The upper diagram represents a stage before the formation of the choroidal slit, the lower one the stage of closure of the choroidal slit.
Blood may also be effused into the vitreous from rupture of retinal, ciliary or choroidal vessels.
Up to the seventh month the pupil is closed by the membrana pupillaris, derived from the capsule of the lens which is part of the mesodermal ingrowth through the choroidal fissure already mentioned.
Choroidal inflammations are generally patchy, various foci of inflammation being scattered over the choroid.
The choroid plexuses contain the small choroidal arteries; and the blood from these is returned by small veins, which join to form the veins of Galen.
Some of them, like the choroidal on the mesial surface, are developed very early, while the vesicle is little more than epithelial, and contain between their walls an inpushing of mesoderm to form the choroid plexus.
The Graefe’s knife is driven through the conjunctiva and sclerotic, the incision being made antero-posteriorly in the direction of the fibres of the sclerotic to avoid wounding the choroidal vessels.
Through this gap, which afterwards receives the name of the choroidal fissure, a way is open from the mesoblastic tissue surrounding the optic vesicle and stalk into the interior of the cavity of the cup.
The choroidal fissure, though formed entirely underneath the superficial epiblast, is distinctly visible from the outside.
Section along the line zz, perpendicular to the plane of the paper, to shew the choroidal fissure f, and the continuity of the cavity of the optic stalk with that of the primary optic vesicle.
It is reconverted into visual purple by the regenerating action of the choroidal epithelium.
Defn: Having the power to produce a purple color; as, the purpurogenous membrane, orchoroidal epithelium, of the eye.
She suffered, we afterwards concluded, from choroidal tuberculosis.
A patient, then aged 21, suffered three years ago from a scotoma almost central; and was first seen six months after that with a macular choroidal atrophy and abnormal pigmentation.
The spongy nature of this meshwork affords free access of aqueous to the venous sinus of Schlemm, thence by tributaries into the supra-choroidal space and anterior uveal venous system.
Whether the action of the eserin on the choroidal circulation, which is maintained by Wahlfours, aids in this favorable action of the myotics remains to be proved.
There was extensive damage to both eyes, hæmorrhage, and probably retinal detachment as well as choroidal changes.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "choroidal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
