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Word of the Day

lamina

(lam′ĭ-nă)

pl. laminae [L. lamina, thin plate]

1. A thin flat layer or membrane.
2. The flattened part of either side of the arch of a vertebra.
The alar plate of the neural tube, which later develops into sensory nuclei and tracts of the central nervous system. SEE: Alar plate. SEE: Bowman, Sir William An 80 nm thick extracellular layer of fibrils and proteoglycans along the basal surface of a variety of cells, including many epithelia, capillary endothelia, Schwann cells, and muscle cells. Basal laminae anchor cells, organize cell-cell interactions, and act as semipermeable membranes. SEE: Bruch's membrane.
SEE: Bruch, Karl The membranous portion of the spiral lamina of the cochlea of the inner ear. SEE: Bowman, Sir William The posterior portion of the cricoid cartilage. The middle layer of the choroid, containing a dense mesh of capillaries.
SYN: choriocapillary layer; Ruysch's membrane The cribriform plate of the ethmoid bone. The portion of the sclera forming a sievelike plate through which pass fibers of the optic nerve to the retina. A U-shaped internal growth of the oral epithelium in the embryonic maxillary and mandibular regions that forms into enamel organs which produce the teeth.
SEE: enamel organ In radiography, the compact bone (alveolar bone proper) that surrounds the roots of teeth. In a state of health, it appears on a radiograph as a dense radiopaque line. The epithelial layer covering the choroid layer of the eye. The layer of thin pigmented connective tissue on the inner surface of the sclera of the eye. The layer of white matter that divides the gray matter of the thalamus into three parts: anterior, medial, and lateral. Part of the articulation of the pubic bones, connecting the opposing surfaces of these bones. A thickened band of epithelium that grows from the ectodermal covering of the embryonic jaw. The ectodermal plate splits and separates the lip from the gum. The polymorphic layer of the isocortex of the cerebral cortex. A thin, smooth plate of bone on the lateral surface of the ethmoid bone; it forms part of the orbital plate. A thin sheet of bone forming the perpendicular plate of the ethmoid bone. It supports the upper portion of the nasal septum. The thin layer of areolar connective tissue, blood vessels, and nerves that lies immediately beneath the surface epithelium of mucous membranes. Either of two plates, the internal and external, that make up the pterygoid process of the sphenoid bone. They are areas of attachment for the muscles of mastication. The two pairs of bulges on the top of the midbrain section of the brainstem. The rostral pair are the superior colliculi, which are concerned with visual stimuli. The caudal pair are the inferior colliculi, which are concerned with auditory stimuli. Synonymous with tectum. A continuation of the rostrum of the corpus callosum and the terminal lamina of the third ventricle of the brain. A thin, bony plate projecting from the modiolus into the cochlear canal, dividing it into two portions, the upper scala vestibuli and lower scala tympani.
SYN: lamina spiralis SEE: Spiral lamina. The superficial layer of the choroid consisting of thin transparent layers, the outermost adhering to the sclera.
SEE: lamina suprachoroidea
SYN: suprachoroidea The outermost layer of the choroid. The frontmost (rostral) wall of the neural tube. In the developed brain, the lamina terminalis remains as the thin rostral wall of the third ventricle, stretching from the bases of the major cerebral commissures (the anterior commissure, the commissure of the fornix, and the rostrum of the corpus callosum) to the dorsal surface of the optic chiasm. One of the laminae extending from the pedicles of the vertebral arches and fusing together to form the dorsal portion of the arch. The spinous process extends from the center of these laminae. SEE: Labial lamina. SEE: Bruch membrane. The outer or plexiform layer of the isocortex of the brain. RSS FEED

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