Figure 7 lens human HE x360

This micrograph shows a portion of the lens near its equator. The lens consists entirely of epithelial cells surrounded by a homogeneous-appearing lens capsule (LC) to which the zonula fibers attach. The lens capsule is a very thick basal lamina of the epithelial cells. Simple cuboidal lens epithelial cells are present on the anterior surface of the lar connective tissue. Together, this epithelium and underlying connective tissue represents the conjunctiva (Cj). The white opaque appearance of the sclera is due to the irregular dense arrangement of the collagen fibers that make up the stroma (5). The canal of Schlemm (CS) is seen at the left close to the inner surface of the sclera.

corneal epithelium, is just perceptible but disappears beneath the conjunctival epithelium. Figure 3 shows at higher magnification of the canal of Schlemm (CS) than does Figure 1. That the space shown here is not an artifact is evidenced by the endothelial lining cells (En) that face the lumen.

artifacts). Nuclei (N) of the keratocytes of the stroma lie between lamellae. The corneal epithelium rests on a thickened anterior basement membrane called Bowman's membrane (B). The posterior surface of the cornea is lined by a simple squamous epithelium called the corneal endothelium (CEn); its thick posterior basement membrane is called Descemet's membrane (D).

has a homogeneous appearance, a reflection of the dense packing of its collagen fibrils. The flattened nuclei belong to the keratocytes. Figure 6 shows the posterior surface of the cornea. Note the thick homogeneous Descemet's membrane (D) and the underlying corneal endothelium (CEn).

lens, but at the lateral margin they become extremely elongated and form layers that extend toward the center of the lens. These elongated columns of epithelial cytoplasm are referred to as lens fibers (LF). New cells are produced at the margin of the lens and displace the older cells inwardly. Eventually, the older cells lose their nuclei, as evidenced by the deeper portion of the cornea in this micrograph.

Was this article helpful?

0 0

Post a comment