Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
A thin sheetlike structure of more or less uniform thickness; a stratum.
The enamel layer of the tooth. Synonym: enamel layer
The rod and cone layer of the retina of the eye.
The outermost layer of the uterine endometrium lying next to the myometrium.Synonym: basilar layer
basilar layerBasal layer.
Bernard glandular layerSee: Bernard glandular layer
choriocapillary layerLamina choriocapillaris.
The layer of gray matter between the external capsule and insula.
The stratum lucidum of the epidermis.
A layer of tall, narrow epithelial cells forming a covering or lining.
The compact surface layer of the uterine endometrium.
cuticular layer of epithelium
A layer of dense cytoplasm at the luminal end of some epithelial cells, esp. that at the surface of columnar epithelium of the intestine.
enamel layerAmeloblastic layer.
The inner layer of cells of the embryonic neural tube.
A population of connective tissue cells that are used to nourish cultured tissue cells in the laboratory. The feeder cell layer is often derived from mouse fibroblasts. Feeder cells supply metabolites to the cells they support, do not grow or divide, and can be inactivated by gamma irradiation.
The portion of the endometrium adjacent to the uterine cavity. After it is shed in menstruation, it is regenerated by the basilar layer.
1. The fifth layer of the cerebral cortex.
2. The inner layer of ganglion cells in the retina whose axons form the fibers of the optic nerve.
Any of the three primary layers of the developing embryo from which the various organ systems develop.See: ectoderm; endoderm; mesoderm
The innermost layer of the epidermis, consisting of a basal layer of cells and a layer of prickle cells (stratum spinosum). Synonym: malpighian layer; stratum germinativum
granular exterior layer
The second layer of the cerebral cortex, consisting of pyramidal cells.
granular interior layer
The fourth layer of the cerebral cortex, consisting principally of closely packed stellate cells.
half-value layerAbbreviation: HVL
The amount of lead, copper, cement, or other material that would dissipate a beam of radiation by 50%. The number of half-value layers required for safety in blocking the area on a patient is five, because that represents 50% of 50% and 50% of that, and so forth. For example, 50% + 25% + 12.5% + 6.23% + 3.12% = 96.9%. Thus the patient would be shielded from all but about 3% of the radiation. (Examples of the thickness of material required to protect from radiation are 2 in [5 cm] of lead or 2 ft [61 cm] of cement.)
Henle's layerSee: Henle, Friedrich G. J.
Outermost layer of the skin, consisting of clear, dead, scalelike cells, those of the surface layer being constantly desquamated. Synonym: stratum corneum
Huxley's layerSee: Huxley, Thomas H.
Langhans' layerSee: Langhans' layer
The middle layer of the neural tube of the developing embryo.
malpighian layerGerminative layer.
1. The outermost layer of the cerebral or cerebellar cortex.
2. The inner or outer plexiform layer of the retina.
molecular layer (of the cerebral cortex)
The most superficial layer of the cortex of the brain, consisting of outer stellate cells and granule cells.
mucus layerMucus barrier.
The nerve-containing portion of the retina of the eye.
The layer of connective tissue cells at the outer edge of the pulp where they produce the dentin of the tooth.
Ollier layerSee: Ollier, Louis Xavier Edouard
osteogenic layerOllier layer.
outer nuclear layer
The layer of the retina containing the nuclei of the visual receptor cells, the rods, and cones.
The superficial layer of the dermis lying immediately under the epidermis into which it extends, forming dermal papillae.Synonym: stratum papillare
The outermost layer of the retina. Cells contain a pigment called fuscin.
prickle cell layer
Stratum spinosum epidermidis; the layer between the granular and basal layers of the skin. Prickle cells are present in this layer.Synonym: spinous layer
Purkinje layerSee: Purkinje layer
The inner layer of the dermis lying beneath the papillary layer.
layer of rods and cones
The layer of the retina of the eye next to the pigment layer. It contains the rods and cones.
In the embryo, a layer of extraembryonic mesoderm that forms a part of the somatopleure, the outer wall of the coelom.
spinous layerPrickle cell layer.
In the embryo, a layer of extraembryonic mesoderm that with the endoderm forms the splanchnopleure.
The middle layer of the uterine endometrium; contains dilated portions of uterine glands. Synonym: stratum spongiosum
The layer of loose connective tissue between the endocardium and the myocardium.
The layer of fine fibers and fibroblasts lying immediately under the endothelium of the tunica intima of larger arteries and veins.
Tomes' granular layer
The layer of interglobular dentin beneath the dentinocemental junction in the root of a tooth.
Weil's basal layer
A relatively cell-free zone just below the odontoblastic layer in the dental pulp. It is also called subodontoblastic layer; cell-free zone of Weil; cell-poor zone.