[1][2] Between the inferior horn and the main body of the ventricle is the putamen, which emerges from the head of the caudate nucleus, and sits above the tapetum; a small number of further connections passing through the occipital tapetum to join the putamen to portions of the caudate nucleus tail adjoining the anterior horn.

The thalamus primarily communicates with the structures bounding the lateral ventricles via the globus pallidus, and the anterior extremities of the fornix (the mamillary bodies).

It is separated from the anterior horn of the other lateral ventricle by a thin neural sheet - septum pellucidum, which thus forms its medial boundary.

Immediately below the tail of the caudate nucleus, the next portion of the lateral edge is formed by the comparatively narrow stria terminalis, which sits upon the superior thalamostriate vein.

The main part of the fornix of the brain forms the next narrow portion of the lateral boundary, which is completed medially by a choroid plexus, which serves both ventricles.

[1] The stria terminalis forms the remainder of the roof, which is narrower than at the body, and the choroid plexus occupies the medial wall.

[1] As with the posterior horn, the remainder of the boundary (in this case, the lateral side of the floor) is directly in contact with the white matter of the surrounding lobe.

[1] The lateral ventricles, similarly to other parts of the ventricular system of the brain, develop from the central canal of the neural tube.

During the first three months of prenatal development, the central canal expands into lateral, third, and fourth ventricles, connected by thinner channels.

The neural canal that does not expand and remains the same at the level of the midbrain superior to the fourth ventricle forms the cerebral aqueduct.