lined by an epithelium, see pharyngeal arch and head abnormalities. exencephaly - term meaning brain outside skull, see skull and head abnormalities. fistula - refers to a pharyngeal membrane abnormality, a tract extends from pharynx (tonsillar fossa) beween the carotid arteries (internal and external) to open on side of neck, see pharyngeal arch and head abnormalities. macrocephaly - term meaning large head, see hydrocephalus, skull and head abnormalities. Meckel's cartilage - (pharyngeal arch 1 cartilage) The mandible forms by intramembranous ossification beside this transient cartilage. The middle ear malleus and incus are thought to form from the ends of this cartilage. micrencephaly - term meaning small brain, see neural, skull and head abnormalities. otocephaly - term meaning absence of lower jaw, see skull and head abnormalities. oxycephaly - (turricephaly) term meaning premature fusion of coronal suture + others, see skull and head abnormalities. pharyngeal arch - (branchial arch) a structure that forms in the cranial region of the embryo having contributions from all germ layers. In humans, the arches appear in week 4 (GA week 6) in a rostra-caudal sequence and are numbered (1, 2, 3, 4, and 6). Each arch contributes a different part of the head and neck and the associated components. pharyngeal cleft - (groove) surface ectoderm that externally separates each pharyngeal arch. In humans, only first pair persist as the outer ear external auditory meatus. pharyngeal groove - see pharyngeal cleft. pharyngeal membrane - surface ectoderm and pharynx endoderm contact region lying between each pharyngeal arch. In humans, only the first membrane pair persist as the tympanic membrane. pharyngeal pouch - pharynx endoderm internal out-pocketing that separates each pharyngeal arch. plagiocephaly - term meaning premature unilateral fusion of coronal or lambdoid sutures, see skull and head abnormalities. Reichardt's cartilage - (pharyngeal arch 2 cartilage) The superior portion of the hyoid forms the ventral portion of this cartilage and the middle ear stapes is thought to form from the ends of this cartilage. scaphocephaly - (dolichocephaly) term meaning premature fusion of sagittal suture, see skull and head abnormalities. sinuses - refers to a pharyngeal groove (cleft) abnormality, when a portion of the groove persists and opens to the skin surface, located laterally on the neck, see pharyngeal arch and head abnormalities. trigonocephaly - term meaning premature fusion of metopic suture, see skull and head abnormalities. vestiges - refers to a cartilaginous or bony developmental remnants that lie under the skin on side of neck, see pharyngeal arch and head abnormalities.