. The anatomy of the human body. Human anatomy; Anatomy. THE VITREOUS BODY. 661 Fig. optic nerve, is surrounded with a zone of a canary-yellow colour: this is the limbus lu- Uus foraminis centralis (Scemmermg), or the yellow spot of Scem- mcring (a). The foramen centrale and the limbus luteus exist in man and th p quadrumana only ; that is to say, in those cases only in which tli visual axes of the two eyes are parallel to each other, as in mai I have not found that the yellow spot corresponds to the thicl est part of the retina It should, moreover, be observed, that the foramen centrale
. The anatomy of the human body. Human anatomy; Anatomy. THE VITREOUS BODY. 661 Fig. optic nerve, is surrounded with a zone of a canary-yellow colour: this is the limbus lu- Uus foraminis centralis (Scemmermg), or the yellow spot of Scem- mcring (a). The foramen centrale and the limbus luteus exist in man and th p quadrumana only ; that is to say, in those cases only in which tli visual axes of the two eyes are parallel to each other, as in mai I have not found that the yellow spot corresponds to the thicl est part of the retina It should, moreover, be observed, that the foramen centrale, not the entrance of the optic nerve, corresponds to the antero-posterior axis of the globe of the eye, and is the true centre of the retina. The uses of the central foramen and the yellow spot are not known. The j'ellow spot does not exist in the foetus.* The Humours of the Eye. The media through which the light passes in the eye, besides the transparent cornea already described, are the vitreous body, the crystalline lens, and the aqueous humour. The Vitreous or Hyaloid. Body. The vitreous or hyaloid body {v, figs. 247, 248) (from va'ko^, glass), so called from its re- semblance to glass, is an imperfectly spheroidal, and quite transparent mass, which oc- cupies the posterior three fourths {v,Jig. 241) of the globe of the eye; it is covered im- mediately by the retina {v, fig. 245), which is simply in contact with it, and indirectly by the other coats of the back part of the eye, which are accurately moulded upon it. It pre- sents a slight depression in front, for the reception of the posterior surface of the crys- talline lens (l). The vitreous body and the crystalline lens together very nearly resem- ble in form the entire globe of the eye, the projection of the crystalline lens representing the prominence of the cornea (compare figs. 241 and 245). The vitreous body is composed of a liquid, named the vitreous humour,i and of the hy- aloid membrane. The hyaloid membrane {h,
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