BIOL 1334 Lecture Notes - Lecture 18: Cerebro, Dura Mater, Hydrocephalus
13 Sep 2016
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Nervous system: dorsal, hollow, ectodermal in origin. Brain: development begins ~ 3-4 wks of intrauterine life. Telencephalon- largest secondary vesicle, give rise to cerebral hemispheres. Diencephalon- gives rise to thalamus(-pineal), epithalamus, and hypothalamus. Grey matter- neuronal cell bodies (nissl granules)+un-myelinated fibers. White matter- no cell bodies+ myelinated fibers. Neuronal cell bodies: brain, spinal cord, ganglia. Tracts: bundles of axons in spinal cord. Communicate with third ventricle through interventricular foramen or foramen monro. Lined by ependymal cells; filled with csf. Cerebrospinal fluid: 150 ml constant throughout body; like blood plasma, no rbcs. Circulates in ventricles in brain and central canal of spinal cord >get out > circulate around brain+spinal cord >in subarachnoid space. Secreted by blood capillaries >choroid plexus > in lateral ventricle, third ventricle, and fourth ventricle. Reabsorbed into blood through arachnoid villi found in sagittal sinus. Adult life: compression in brain, vision problems. Epidural space: potential spaces during hemorrhaging > epidural hematoma.
