Layer

(la'-er). A ma of uniform, or nearly uniform, thickne , spread over or covering a considerable area. L., Bacillar (of the retina), the layer of rods and cones of the retina. L., Basement, basement membrane, q. v. L., Bowman's. See Lamina , Bou-man's. L., Fibrous. L., Fundamental, one of the three layers of the blastoderm, q. v. L., Ganglionic, a layer of angular cells of the cerebral cortex, best developed in the motor area. L., Germinal. See L., Fundamental. L., Henle's, the outer layer of the inner root-sheath of the hair. Huxley's, the inner layer of the inner root-sheath of the hair. L., Horny (of the epiderm), the superficial layer of the skin. L., Inner Molecular, one of the layers of the retina. L., Latticed, the formatio reticular is, q. v. L., Malpighian, the rete mucosum of the skin. L., Ollier's. See Z., Osteogenetic. L., Osteogenetic, the lower layer of periosteum, connected with the formation of bone. L., Papillary (of the skin), the upper layer of the true skin, having papillary projections fitting into the epidermis. L., Pigmentary (of the retina), the innermost layer of cells of the retina extending also to the choroid, ciliary body, and iris. L., Primitive, or Primordial, the layers of the blastoderm; by some applied to epiblast, hypoblast, and mesoblast; by others to the first two only. L. of Rods and Cones. See Z., Bacillar, and Retina. L., Serous, the ental layer of serous membranes, consisting of endothelium.