Anatomy Bones and Muscles · MU Pleven

135. Third ventricle.

Covers the third ventricle as a fluid-filled cavity of the diencephalon, describing its location between the thalamic halves, its boundaries with the lateral ventricles, cerebral aqueduct and hypothalamic floor, and its four recesses (supra-optic, infundibular, pineal and suprapineal). It then moves to the reticular formation, outlining its neuron network, medullary and pontine afferent and efferent tracts, mesencephalic nuclei, raphe nuclei and their analgesic role, and its functions in consciousness, sleep, autonomic control and motor tone.

Inside: 10 sections · 3 labelled pictures · 10 flashcards · 3 min

Topic 134 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 10 sections, about 478 words (3 min of reading), with 10 flashcards.

In this note

  1. THIRD VENTRICLE
  2. Location:
  3. Boundaries:
  4. Recesses:
  5. RETICULAR FORMATION
  6. Medullary & pontine RF:
  7. Mesencephalic "midbrain" RF:
  8. Raphe nuclei:
  9. Mechanism:
  10. Functions:

THIRD VENTRICLE

  • The third ventricle is one of the fluid-filled cavities within the brain.

* Within the ventricles the are specialized structures which 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.
  • → Laterally - 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 inferior aspect of the tela choroidea

↙ combination of pia mater & ependymal cells

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