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This media file is a scanned image of a page from a biology textbook. The page contains diagrams and text related to the anatomy and physiology of the human eye, specifically focusing on the optic nerves, optic tract, optic chiasma, and the blood supply to the eye. The primary subjects are anatomical diagrams of the eye and its nervous pathways, and text explaining these structures. There are no people depicted in the image. The objects are scientific illustrations and printed text. The scene is a sterile, educational context, likely a textbook illustration. The activity taking place is the presentation of scientific information. There is no event or action occurring in the image itself. Notable details include the detailed diagrams illustrating the path of optic nerves from the retina to the brain, including the optic chiasma where nerve fibers cross over. Labels on the diagrams include "Optic nerve," "Optic chiasma," "Optic tract," "Optic radiations," "Lateral geniculate body," "Visual area in occipital lobe of cerebrum," "Macula lutea," "Medial retinae," and "Lateral retina." The text explains the functions of these parts and the blood supply to the eye. There are no location cues, time of day, weather, or emotions visible or implied. Visible text includes: - "Figure 13:13 The retina as seen through the pupil." - "Blood supply to the eye" - "The optic chiasma" - "Macula lutea" - "Vein" - "Artery" - "Optic disc" - "THE SPECIAL SENSES 205" - "The eye is supplied with arterial blood by the ciliary arteries and the central arteries of the retina. These are branches of the ophthalmic artery which is one of the branches of the internal carotid artery. Venous drainage is by a number of veins which eventually empty into the cavernous sinus." - "INTERIOR OF THE EYEBALL" - "The anterior segment of the eye, that is, the space between the cornea and the lens, is incompletely divided into anterior and posterior chambers by the iris. Both chambers contain a clear, watery fluid known as the aqueous fluid (humour). This fluid filters into the posterior chamber from capillaries in the ciliary body and is drained back into the circulation through the tiny ducts at the angle of the sclera and ciliary body." - "Behind the lens and filling the cavity of the eyeball is the vitreous body (humour). This is a soft, colourless, transparent, jelly-like substance composed of 99 per cent water, some salts
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