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Brain :: Brain (n.) The whitish mass of soft matter (the center of the nervous system, and the seat of consciousness and volition) which is inclosed in the cartilaginous or bony cranium of vertebrate animals. It is simply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three seg

Homogeny :: Homogeny (n.) The correspondence of common descent; -- a term used to supersede homology by Lankester, who also used homoplasy to denote any superinduced correspondence of position and structure in parts embryonically distinct (other writers using the term homoplasmy). Thus, there is homogeny between the fore limb of a mammal and the wing of a bird; but the right and left ventricles of the heart in both are only in homoplasy with each other, these having arisen independently since the divergence

Medicornu :: Medicornu (n.) The middle or inferior horn of each lateral ventricle of the brain.

Medicommissure :: Medicommissure (n.) A large transverse commissure in the third ventricle of the brain; the middle or soft commissure.

Interventricular :: Interventricular (a.) Between the ventricles; as, the interventricular partition of the heart..

Fornix :: Fornix (n.) Esp., two longitudinal bands of white nervous tissue beneath the lateral ventricles of the brain..

Choroid :: Choroid (a.) resembling the chorion; as, the choroid plexuses of the ventricles of the brain, and the choroid coat of the eyeball..

Hippocampus :: Hippocampus (n.) A name applied to either of two ridges of white matter in each lateral ventricle of the brain. The larger is called hippocampus major or simply hippocampus. The smaller, hippocampus minor, is called also ergot and calcar..

Ventricle :: Ventricle (n.) The stomach.

Neurocoele :: Neurocoele (n.) The central canal and ventricles of the spinal cord and brain; the myelencephalic cavity.

Hydrocephalus :: Hydrocephalus (n.) An accumulation of liquid within the cavity of the cranium, especially within the ventricles of the brain; dropsy of the brain. It is due usually to tubercular meningitis. When it occurs in infancy, it often enlarges the head enormously..

Pseudocoelia :: Pseudocoelia (n.) The fifth ventricle in the mammalian brain. See Ventricle.

Ventricle :: Ventricle (n.) Fig.: Any cavity, or hollow place, in which any function may be conceived of as operating..

Teretial :: Teretial (a.) Rounded; as, the teretial tracts in the floor of the fourth ventricle of the brain of some fishes..

Infundibulum :: Infundibulum (n.) A funnel-shaped or dilated organ or part; as, the infundibulum of the brain, a hollow, conical process, connecting the floor of the third ventricle with the pituitary body; the infundibula of the lungs, the enlarged terminations of the bronchial tubes..

Thalamus :: Thalamus (n.) A mass of nervous matter on either side of the third ventricle of the brain; -- called also optic thalamus.

Procoele :: Procoele (n.) A lateral cavity of the prosencephalon; a lateral ventricle of the brain.

Aqueduct :: Aqueduct (n.) A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain..

Praecommissure :: Praecommissure (n.) A transverse commissure in the anterior part of the third ventricle of the brain; the anterior cerebral commissure.

Terma :: Terma (n.) The terminal lamina, or thin ventral part, of the anterior wall of the third ventricle of the brain..

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