Anatomy (CNS) · MU Sofia

157. Fourth ventricle.

Covers the fourth ventricle as a fluid-filled cavity in the hindbrain between the brainstem and cerebellum, including its extent from the cerebral aqueduct to the central canal and its diamond-shaped cross-section. It then goes through the roof, with its tela choroidea and medullary vela, the floor or rhomboid fossa divided by sulci and striae, and the lateral walls formed by cerebellar peduncles. It also describes the recesses, the obex and the choroid plexus with its arterial supply, with four pictures illustrating the boundaries.

Inside: 4 sections · 4 labelled pictures · 10 flashcards · 2 min

Topic 15 of 34 in the MU Sofia syllabus for Anatomy (CNS) (Medicine, Year 2). The free AceMed note covers it in 4 sections, about 289 words (2 min of reading), with 10 flashcards.

In this note

  1. FOURTH VENTRICLE
  2. Boundaries:
  3. Recesses:
  4. Choroid Plexus:

FOURTH VENTRICLE

  • The fourth ventricle is a fluid-filled cavity located in the hindbrain, between the brainstem and the cerebellum.
  • It is one of the four ventricles in the brain and plays a crucial role in the circulation & drainage of cerebrospinal fluid (CSF).
  • It extends from the cerebral aqueduct superiorly, to the central canal and spinal cord inferiorly.
  • It is lined by an epithelial layer called the ependyma.

Shape: Diamond-shaped when viewed in cross-section. tent-shaped when seen from the side.

Boundaries:

  1. 1 - Roof (Dorsall wall):
  • ↳ Composed of a thin layer of tissue known as the tela choroidea, wich is continuous with the roof of the 3rd ventricle.
  • ↳ Formed by superior medullary velum and inferior medullary velum.
  • ↳ band of ependyma stretched btw. the 2 sup. cerebellar puduncles.
  • Floor (Ventral wall)
  • ↳ Also referred to as the rhomboid fossa.

It is visible into a right and left half by the posterior median sulcus, and into a superior & inferior triangle by the striae medullares.

  • Superolateral boundary - formed by the SCP.
  • Inferolateral " - " " ICP + gracile & cunate tubrecles
  • Lateral walls:
  • ↳ Formed by the cerebellar peduncles

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