Ventricles

Picture
LATERAL VENTRICLE
  • Divided into 3 parts (thinnest sites in wall): 
    • Body
      • Loc: b/w body of the fornix and the thalamus
      • Opening: velum interpositum and third ventricle
    • Atrial 
      • Loc: atrium of the lateral ventricle b/w crus of the fornix and pulvinar
      • Open: posterior ambient cistern, quadrigeminal cistern, pineal region
    • Temporal horn
      • Loc: b/w the fimbria of the fornix and the lower surface of the thalamus
      • Opening: ambient and crural cisterns
  • Choroidal fissure
    • Fx: site of attachment of the choroid plexus in the lateral ventricle
    • Loc: b/w fornix and thalamus in the medial part of the lateral ventricle
FORAMEN OF MONROE
THIRD VENTRICLE
SYLVIAN AQUEDUCT
FOURTH VENTRICLE
1. Substantia ferruginea 
2. Facial colliculus
3. Striae medullares*
4. Vestibular area
5. Hypoglossal triangle
6. Vagal triangle 
7. Calamus scriptorius 
Inferior: Obex
Stria medullaris: fibers originating from the arcuate nucleus in the medulla which are situated in front of the medullary pyramids. They receive contralateral projections from the cortex/corticospinal tract and send efferents through 2 paths (external) and internal arcuatocerebellar (aka stria medullares) thru the inferior cerebella peduncle.  
QUIZ