Heath's practical anatomy : a manual of dissections / [Christopher Heath].

  • Heath, Christopher, 1835-1905.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Heath's practical anatomy : a manual of dissections / [Christopher Heath]. Source: Wellcome Collection.

    738/800 (page 716)
    In an eye from which the vitreous humour has been removed, the greyish unpigmentecl strata of the retina will shrink, leaving exposed the retinal pigment adherent to the inner surface of the choroid; and in the bullock's eye will be seen the tapetum lucidum^ that gives the coloured appearance peculiar to the lower animals. The tapetuni consists of a thick layer of wavy fibrous tissue outside the retinal pigment. [The retina is best seen by looking through the vitreous humour of an eye from which the iris and lens have been removed.] The Retina (Fig. 323, 9) lines the choroid coat, and is the nervous membrane of tlie eye. It is connected posteriorly with the optic nerve, and extends in front as far forward as the finely serrated circle corresponding to the posterior part of the ciliary processes {ora serrata), gradually losing in thickness as it leaves the nerve. Beyond this point it is continued over the ciliary processes in a modified form, but without any specific nervous elements. Fig. 328. Fig. 328.—Optic disc (after Jaeger). A. Optic disc. li. Venous radicles uniting to form a n. Inner side. [trunk. t. Outer side. g. Arteria centralis retinae dividing ^, h. Choroidal ring. €^ c. Retinal arteries. d. Eetinal veins. L. Physiological cup and lamina eribrosa.