enamel layer

layer /lay·er/ (la´er) a stratum or lamina.

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bacillary layer  l. of rods and cones.

basal layer  stratum basale.

blastodermic layer  germ l.

layers of cerebral cortex  six anatomical divisions (I–VI) of the cerebral cortex (specifically the neocortex), distinguished according to the types of cells and fibers they contain.

clear layer  stratum lucidum.

columnar layer  mantle l.

compact layer of endometrium  stratum compactum.

enamel layer  either of two walls, the inner concave wall or the outer convex wall, of the enamel organ.

functional layer of endometrium  stratum functionale.

ganglionic layer of cerebellum  Purkinje l.

germ layer  any of the three primary layers of cells of the embryo (ectoderm, endoderm, and mesoderm), from which the tissues and organs develop.

germinative layer  stratum germinativum.

granular layer 

1. stratum granulosum.

2. the deep layer of the cortex of the cerebellum.

Henle's layer  the outermost layer of the inner root sheath of the hair follicle.

horny layer  stratum corneum.

malpighian layer  stratum germinativum.

mantle layer  the middle layer of the wall of the primordial neural tube, containing primordial nerve cells and later forming the gray matter of the central nervous system.

odontoblastic layer  the epithelioid layer of odontoblasts in contact with the dentin of teeth.

prickle cell layer  stratum spinosum.

Purkinje layer , Purkinje cell layer the layer of Purkinje neurons situated between the external molecular layer and the internal granular layer of the cerebellar cortex.

layer of rods and cones  a layer of the retina immediately beneath the pigment epithelium, between it and the external limiting membrane, containing the rods and cones.

spinous layer  stratum spinosum.

spongy layer of endometrium  stratum spongiosum.

subendocardial layer  the layer of loose fibrous tissue uniting the endocardium and myocardium and containing the vessels and nerves of the conducting system of the heart.

subepicardial layer  the layer of loose connective tissue uniting the epicardium and myocardium.

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enamel layer

n.

See ameloblastic layer.

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enamel

the white, compact and very hard substance covering and protecting the dentine of the crown of a tooth.

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enamel bulge

the area of greatest diameter of a tooth, just external to the gum line, which acts to deflect food from the free gingival margin and the gingival crevice.

enamel epithelium

epithelium which creates a bell-shaped enamel organ, surrounding the dental papilla; the internal epithelium consists of columnar ameloblasts which secrete enamel.

enamel hypoplasia

incomplete or partial development; a common defect in dogs.

inherited enamel defect

an inherited absence of enamel from all teeth combined with excessive flexibility of joints in Holstein-Friesian cattle. The teeth are pink and obviously deficient in substance. A defect in collagen formation is probable.

enamel layer

the outermost layer of cells of the enamel organ.

mottled enamel

dental fluorosis; defective enamel, with a chalky white appearance or brownish stain, caused by excessive amounts of fluorine in drinking water and food preparations during the period of enamel calcification.

enamel organ

an epithelial cap over a dental papilla that develops into the enamel-producing organ. The shape of the enamel organ determines the shape of the tooth.

enamel points

sharp projections of enamel at the junction of the buccal and occlusal surfaces of a tooth. Seen most commonly in horses.

enamel rods

progressively mineralized glycoproteinaceous tubules, the basic structural units of enamel; enamel is acellular and consists of interrod material and rods,

enamel spot

remnant of the enamel cup in the center of an incisor tooth table in a horse.

Enamel spot. By permission from Sack W, Wensing CJG, Dyce KM, Textbook of Veterinary Anatomy, Saunders, 2002

enamel works

factories manufacturing enamels or using them extensively; sources of fluorine for pollution of pasture and water.