By E. Ahmed
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Extra resources for A Textbook of Opthalmology
The facial system is composed of (a) the facial artery, (b) the superficial temporal artery consisting o f the transverse facial, the frontal and the zygomaticoorbital, and (c) the infraorbital artery. The orbital system or the branches of the ophthalmic artery consists of (a) the dorsal nasal artery, (b) the frontal artery, (c) the supraorbital artery, and (d) the lacrimal artery. The deeper structures are supplied by four palpebral arcades, two in each lid and one at either border of the tarsus: (a) the medial palpebral— from the dorsal nasal branch of the ophthalmic artery, and (b) the lateral palpebral—from the lacrimal artery, branch of the ophthalmic.
It holds the cells and the fibres and forms a gel. Descemet’s Membrane Descemet’s membrane is a strong, homogeneous membrane of 10-12 millimicron. There is a line of demarcation between it and the stroma, the line being utilized during lamellar keratoplasty. At its periphery the posterior surface of the membrane shows some round elevations, H assall-H enle bodies, having a tendency to increase with age. Endothelium The endothelium is the posteriormost layer and consists of a single layer of flattened epithelium like cells, continuous round the angle of the anterior chamber with the endothelium of the iris.
2 Structures seen in a vertical section of the upper lid: 1, skin; 2, eyelashes with gland of zeis; 3, orbicularis oculi; 4, levator palbebrae superioris; 5, Meibomian glands; 6, opening of Meibomian gland; 7, Krause’s glands; 8, glands of Wolfring; and 9, conjuctiva. is loose and delicate, containing no fat. The palpebral fibres o f the orbicularis oculi run parallel to the palpebral fissure. The submuscular areolar tissue communicates with the subaponeurotic layer of the scalp. It is traversed by the fibres of the levator, palpebrae superioris and the nerves to the eyelids, and through this plane the lid can be halved into an anterior and posterior portion.
A Textbook of Opthalmology by E. Ahmed