THIRD VENTRICLE
- The third ventricle is one of the fluid-filled cavities within the brain.
* Within the ventricles the are specialized structures wich called Choroid Plexus that produce cerebrospinal fluid.
Location:
- Located in the midline between the two halves (hemispheres) of the thalamus.
- It is a part of the diencephalon.
Boundaries:
- → Anteriorly - the third ventricle communicate with the lateral ventricle through the interventricular foramena.
- → Posteriorly - it narrows and continues as the cerebral aqueduct, connecting to the fourth ventricle in the brainstem.
- → Lateraly - formed by the thalamus on each side.
- → Floor - Composed of the hypothalamus.
Recesses:
- The cavity of the 3rd ventricle extends into 4 recesses:
1. The Supra-optic recess:
located superior to the optic chiasm & inferior to the lamina terminalis.
2. The Infundibular recess
Is found on the floor of the third ventricle, between the optic chiasm and the mamillary body.
3. The pineal recess:
Extends posteriorly, project into the pineal body between the cranial & caudal lamina of the pineal gland.
4. The suprapineal recess.
Located between the superior portion of the pineal gland & the inferi r aspect of the tela choroidea
↳ Combination of pia mater & ependymal cells