Knowra Pharyngeal slit Pharyngeal slit A groove or opening in the pharynx that connects it to the outside or to the pharyngeal cavity. Pharyngeal slits occur in chordates during at least one life stage and have different functions across lineages.
Pharyngeal pouch : An inward fold of the embryonic pharyngeal lining that can meet an external groove to form a slit. Pouches form on the inside of the pharynx and help produce slits in many vertebrate embryos.
Pharynx : A chamber behind the mouth that conducts food or water and, in some animals, participates in respiration. A pharyngeal slit is defined by its position in this chamber.
Lancelet : A small marine invertebrate chordate with a notochord and many pharyngeal slits used in filter feeding. Its adult pharynx retains numerous functional slits.
Pharyngeal cleft : An external embryonic groove between adjacent pharyngeal arches. A cleft is a surface groove, whereas a slit is an opening through the pharyngeal wall.
Pharyngeal arch : A segmented embryonic structure between adjacent pharyngeal pouches, containing mesoderm, neural crest, and associated vessels and nerves. Arches lie between slits and contribute to the structures surrounding them.
Chordate : An animal belonging to the phylum Chordata, whose members possess a notochord, dorsal nerve cord, and pharyngeal slits at some stage. Pharyngeal slits are one of the characteristic features of chordates.
Tunicate : A marine chordate whose adult body is often sac-like and whose pharynx commonly filters food from water. The adult tunicate uses a perforated pharynx for water flow and feeding.
Pharyngeal membrane : A thin embryonic partition formed where an internal pharyngeal pouch approaches an external cleft. A membrane can separate pouch and cleft before an opening forms.
Ciliary feeding : A feeding method in which cilia move water or food particles through an animal’s body. Cilia can drive water through pharyngeal slits, bringing food particles toward the digestive tract.
Notochord : A flexible, rod-like supporting structure present in chordates during at least one developmental stage. It is another defining chordate feature, distinct from the pharyngeal slits.
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