lamina
(lam'ĭ-nă 
, lam'ĭ-nē‵, lam'ĭ-nī‵)
Plural: laminae
[L. lamina, thin plate]
- A thin flat layer or membrane.
- The flattened part of either side of the arch of a vertebra.
alar l.The alar plate of the neural tube, which later develops into sensory nuclei and tracts of the central nervous system.
alar l. of neural tube Alar plate.
SEE: under Bowman, Sir William.
basal l.An 80-nm thick extracellular lamina of fibrils and proteoglycans along the basal surface of a variety of cells, including many epithelial, capillary endothelial, Schwann cells, and muscle cells. Basal laminae anchor cells, organize cell-to-cell interactions, and act as semipermeable membranes.
l. basalis choroideae Bruch membrane.
SEE: under Bruch, Karl.
l. basilaris ductus cochlearis The membranous portion of the spiral lamina of the cochlea of the inner ear.
SEE: under Bowman, Sir William.
l. cartilaginis cricoideae The posterior portion of the cricoid cartilage.
l. choriocapillaris The middle layer of the choroid, containing a dense mesh of capillaries. SYN: choriocapillary layer; Ruysch membrane.
l. cribrosa The cribriform plate of the ethmoid bone.
l. cribrosa sclerae The portion of the sclera forming a sievelike plate through which pass fibers of the optic nerve to the retina.
dental l.A U-shaped internal growth of the oral epithelium in the embryonic maxillary and mand ibular regions that forms into enamel organs which produce the teeth.
SEE: enamel organ.
l. dura 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.
epithelial l.The epithelial layer covering the choroid layer of the eye.
l. fusca sclerae The layer of thin pigmented connective tissue on the inner surface of the sclera of the eye.
internal medullary l.The layer of white matter that divides the gray matter of the thalamus into three parts: anterior, medial, and lateral.
interpubic fibrocartilaginous l.Part of the articulation of the pubic bones, connecting the opposing surfaces of these bones.
labial l.A thickened lamina of epithelium that grows from the ectodermal covering of the embryonic jaw. The ectodermal plate splits and separates the lip from the gum. SYN: vestibular lamina.
l. multiformis The polymorphic lamina of the isocortex of the cerebral cortex.
l. papyracea A thin, smooth lamina of bone on the lateral surface of the ethmoid bone; it forms part of the orbital plate.
perpendicular l.A thin lamina of bone forming the perpendicular plate of the ethmoid bone. It supports the upper portion of the nasal septum.
l. propria mucosae The thin lamina of areolar connective tissue, blood vessels, and nerves that lies immediately beneath the surface epithelium of mucous membranes.
pterygoid l.Either of two laminae, the internal (medial) and external (lateral), that make up the pterygoid process of the sphenoid bone. They are areas of attachment for the muscles of mastication.
l. quadrigemina The two pairs of bulges on the top of the midbrain tectum (roof). The rostral pair are the superior colliculi (concerned with visual stimuli); the caudal pair are the inferior colliculi (concerned with auditory stimuli).
rostral l.A continuation of the rostrum of the corpus callosum and the terminal lamina of the third ventricle of the brain.
spiral l.A thin, bony lamina projecting from the modiolus into the cochlear canal, dividing it into two portions, the upper scala vestibuli and the lower scala tympani. SYN: lamina spiralis.
suprachoroid l.The superficial layer of the choroid consisting of thin transparent layers, the outermost adhering to the sclera. SYN: suprachoroidea.
SEE: lamina suprachoroidea.
l. suprachoroidea The outermost layer of the choroid.
l. terminalis 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.
l. of vertebral arch One of the laminae extending from the pedicles of the vertebral arches and fusing to form the dorsal (posterior) portion of the arch. The spinous process extends from the center of these laminae.
l. zonalis The outer plexiform layer of the isocortex of the brain.