Anatomy and Cell Biology 3309 Lecture Notes - Lecture 13: Afferent Nerve Fiber, White Matter, Neural Plate

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2% of body mass but consumes 20% of energy of body. From the outside, there are two prominent structures that are seen: cerebrum (cortex, cerebellum. During evolution, they increased in size as humans developed and overgrew other parts of the brain. When a brain is cut open, there are other structures seen: brain stem continues with the spinal cord down the vertebral column. Layer of connective tissue that wraps around the brain. There are three meninges: dura mater, arachnoid, pia mater. Most outer layer: dura mater: on top of the arachnoid, leather-like structure, very hard, tough layer that is connected to the skull, protects the brain, separates cortex from cerebellum and brainstem. Unfixed fresh brain is very soft tissue and it is jelly-like. Csf in the subarachnoid space keeps the brain suspended so its floats. Meninges wrap around the brain but they have nothing to do with the blood brain barrier.

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