The lateral ventricle consists of two large, C-shaped cavities in each cerebral hemisphere, with various parts including the body, anterior horn, inferior horn, and posterior horn. Each lateral ventricle holds 7 to 10 ml of cerebrospinal fluid, which is produced by the choroid plexus and drains into the third ventricle via the interventricular foramen. Blockage of this foramen can lead to hydrocephalus, and the choroid plexus may calcify with age, which should not be mistaken for pineal gland calcification.

1. LATERAL VENTRICLE

2. There are two large lateral ventricles, and one is present in
each cerebral hemisphere. The ventricle is a roughly C-
shaped cavity and may be divided into a
 body - occupying parietal lobe
 anterior horn - occupying frontal lobe
 inferior horn - occupying temporal lobe
 posterior lobe - occupying occipital lobe
BODY OF LATERAL VENTRICLE
Extends from the interventricular foramen posteriorly as far
as the posterior end of the thalamus anteriorly.
Consist of roof, floor and medial wall.

3. ROOF
Formed by the undersurface of the corpus callosum
FLOOR
Formed by the body of the caudate nucleus and the lateral margin of the thalamus.
MEDIAL WALL
Formed by the septum pellucidum anteriorly; posteriorly, the roof and the floor come
together on the medial wall.

5. ANTERIOR HORN
extends forward into the frontal lobe. It is continuous posteriorly with the
body of the ventricle at the interventricular foramen. The anterior horn
has a roof, a floor, and a medial wall
ROOF
Formed by the undersurface of the anterior part of the corpus callosum; the genu
of the corpus callosum limits the anterior horn anteriorly.
FLOOR
Formed by the rounded head of the caudate nucleus
MEDIAL WALL
Formed by the septum pellucidum and the anterior column of the fornix

7. POSTERIOR HORN
extends posteriorly into the occipital lobe
ROOF AND LATERAL WALL
Formed by the fibers of the tapetum of the corpus callosum.
MEDIAL WALL
Has two elevations:
1. superior elevation: caused by the splenial fibers of the corpus callosum,
called the forceps major, passing posteriorly into the occipital lobe; this
superior swelling is referred to as the bulb of the posterior horn
2. inferior elevation: produced by the calcarine sulcus and is called the
calcar avis

9. INFERIOR HORN
extends anteriorly into the temporal lobe The inferior horn has
a roof and a floor.
ROOF
formed by the inferior surface of the tapetum of the corpus
callosum and by the tail of the caudate nucleus
FLOOR
formed laterally by the collateral eminence, produced by the
collateral fissure, and medially by the hippocampus

11. CLINICAL SIGNIFICANCE
 Each lateral ventricle contains about 7 to 10 mL of cerebrospinal
fluid. This fluid is produced in the choroid plexus of the lateral
ventricle and normally drains into the third ventricle through the
interventricular foramen (foramen of Monro). Blockage of the
foramen by a cerebral tumor would result in distention of the
ventricle, thus producing a type of hydrocephalus.
 The choroid plexus of the lateral ventricle is continuous with that of
the third ventricle through the interventricular foramen. The
choroid plexus is largest where the body and posterior and inferior
horns join, and it is here where it may become calcified with age. It
is important that this calcification of the choroid plexus, as seen on
radiographs, is not confused with that of the pineal gland