The commoner diseases of the eye : how to detect and how to treat them . vasal temporal The Optic Nerve Entrance, Showing the Appearancesby the Ophthalmoscope, and a Sectional View (Fuchs). is retained and may be seen in the ocular fundus as a dazzling white sheaf of opaque nerve fibres. The orbital part of the nerve is S-shaped to admit a free movement of the eyeball. It is 362 COMMONER DISEASES OF THE EYE made up of nerve bundles separated by connec-tive tissues and lymph spaces. Its envelopes arederived from the arachnoid, the pia mater andthe dura mater. Between the last is the inter-vagin
The commoner diseases of the eye : how to detect and how to treat them . vasal temporal The Optic Nerve Entrance, Showing the Appearancesby the Ophthalmoscope, and a Sectional View (Fuchs). is retained and may be seen in the ocular fundus as a dazzling white sheaf of opaque nerve fibres. The orbital part of the nerve is S-shaped to admit a free movement of the eyeball. It is 362 COMMONER DISEASES OF THE EYE made up of nerve bundles separated by connec-tive tissues and lymph spaces. Its envelopes arederived from the arachnoid, the pia mater andthe dura mater. Between the last is the inter-vaginal lymph space, lined with endothelium and. Normal Background of the Eye as Seen by theOphthalmoscope. communicating with the arachnoid and ventricu-lar spaces in the brain. An optic nerve from each eyeball joins its fel-low at the chiasma, situated at the optic groovein the sphenoid bone. One-half of the fibres of DISEASES OF THE OPTIC NERVE each nerve pass over, join the opposite, nerveand proceed towards the occipital lobe as anoptic tract. These wind around the crura cere-bri, making connections with practically everycentral neuron and with one another, until theyreach and form the parts surrounding the cal-carine fissure of the occipital lobe, which is knownas the cortical center of cerebral vision. Thuseach retina is connected by nerve fibres with thegreat centers of both sides of the brain. The temporal or outer half of the right retinaand the nasal half of the left are supplied byright sided fibres; the nasal half of the rightretina and the temporal half of the left retina areinnervated from the left side of the brain.
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