Elementary anatomy and physiology Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 AND PHYSIOLOGY. 375 hardened and partially divided into segments by an immersion in alcohol. 687. V i t r eons,—The Vitreous Humor (from its resem- blance to glass) is of the form of a sphere, with the anterior portion removed, and constitutes seven eighths of the globe of the eye. It is a transparent fluid enclosed in a transparent membrane, and through its central portion from the entrance of the optic nerve, there passes a small artery to the le
Elementary anatomy and physiology Elementary anatomy and physiology : for colleges, academies, and other schools elementaryanato00hitc Year: 1869 AND PHYSIOLOGY. 375 hardened and partially divided into segments by an immersion in alcohol. 687. V i t r eons,—The Vitreous Humor (from its resem- blance to glass) is of the form of a sphere, with the anterior portion removed, and constitutes seven eighths of the globe of the eye. It is a transparent fluid enclosed in a transparent membrane, and through its central portion from the entrance of the optic nerve, there passes a small artery to the lens, which supplies it with blood. 688. Lachrymal Gland.—Nasal Duel.—At the outer angle of each eye is found a gland called the Lachrymal gland, nearly three fourths of an inch in length, and of a flattened oval Fig. 348. Posterior View of the Eyelids and Lachrymal G-land. 1, 1, Orbicularis Palbebrarum Muscle. 2, Borders of the Lids. 3, Lachrymal Gland. 4, Its Ducts opening in the Up- per Lid. 5, Conjunctiva covering the Lids. 6, Puncta Lachrymalia. 7, Lachrymal Ca- runcle as seen from behind. shape. (Fig. 348.) Passing from this gland to the eye, are from eight to twelve small ducts, which open upon the under side of the lid near its edge, about one twentieth of an inch apart, wrhich carry the tears to the eye. By continual winking this 687. From what does the vitreous humor get its name? Describe it. CSS. Where are the lachrymal glands situated? What is their size ? How many ducts have they ? What do they secrete ? Of what use is winking?
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