Transcript 14. lateral ventricle

DR. FATIMA HANNEM
MOUSTAFA
LATERAL VENTRICLE
Lateral Ventricle
It is a cavity
present in each
cerebral
hemisphere.
It communicates
with the third
ventricle by the
interventricular
foramen.
It have a dilatation
called collateral
trigone at the
meeting of the
floor of both
inferior and
posterior horns.
Its parts are:
Anterior horn in the frontal
lobe. It lies anterior to the
interventricular foramen.
Central part in the parietal
lobe. It lies behind the
interventricular foramen.
Posterior horn in the
occipital lobe. It begins at
the splenium of the corpus
callosum and extends
posteriorly into the
occipital lobe.
Inferior horn in the
temporal lobe. It passes
downwards behind the
thalamus and then
anteriorly into the
temporal lobe to end the
uncus.
*
**
Anterior horn:
Lateral wall: Head of caudate nucleus
Medial wall: Septum pellucidum*
Roof: Trunk ( body ) of corpus callosum
Floor: Rostrum of corpus callosum**
Anterior wall: Genu of corpus callosum
Central part ( body ):
Roof: Body of corpus callosum
Medial wall: Septum pellucidum
Floor from lateral to medial side:
1- Body of caudate nucleus
2- Stria terminalis ( fibers which arise in
amygdaloid nucleus and pass with the
fornix to grey matter around the anterior
commeissure).
3- Thalamostriate vein
4- Upper part of the thalamus
5- Choroid plexus
6- Fornix which covers the medial part of
the thalamus.
Posterior horn
Its roof and lateral wall are formed by the
tapetum of corpus callosum which is the posterior
fibers of the trunk and fibers of the splenium.
Medial wall presents two elevations:
Superiorly: The bulb of posterior horn which is
produced by the fibers of forceps major that arise
from the splenial fibers.
Inferiorly: The calcar avis which is produced by
infolded cortex of the anterior part of the calcarine
sulcus.
N.B:
Posteriorly, the lateral and the medial walls meet
each other. Or the floor is made by the tapetum.
Inferior horn
Roof: Tail of caudate nucleus and stria terminalis.
Lateral wall: Tapetum of corpus callosum.
Medially: Choroid fissure with choroid plexus.
Floor: from lateral to medial side
1- Collateral eminence ( produced by middle part of
collateral sulcus ).
2- Hippcampus which is covered by a layer of nerve
fibers called alveus.
3- Fimbria which is formed by the fibers of the alveus