The embryology anatomy and histology of the eye / by Earl J. Brown. The physiology of vision / by Wm. D. Zoethout.

  • Brown, Earl J.
Date:
1906
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Licence: In copyright

Credit: The embryology anatomy and histology of the eye / by Earl J. Brown. The physiology of vision / by Wm. D. Zoethout. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    fifth cranial nerve, and at E the gasserian ganglion. At F is shown the first division, which is known as the ophthalmic nerve, and at L is shown its branches to the lenticular ganglion. At G is shown the second division or superior maxillary nerve, but in the study of the eye we are only interested in two of its branches; first the one shown at M, known as the orbital nerve, which goes to the lower outer side of the eyeball, forming an anastomosis with the lachry- mal nerve, T, and the terminal branch runs forward and passes out onto the face through the infra orbital forameK (See D, Fig. 31) and supplies the sensation to the lower lid and region just below the eye. This branch is known as the infra orbital nerve. The lenticular ganglion, K, is of vast importance to the eyeball. It is a small pinkish body about the size of a pin- head and is situated some seven to ten millimeters back of the eyeball. On the outer side of the optic nerve, between it and the ophthalmic artery, it receives filaments, or roots, J, from the motor oculi nerve, which are motor from the nasal nerve, L. as well as from the ophthalmic nerves which are sensory. It also receives filaments or roots from the sympathetic nervous system, which comes from the carotid ' plexus. Thus it is seen, there are motor, sensory and sym- pathetic filaments received by it. Then from this ganglion is given of? the posterior ciliary nerves, N. These are mixed nerves and carry motor, sensory and sympathetic fibers. These nerves, from twelve to twenty in number, enter the eyeball posteriorly with the posterior ciliary arteries (See A, Fig. 39, and A, Fig. 44). These pierce the sclerotic just outside of the optic nerve in a circle and pass forward most- ly in the supra choroidal space, and if we should enucleate an eyeball and dissect away the sclerotic and all other struc- tures except ihc nerves, we would have a picture as shown in Fig. 44. The posterior ciliary nerves, P>, run forward in the supra clioioidal space and give numerous I)ranchcs to the choroid, C, in their course. They theii break up into small