Peripaleocortex is one of two subtypes of
periallocortex,
the other being
periarchicortex.
Peripaleocortex is formed at borders between
isocortex (neocortex) and
paleocortex
In anatomy of animals, the paleocortex, or paleopallium, is a region within the telencephalon in the vertebrate brain. This type of cerebral cortex, cortical tissue consists of three cortical laminae (layers of perikaryon, neuronal cell bodies). I ...
(a subtype of
allocortex
The allocortex (from Latin allo-, meaning other, and cortex, meaning bark or crust), or heterogenetic cortex, is one of the two types of cerebral cortex in the brain, together with the neocortex. In the human brain, the allocortex is the much sm ...
). It shows slow
histological
Histology,
also known as microscopic anatomy or microanatomy, is the branch of biology that studies the microscopic anatomy of biological tissue (biology), tissues. Histology is the microscopic counterpart to gross anatomy, which looks at large ...
transition from the three-layered structure characteristic of paleocortex to the typical six-layered structure characteristic of isocortex.
The main peripaleocortex area is anterior
insular cortex
The insular cortex (also insula and insular lobe) is a portion of the cerebral cortex folded deep within the lateral sulcus (the fissure separating the temporal lobe from the parietal lobe, parietal and frontal lobes) within each brain hemisphere ...
.
Peripaleocortex does not histologically transit directly to the true isocortex. Instead, at borders between peripaleocortex and isocortex, there are other transitional areas from the isocortex side, called
proisocortex
Proisocortex or pro-isocortex is one of two subtypes of cortical areas in the areas belonging to the neocortex. The other subtype is termed the true isocortex. Proisocortical areas are transitional areas placed between areas of true isocortex and ...
.
Thus, at borders between paleocortex and isocortex, there are two transitional areas. One transitional area, which is anatomically located closer to the paleocortex side and histologically, too, more resembling "true" paleocortex, is called peripaleocortex area.
Another transitional area, which is anatomically located close to the true isocortex side and histologically more resembling it too, is called proisocortex area.
References
{{neuroanatomy-stub
Cerebral cortex