Читать книгу Essentials of Veterinary Ophthalmology - Kirk N. Gelatt - Страница 53

The lens fibers are completely enclosed within a thick, PAS‐positive capsule, which is the exaggerated basement membrane of the lens epithelium. It has elastic properties but no elastic fibers. The thickness of the capsule varies by region, with the thinnest being the posterior pole. The canine lens capsule thickness is 8–12 μm at the equator, 50–70 μm anteriorly, and only 2–4 μm posteriorly.

Figure 1.47 Composite drawing of the lens, capsule, attachments, and nuclear zones. The lens epithelial cells line the anterior capsule. At the equator, these dividing cells elongate to form lens cortical cells (fibers). As they elongate anteriorly and posteriorly toward the sutures, their nuclei migrate somewhat anterior to the equator and form the lens bow. Zonular fibers (zf) attach to the anterior and posterior lens capsule and to the equatorial capsule, forming pericapsular or zonular lamellae of the lens.