A thin sheetlike structure of more or less uniform thickness.
SEE: Enamel layer
The rod and cone layer of the retina.
The outermost layer of the uterine endometrium lying next to the myometrium.
SYN: SEE: basilar layer
SEE: Basal layer.
The layer of gray matter between the external capsule and insula.
The stratum lucidum of the epidermis.
SEE: stratum lucidum
A layer of tall, narrow epithelial cells forming a covering or lining.
The dense surface layer of the uterine endometrium.
A layer of dense cytoplasm at the luminal end of some epithelial cells, esp. the layer at the surface of columnar epithelium of the intestine.
The inner layer of cells of the embryonic neural tube.
A layer 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 basal layer.
SEE: basal 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.
The second layer of the cerebral cortex, consisting of pyramidal cells.
The fourth layer of the cerebral cortex, consisting principally of closely packed stellate cells.
ABBR: 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.)
SEE: Stratum corneum.
SEE: Huxley, Thomas H.
SEE: Langhans layer
SEE: Germinative layer.
The middle layer of the neural tube of the developing embryo.
1. The outermost layer of the cerebral or cerebellar cortex.
2. The inner or outer plexiform layer of the retina.
The most superficial layer of the cortex of the brain, consisting of outer stellate cells and granule cells.
A thick, slippery coating of glycoproteins and other secreted organic chemicals that line and protect the intestinal epithelium.
SYN: SEE: mucus barrier
The portion of the retina that contains the nerves
The layer of connective tissue cells at the outer edge of the pulp where the cells produce the dentin of the tooth.
The inner layer of the periosteum. It contains osteoblasts that become active during repair of fractures.
SYN: SEE: Ollier 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.
SYN: SEE: stratum papillare
SEE: Spinous layer
SEE: Purkinje layer
The inner layer of the dermis lying beneath the papillary layer.
The layer of the retina of the eye next to the pigment layer. It contains the rods and cones.
SEE: pigment layer
In the embryo, a layer of extraembryonic mesoderm that forms a part of the somatopleure.
In the embryo, a layer of extraembryonic mesoderm that with the endoderm forms the splanchnopleure.
The middle layer of the uterine endometrium, containing dilated portions of uterine glands.
SYN: SEE: 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.
A relatively cell-free zone just below the odontoblastic layer in the dental pulp.
SYN: SEE: Weil basal layer
The layer of interglobular dentin beneath the dentinocemental junction in the root of a tooth.