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MIDWIFERY

1870 American Journal of the Medical Sciences  
Midwifery. 565 1870.] described the lymphatic spaces of the posterior division of the eyeball, which include the perivascular spaces of the retina, the perichoroid space with its efferent channels, and. finally, a lymphatic space between the outer and inner sheaths of the optic nerve, which, without communicating with the other two, opens directly into the arachnoid sac of the brain. Between the inner surface of the sclerotica and the outer layer of the choroid is a space which was recognized
more » ... ch was recognized by Arnold as a serous cavity, and to which the name " aruchnoidea oculi" might be given. It is distinct from the lamina fusca. though in part occupied by connective tissue, clastic fibres, and stellate pigment cells. The opposed surfuces are smooth and shining, and, after treatment with nitrate of silver, exhibit epithelial murkings with oval nuclei. It is most distinct in white rab¬ bits, but cannot be demonstrated in the eye of man, on account of the difficulty of obtaining fresh human eyes. When filled with a coloured fluid by injection, the space was found to reach backward to the neighbourhood of the entrance of the optic nerve, and forward as far as just under the ciliary processes. The injection left the ball at four points corresponding to the entrance of the vena; vorticossc, and cross sections showed that the veins were encircled by the injection. On escaping from the globe, the injection filled the capsule of Tenon, which again was found to communicate backwards, by a cylindrical channel surrounding the outer fascia of the optic nerve, with the arachnoid space of the skull. Besides the canal just spoken of as surrounding the whole optic nerve, to which the author gives the name " supravaginal" space, there is another included between the two fascia; of this nerve, which he calls the " subvaginnl." This is continuous with the arachnoid, but does not communi¬ cate with the proper lymphutic spaces of the eye.-Lancet, May 7th, 1870. MIDWIFERY.
doi:10.1097/00000441-187010000-00045 fatcat:2nely6eixnhshdtxqv2z2nxozm