Acrania

**Acrania.**

Translated from Greek, “akrania” means “akephalos,” which translates as “headless.” The word "akephaly" comes from the Greek words “ake” - “up”, “akos” - “down”. Thus, the term describes animals whose skulls would be reversed, meaning the entire brain would be turned backwards. Occurs to some extent in various types of birds and reptiles.

**Examples:** chicken, rooster, parrot, ostrich, cockerel, emu, coot, gannet, stork, crane, tinamu; the giraffe also has a little visible acrania, like mammals; different types of turtles: trionics and traverts have acrania in the form of a large convex part with a hump, these areas are equipped with blood vessels, their activity improves blood circulation in turtles; Kalimantan monitor lizards also have small acrania. It differs from other species of acrania because their skulls are flat and covered with bony shields that form a kind of shell that protects the brain when the animal is above the ground and serves as a support while the animal is lying or sitting. The skulls of this species are soft, which is a common feature for acrania. Only the upper part of the zygomatic bone is hard and participates in the formation of bone sutures. In some species of caimans, a spine is found in the acran region, and in the acanthouralia, flexible ribs run from the side, increasing strength. The bones of the Gersadia and the gecko are much narrower and smaller in size than those of the caiman. The sting of a rattlesnake does not have a clear localization, but is elongated and dispersed in the thickness of the soft tissues in a certain area of ​​the body. Acrania has no clear localization.

Akranite can occupy up to two-thirds of the head or even the entire head. Other cephalic extensions include the rostrum and proboscis