Pharyngeal slits

Definition

Pharyngeal slits are openings found in the pharynx of all chordates at some stage of their development. These structures function primarily in filter-feeding and respiration in various organisms.

5 Must Know Facts For Your Next Test

1. Pharyngeal slits are present in all chordate embryos, even if not retained in adult forms.
2. In aquatic vertebrates like fish, pharyngeal slits develop into gills used for breathing.
3. In terrestrial vertebrates, pharyngeal slits contribute to the formation of structures such as the ear and tonsils.
4. They are one of the four defining characteristics of chordates, along with a notochord, a dorsal hollow nerve cord, and a post-anal tail.
5. Pharyngeal slits play a role in both feeding and respiratory functions in different groups of chordates.

Review Questions

Related terms

Notochord: A flexible rod made out of a material similar to cartilage that provides support for the embryo.

Dorsal Hollow Nerve Cord: A tube-like structure located dorsally to the notochord that develops into the central nervous system.

Post-Anal Tail: An extension of the body past the anus present during some stage of development in all chordates.