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Ventricles & CSF cisterns. Ventricles. CSF filled spaces in the brain related to development of the nervous system as a tubular structure with central canal Lined with ependyma Plexuses of highly vascular pia mater form choroid plexuses which produce CSF. Lateral Ventricles.

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ventricles
Ventricles
  • CSF filled spaces in the brain related to development of the nervous system as a tubular structure with central canal
  • Lined with ependyma
  • Plexuses of highly vascular pia mater form choroid plexuses which produce CSF
lateral ventricles
Lateral Ventricles
  • C-shaped facing anteriorly
  • Occupy each cerebral hemisphere
  • Communicates with 3rd ventricle at junction of anterior horn and body – interventricular foramen (of Monro)
lateral ventricles1
Lateral Ventricles
  • Anterior horn – within frontal lobe
    • Anterior: genu corpus callosum
    • Roof: body corpus callosum
    • Medial: septum pellucidum
    • Floor/lateral wall: head of caudate nucleus
  • Body – within parietal lobe
    • Roof: body corpus callosum
    • Medial: septum pellucidum
    • Lateral wall: body of caudate nucleus
    • Floor: thalamus (medially)
lateral ventricles2
Lateral Ventricles
  • Temporal (inferior) horn
    • Roof: tail of caudate nucleus
    • Floor: hippocampus
    • Lateral: tapetum (fibres of corpus callosum)
    • Anterior: amygdaloid nucleus
  • Occipital horn (posterior)
    • Extends from posterior convexity of the “C” – trigone
    • Lateral: tapetum & optic radiation
    • Medial: white matter indented by grey matter of calcarine sulcus (calcar avis)
choroid plexus
Choroid plexus
  • Composed of invaginated highly vascular pia called tela choroidea
  • Extends from inferior horn, body into intraventricular foramen and continuous in 3rd ventricle. 4th ventricle also contains a chorioid plexus.
  • Blood supply
    • Anterior choroidal (br internal carotid) enters anterior part of temporal horn
    • Posterior choroidal (br PCA) enters body of lateral ventricle above the thalamus
  • Venous drainage
    • Choroidal v in inferior horn, passing anteriorly to intraventricular foramen, joins with thalamostriate v to form internal cerebral v
third ventricle
Third ventricle
  • Slit like space between the thalami
  • Thin anterior wall (lamina terminalis) from anterior commissure superiorly to optic chiasm inferiorly
  • Inferiorly extension into optic chiasm (supraoptic recess) and infundibulum (infundibular recess)
  • Posterior extension into pineal stalk (pineal recess) and suprapineal recess above this
third ventricle1
Third ventricle
  • Anterior: anterior commissure
  • Roof: anterior commissure, intraventricular foramen, body of the fornix
  • Floor: structures of hypothalamus incl. pituitary
  • Lateral: thalami
  • Thalami are connected across the ventricle in 60% of people by a non-neural connection – massa intermedia
cerebral aqueduct
Cerebral Aqueduct
  • Narrow channel passing through brainstem connects posterior end of 3rd ventricle and superior end of 4th ventricle
  • 1.5cm length, 1-2mm diameter
  • Anterior: cerebral peduncles & tegmentum
  • Posterior: tectum
  • Nuclei of CN III, IV, V surround aqueduct
fourth ventricle
Fourth ventricle
  • Extends as a widening of the aqeduct posterior to the pons to the obex (caudal tip of the fourth ventricle; a marker for the level of the foramen magnum of the skull)
  • Floor: rhomboid fossa (pons and upper part of medulla)
  • Roof: cerebellum (superior and inferior medullary vela)
  • Lateral: cerebellar peduncles
  • Communicates with the subarachnoid space through
    • Median aperture (foramen of Magendie) in the inferior medullary vellum open into the cerebellomedullary cistern (cisterna magna)
    • two lateral foramina of Luschka in the lateral recesses open anteriorly into the pontine cistern
cisterns
Cisterns
  • Collections of deep CSF spaces around the brain
  • Cerebellomedullary cystern
    • posterior to medulla and inferior to cerebellar hemispheres
    • Receives CSF from 4th ventricle via median aperture
    • Continues as spinal subarachnoid space through foramen magnum
    • Contents: vertebral a and posterior inferior cerebellar branch
  • Pontine cistern
    • Between pons and clivus
    • Cerebellomedullary cystern above, Interpenduncular cistern below
    • Contents: basilar artery and assoc branches
  • Interpenduncular cistern