Morphological Studies on the Choroid Plexus in Balady Goat (Capra hircus)

Document Type : Original Article

Authors

1 Department of Anatomy and embryology, Faculty of Vet. Med., Mansoura University, Egypt.

2 Department of Anatomy and embryology, Faculty of Vet. Med., Zagazig University, Egypt.

3 Department of Cytology and Histology, Faculty of Vet. Med., Minufiya University Sadat city branch, Egypt.

Abstract

The lateral ventricle choroid plexus could be subdivided according to its vascular pattern into caudal part, middle part and rostral part (villus fringes), The two narrow bands which arose from the choroid plexuses of the lateral ventricles passed in the interventricular foramen, forming the choroid plexus of the third ventricle, each band appeared under stereomicroscope as down folding liner tufts reaching the level of pineal body. The third and fourth ventricles choroid plexuses consisted of a large number of leaves- like processes connected to a more basal core of the stromal tissue by a stem. Secondary leaf-like elevations might arise from primary leaves. The stromal tissue extended into the leaves accompanied by vessels which brake up into capillary plexuses in the body of the leaves. The highly vascular stroma of the choroid plexus covered with a single layer of cuboidal epithelium almost ciliated, with an average height 9.55 μm. The covering epithelium constitutes about 19.5 %, 31.9 % and 31.8% of the total bulk of the choroid plexuses of the lateral, third and fourth ventricles respectively. Rela- tively large amount of connective tissue separated the blood vessels from the epithelium representing about 30.1% of the total bulk of the lateral ventricle choroid plexus. While it represented about 28.7%, and 39.8 % in third and fourth ven- tricles choroid plexuses respective- ly, its main component was formed of collagen bundles. The connective tissue stroma sometimes appeared very thin that allowed apposing of the endothelium of the blood vessels with the basement membrane of the choroidal cells. The connective tissue stroma characterized by abundance of blood vessels. These blood vessels in the lateral ventricle were wide long, slightly tortuous and relatively parallel. The choroid plexus of the lateral ventricle was relatively highly vascular, the blood vessels represented about 49.8% of the total bulk of the lateral ventricle choroid plexus in comparison with the third ventricle choroid plexus (about 36.3%) and fourth ventricle choroid plexus (about 28.3%).

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