Are Pharyngeal Slits Gills?

Note: Pharyngeal slit is a third chordate feature. They have been modified to a large extent in the course of evolution. In primitive chordates, these slits are used to filter food particles from the water but now the slits bear gills and are used for gas exchange, in fishes and some amphibians.

Do humans have pharyngeal gill slits?

Pharyngeal slits are openings in the pharynx that develop into gill arches in bony fish and into the jaw and inner ear in terrestrial animals. The post-anal tail is a skeletal extension of the posterior end of the body, being absent in humans and apes, although present during embryonic development.

Are pharyngeal pouches gills?

In the embryonic development of vertebrates, pharyngeal pouches form on the endodermal side between the pharyngeal arches. The pharyngeal grooves (or clefts) form the lateral ectodermal surface of the neck region to separate the arches. The pouches line up with the clefts, and these thin segments become gills in fish.