BIOD27H3 Chapter 9: Chapter 9 notes
Document Summary
Anatomy of the central nervous system in vertebrate nervous system the cns consists of layers of neural tissue surrounding a fluid filled central cavity which is lined with epithelium. Central cavity becomes central canal of spinal cord: week 11; cerebrum enlarged and most obvious structure at birth. Surround diencephalon midbrain and pons only visible parts below it is cerebellum and medulla oblongata. Lateral geniculate nucleus: white matter; made of myelinated axons contain very few cell bodies. Pale because of myelin sheath: tracts; bundles of axons that connect different regions of cns. Any water soluble molecule that is not transported on one of these carriers cannot cross the blood brain barrier: normal fuel source for neurons is glucose which is why the body closely regulates blood glucose concentrations. Efferent fibers leave spinal cord via the ventral root ascending tracts of white matter carry sensory information to the brain, descending tracts carry efferent signals from the brain.
