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Chapter 13

BIOL 1334 Chapter Notes - Chapter 13: Septum Pellucidum, Median Aperture, Dura Mater

Course Code
BIOL 1334
Tehjedra Gill

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Chapter 13: Nervous System Brain and Cranial Nerves * embryonic development * neural
plate, neural folds, and neural tube * rostral portion forms brain * caudal portion forms spinal
* primary brain vesicles:
- prosencephalon
- mesencephalon
- rhombencephalon
* secondary brain vesicles
- telencephalon and diencephalon in forebrain
- midbrain remains undivided
- metencephalon and myelencephalon in hindbrain
* major brain flexures
- midbrain and cervical flexures
- due to growth within a limited space in cranium
- bend the forebrain towards the brain stem
Ventricles of the brain
* extensions of the embryonic neural canal
* continuous with each other and the central canal of spinal cord
* filled with CSF
* lined with ependymal cells
** Lateral ventricles (I and II ventricles)
- large C-shaped chambers
- each deep inside each cerebral hemisphere
septum pellucidum:
* a thin membrane
* separates the two lateral ventricles anteriorly
- communicate with the narrow III ventricle in diencephalon - through a small opening
** III ventricle continuous with the IV ventricle - through a canal
** IV ventricle in pons and medulla
- continuous with central canal
- two lateral apertures and a median aperture
- connect IV ventricle to the subarachnoid space: a fluid-filled space surrounding the
Protection of brain: Meninges
** Dura mater
** Arachnoid
** Piamater
* Meningitis: inflammation of meninges (bacterial or viral), such as encephalitis
Cerebrospinal Fluid (CSF)
Blood-Brain barrier:
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