Choroidea

Choroidea [Chorioidea]

Definition

Felipe Barona Lopez

The choroid is the posterior part of the vascular layer of the eyeball, located between the sclera and the optic part of the retina. It is the most vascularized tissue in the entire body. The choroid is formed by a compact network of vessels organized in two layers.

  • The vascular lamina is the outermost layer, containing medium-caliber vessels.

  • The capillary lamina is the most internal, and is a mono stratified network of fenestrated capillaries.

Between these two layers, carnivores, ruminants and equines have a reflective layer called Tapetum Lucidum. Blood vessels regularly cross this reflective layer to connect the two vascular layers.

References

Barone R, Simoens P. Anatomie comparée des mammifères domestiques, Tome 7, Neurologie II, Vigot, Paris, 2010.

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