alar lamina of neural tube


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a·lar lam·i·na of neu·ral tube

the posterior (dorsal) division of the lateral walls of the neural tube in the embryo; it gives rise to neurons relaying afferent impulses to higher centers; in the adult such neurons compose the sensory nuclei of the spinal cord and brainstem.

a·lar plate of neu·ral tube

(ā'lăr plāt nūr'ăl tūb)
The dorsal division of the lateral walls of the neural tube.
Synonym(s): alar lamina of neural tube.

lamina

(lam'i-na) plural.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.

alar lamina

The alar plate of the neural tube, which later develops into sensory nuclei and tracts of the central nervous system.

alar lamina of neural tube

Alar plate.

anterior elastic lamina

See: Bowman, Sir William

basal lamina

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.

lamina basalis choroideae

Bruch's membrane. See: Bruch, Karl

lamina basilaris ductus cochlearis

The membranous portion of the spiral lamina of the cochlea of the inner ear.

Bowman lamina

See: Bowman, Sir William

lamina cartilaginis cricoideae

The posterior portion of the cricoid cartilage.

lamina choriocapillaris

The middle layer of the choroid, containing a dense mesh of capillaries.
Synonym: choriocapillary layer; Ruysch's membrane

lamina cribrosa

The cribriform plate of the ethmoid bone.

lamina cribrosa sclerae

The portion of the sclera forming a sievelike plate through which pass fibers of the optic nerve to the retina.

dental lamina

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

lamina 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 lamina

The epithelial layer covering the choroid layer of the eye.

lamina fusca sclerae

The layer of thin pigmented connective tissue on the inner surface of the sclera of the eye.

internal medullary lamina

The layer of white matter that divides the gray matter of the thalamus into three parts: anterior, medial, and lateral.

interpubic fibrocartilaginous lamina

Part of the articulation of the pubic bones, connecting the opposing surfaces of these bones.

labial lamina

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.

lamina multiformis

The polymorphic layer of the isocortex of the cerebral cortex.

lamina papyracea

A thin, smooth plate of bone on the lateral surface of the ethmoid bone; it forms part of the orbital plate.

perpendicular lamina

A thin sheet of bone forming the perpendicular plate of the ethmoid bone. It supports the upper portion of the nasal septum.

lamina propria mucosae

The thin layer of areolar connective tissue, blood vessels, and nerves that lies immediately beneath the surface epithelium of mucous membranes.

pterygoid lamina

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.

lamina quadrigemina

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.

rostral lamina

A continuation of the rostrum of the corpus callosum and the terminal lamina of the third ventricle of the brain.

spiral lamina

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.
Synonym: lamina spiralis

lamina spiralis

Spiral lamina.

suprachoroid lamina

The superficial layer of the choroid consisting of thin transparent layers, the outermost adhering to the sclera. See: lamina suprachoroidea Synonym: suprachoroidea

lamina suprachoroidea

The outermost layer of the choroid.

lamina 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.

lamina of vertebral arch

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.

vestibular lamina

Labial lamina.

lamina vitrea

Bruch membrane.

lamina zonalis

The outer or plexiform layer of the isocortex of the brain.