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A large transverse commissure in the third ventricle of the brain; the middle or soft commissure. B. G. Wildex.

The middle or inferior horn of each lateral ventricle of the brain. B. G. Wilder.

ng to a miter; resembling a miter; as, the mitral valve between the left auricle and left ventricle of the heart.

The central canal and ventricles of the spinal cord and brain; the myelencephalic cavity.

; resembling a pine cone. Pineal gland (Anat.), a glandlike body in the roof of the third ventricle of the vertebrate brain; -- called also pineal body, epiphysis, conarium. In some animals it is connected with a rudimentary eye, the so-called pineal eye, and in other animals it is supposed to be the remnant of a dorsa…

A transverse commisure in the posterior part of the roof of the third ventricle of the brain; the posterior cerebral commisure. B. G. Wilder.

The posterior horn of each lateral ventricle of the brain. B. G. Wilder.

A transverse commissure in the anterior part of the third ventricle of the brain; the anterior cerebral commissure.

The anterior horn of each lateral ventricle of the brain. B. G. Wilder.

A lateral cavity of the prosencephalon; a lateral ventricle of the brain. B. G. Wilder.

The fifth ventricle in the mammalian brain. See Ventricle. B. G. Wilder.

usually covered with scales or bony plates. The heart generally has two auricles and one ventricle. The development of the young is the same as that of birds.

An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

the aorta and of the pulmonary artery which prevent the blood from flowing back into the ventricle.

e fibers only. The center of the cord is traversed by a slender canal connecting with the ventricles of the brain.

Rounded; as, the teretial tracts in the floor of the fourth ventricle of the brain of some fishes. Owen.

The terminal lamina, or thin ventral part, of the anterior wall of the third ventricle of the brain. B. G. Wilder.

The cavity or ventricle of the thalamencephalon; the third ventricle.

A mass of nervous matter on either side of the third ventricle of the brain; -- called also optic thalamus.

of three triangular membranous flaps, at the opening of the right auricle into the right ventricle in the heart of most mammals; -- sometimes called the tricuspid valves, each flap being regarded as a valve.