Gill Slit (Pharyngeal Cleft, Branchial Cleft, Visceral Cleft)

Gill cleft (Pharyngeal Cleft, Branchial Cleft, Visceral Cleft) is one of the stages of embryonic development in vertebrates. It is a paired cleft, divided into separate segments, located on both sides of the anterior end of the dorsal chord of the embryo at an early stage of its development. Each slit corresponds to a fish's gills and has its own unique structure and function.

During embryonic development, when the gill slits are fully formed, they close, forming pharyngeal pouches. Only the first gap remains unclosed, which turns into the external auditory canal. Under normal conditions, the gill slits should close before the baby is born.

However, in rare cases, the gill slits may remain open after birth, which can lead to the development of various diseases. For example, inflammation of the gill slits can lead to the formation of cysts, which can be located on the neck or deep in the tissues. In such cases, surgery may be required.

In addition, open gill slits can be one of the signs of a number of genetic diseases, for example, Diamond-Blackfan syndrome. This syndrome is characterized by the presence of several open gill slits, which can lead to breathing and digestive problems.

In conclusion, the cleft of the gill is an important stage of embryonic development and is of great importance for understanding the anatomy and functioning of the human body. Although open gill slits are rare, they can lead to serious health problems and require specialized treatment.

Gill cleft or visceral cleft is a type of intrauterine congenital malformation of the human fetus. Cleft gill slits are very rare - the frequency of the syndrome is about 1 case per 40 - 60 thousand births.

The slit of the gill arch is present in all aquatic species (fish, amphibians, reptiles) and is their species-specific feature. In primates, the presence of gill arches is not a mandatory feature of the mammalian class. Moreover, this anomaly is not typical even for people, who are often classified as mammals.

Experts classify the slit of the gill process, which is divided into individual segments, according to the following points:

1. absence or underdevelopment of the last pair of gill cavities; 2. preservation of the first pair of processes, which are a rudiment characteristic of most fish

The gill slit is a paired slit, divided into segments, located early in embryonic development. It corresponds to the gills of the fish and is located on either side of the front of the dorsal string. When the fissures are fully formed, they close and form the pharyngeal pouches, and the first fissure remains unclosed and becomes the external auditory canal.