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

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

Ligule :: Ligule (n.) A band of white matter in the wall of fourth ventricle of the brain.

Intraventricular :: Intraventricular (a.) Within or between ventricles.

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..

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

Praecornu :: Praecornu (n.) The anterior horn of each lateral ventricle of the brain.

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

Proventricle :: Proventricle (n.) Proventriculus.

Ventricular :: Ventricular (a.) Of or pertaining to a ventricle; bellied.

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

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

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..

Calcar :: Calcar (n.) A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot..

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

Thalamocoele :: Thalamocoele (n.) The cavity or ventricle of the thalamencephalon; the third ventricle.

Scutibranchiata :: Scutibranchiata (n. pl.) An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

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

Iter :: Iter (n.) A passage; esp., the passage between the third and fourth ventricles in the brain; the aqueduct of Sylvius..

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

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