basal membrane

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Related to basal membrane: basal lamina

basal membrane

a sheet of tissue that forms the outer layer of the choroid and lies just under the pigmented layer of the retina. It is composed of elastic fibers in an otherwise thin homogenous layer.


pertaining to or situated near a base; in physiology, pertaining to the lowest possible level.

basal body
the structure that acts as a template for the characteristic 9 + 2 arrangement of the microtubules of eukaryotic cilia and flagella.
basal cell tumors
neoplasms of the multipotential cells within the stratum germinativum of the skin. They are common in dogs and cats, are locally expansive and do not metastasize.
basal energy requirements (BER)
see energy requirements.
basal ganglia
a collection of masses of gray matter at the base of the cerebral hemispheres, subthalamus and midbrain which are responsible for much of the organization of the activity of somatic muscles. The individual nuclei are the caudate nucleus, putamen, globus pallidus, endopeduncular nucleus, subthalamic nucleus and the substantia nigra. Other nuclei which have a similar function but are usually not included in the group are the amygdaloid nuclei and the red nucleus.
basal layer
see stratum basale.
basal membrane
the deepest layer of the epidermis in the avian skin. Called also dermoepidermal junction.
basal metabolic rate
see metabolic rate.
basal metabolism
the minimal energy expended for the maintenance of respiration, circulation, peristalsis, muscle tonus, body temperature, glandular activity and the other vegetative functions of the body. See also metabolic rate.
basal metabolism test
a method of measuring the body's expenditure of energy by recording its rate of oxygen intake and consumption. Once a major test of thyroid gland function, it is being replaced by diagnostic tests requiring less extensive preparation and capable of producing more accurate test results, e.g. the determination of the levels of thyroid hormones in the blood and the radioiodine uptake test.
basal nuclei
see basal ganglion.
basal plate
the ventral plate of the developing neural tube of the embryo; associated with motor output from the CNS.
basal tone
degree of contractile tension remaining in blood vessels after complete elimination of all external excitatory influences.
References in periodicals archive ?
Atrophic antrum-gastritis in children was characterized not only by the alteration of mucosal cytoarchitecture (the reduced volume of foveae and glands), but also by the reduced number of functionally mature cell forms responsible for the production of extracellular matrix components and basal membranes, the absence of which in paraepithelial localization results in the change of specific properties of basal membranes and, subsequently, the reduction of environmental resistance of epithelium.
The structure of basal membrane that was PAS positive stained around the tubule was observed to be normal (Figure 5b, c).
00) unbranched dorsal and ventral rays respectively, middle rays branched, fin reaching posteriorly to a vertical line between anterior margin of urogenital papilla and base of first ray of anal fin; pelvic fin I 5, no frenum, basal membrane poorly developed, 7-17- 18% length of fifth pelvic ray), first four rays with one or two sequential branch points, fifth ray branched once and 52-61-70% length of fourth ([bar.
Ultra structural study of gray substance of the brain revealed disturbances of all structures of the walls of capillaries that make up the blood-brain barrier: endothelial cells, basal membrane pericytes.
During the second phase, germ cells divide in the basal membrane (mitosis) and form a cellular monolayer.
Basal stratum degeneration and thickening of the basal membrane were also seen as congruent with previous studies.
However, in the group treated with dexamethasone, the blastema developed less and the cells of the epithelium basal layer were not yet cylindrical, which is an essential characteristic for the synthesis of the basal membrane (Figures 4 and 5).
The basal membrane was segregated and exposed to natural light for 1 hour.
Scattered regenerative cells nests were present at the base of the digestive cells, close to the basal membrane.
They usually hyper chromed and localized in the different distances from the basal membrane and sometimes in the nearest epithelium surface.
2,15) Molecular and immunohistochemical studies have shown that laminin-5, a basal membrane glycoprotein, is one of the most prominent autoantigens in cicatricial penphigoid.