Anatomical Basis of Hydrocephalus Flashcards
Everything rostral to the foramen of Monro in the lateral ventricle is considered…
This is considered to be in which lobe of the brain?
Anterior (frontal) horn
frontal lobe
What is everything caudal to the foramen of monro but rostral to the atrium is considered what?
body of lateral ventricle
Everything caudal to the atrium of the lateral ventricle is considered the … and is in the … lobe of the brain
posterior (occipital) horn
occipital lobe
How are the lateral ventricles connected?
there is no direct connection between the two lateral ventricles
only continuity is via the Foramen of Monro (interventricular foramen) which opens into the midline third ventricle
What part of the lateral ventricle is smaller than the superior portion and does not extend as far rostrally?
inferior (temporal) horn
What is the most rostral midline ventricle?
third ventricle
Inferiorly, the third ventricle expands into what area?
hypothalamic region
What are the rostral and caudal borders (partially) of the third ventricle?
rostrally - anterior commissure
caudally - posterior commissure
As the third ventricle narrows dramatically in a caudal direction to become the Cerebral Aqueduct, where will the aqueduct course?
between the tectum and tegmentum of the midbrain and a portion of teh pons
The lateral walls of the third ventricle abut what structure?
medial surfaces of paired thalamuses
What is the central merging of two thalamuses called?
massa intermedia or thalamic adhesion
What structures does the midline fourth ventricle separate?
the caudal portion of the pons and rostral portion of the medulla from the ventral surface of the cerebellum
When the cerebral aqueduct dilates, this area becomes the fourth ventricle; it reaches maximum size at what point? What is this area called?
near the caudal end of the pons
fastigium
Where does the fourth ventricle terminate?
in the rostral portion of the medulla as the triangular Obex
What forms the lateral and superior borders of the fourth ventricle?
cerebellar peduncles
The caudal tip of the Obex is continuous with what structure?
central canal of the spinal cord
Just rostral to the obex, the roof of the fourth centricle is perforated forming what? Where does this lead?
Median Aperature (Foramen of Magendie)
leading into subarachnoid space
On the caudal end of the fastigium, the lateral wall of the fourth ventricle evaginates to form what? Where does this lead to?
Lateral Aperatures (Foramen of Luschka)
leading to subarachnoid space
What are the three major components that allow the functionality of the BBB?
- coupled, nonfenestrated endothelial cells (tight junctions)
- continuous basement membrane (with pericytes)
- astrocytes with their tube feet on the outside of the basement membrane
What is the primary site for secretion and chemical modification of CSF?
choroid plexus
Where is the choroid plexus?
mostly in lateral ventricles
some in dorsal 3v
some in fastigium of 4v