By E. Ahmed
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Extra resources for A Textbook of Opthalmology
Keratocytes are mostly interlamellar and occasionally intralamellar. Descemet's membrane. There are two portions: anterior, banded showing interdigitations between the fine filaments, the foetal part, constituting onethird portion. The posterior two-third, the postnatal part, forms the nonbanded zone showing a granular appearance. Endothelium. 000 cells, each of 5 millimicron thin and 10-20 millimicron wide. These are extremely metabolically active cells. Large num bers o f m itochondria are found particularly around the nucleus.
2. ANATOMY OF THE EYELIDS13 The eyelids (Fig. 1) are movable folds to protect the eye from external injury, excessive light and undue exposure, to facilitate the distribution of tear and glandular secretions, and to help in the regulation of the amount of light reaching the retina. The palpebral fissure is an elliptical space, 30 mm long x 10 mm wide, between the upper and lower lid margins when the eye is open. The eyelids unite laterally at an acute angle lying in direct continuity with the globe (lateral canthus) and medially at a rounded angle (medial canthus) in which there are two structures namely the caruncle and plica semilunaris.
The nerve follows a long course along the base of the brain and pierces the dura matera lateral to the dorsum sellae to enter the cavernous sinus. It then follows the same route as that of the third and fourth nerves. The facial (W ith) nerve [Fig. 11]. The facial nerve has got two roots—the motor and the sensory. • The ophthalmic nerve lies in the lateral wall of the cavernous sinus, and then it enters the orbit through the superior orbital fissure. It supplies the skin of the face and scalp, and supplies sensory fibres to the conjunctiva, comea, iris and possibly secretory fibres to the lacrimal gland.