New PDF release: A Textbook of Opthalmology

By E. Ahmed

ISBN-10: 8120319168

ISBN-13: 9788120319165

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Extra info for A Textbook of Opthalmology

Example text

Margin. This is made up o f three bones: the frontal, zygomatic and maxilla. There are four portions: superior, inferior, medial, and lateral. Apex. The apex corresponds to the optic foramen. Average dimensions. 1 indicates average dimensions of the orbit. 1 Average Dimensions of the Orbit Each orbital margin 40 mm Width of orbital opening 40 mm Height of orbital opening 35 mm Interorbital distance 25 mm Extraorbital distance 100 mm Length of sphenoid fissure 22 mm Distance between intracranial openings of 2opticcanals 25 mm orbital openings of 2 opticcanals 30 mm Orbital volume 30 ml Supraorbital notch for supraorbital vessels and Superciliary arch F ossa for lacrimal (i) mesosemes (intermediate): index between 83-89 (ii) megasemes (large): index more than 89 (iii) microsemes (small): index less than 83.

The nuclei of the sixth nerve lie in the pons beneath the floor of the upper part o f the fourth ventricle. The third nerve nucleus is divided as follows (Fig. 9). 4 and Fig. 9 give a brief account of this nuclear complex. 4 Subdivisions of the Oculomotor Nuclear Complex Fig. 7 Schematic view of a horizontal section through the right orbit to illustrate the fascia of the orbit. The fascia bulbi or Tenon’s capsule, is shown by A, its anterior part, and P, its posterior part. ” The drawing also illustrates certain points in the anatomy of the eyelids.

8 per cent solids. 1. 1 The Solid C om ponents o f Tear G lucose approx. 04 mg/dL Tear is secreted by the lacrimal gland and collected by 10 to 12 lacrimal ducts extending toward the superior conjunctival fornix. 2 Two pathways are involved in the secretion of water and electrolytes: cholinergic-activated, and vasoactive intestinal peptide-activated. Three pathways involved in the secretion of protein are: cholinergic agonistactivated, alpha adrenergic agonist-activated and AMP-dependent. Normal secretion is sufficient to keep the eyeball moist.

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A Textbook of Opthalmology by E. Ahmed

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