BPK 142 Lecture Notes - Lecture 14: Central Nervous System, Spinal Cord Injury, Efferent Nerve Fiber

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Brain: newer more sophisticated regions are piled on top of older, more primitive regions. Cerebrum constitutes about 80% of total brain weight - cerebral cortex, basal nuclei. Brainstem: continuous with the spinal cord: medulla, pons, midbrain. Spinal cord: long cylinder of nerve tissue which extends down from the brainstem to the second lumbar vertebrae. 45 cm long and 2 cm in diameter. Protected by the vertebral column and associated ligaments and muscles, the spinal meninges and the cerebrospinal fluid. Two regions for innervation of the limbs: The cervical enlargement: extends from the c4 through t1 segments of the spinal cord. The lumbosacral enlargement; extends from the t11 through. Plexus: a network of converging and diverging nerve fibers/blood vessels. The brain and spinal cord are composed of gray (the nerve cell bodies lie in and constitute)/white matter (interconnecting tracts of nerve fibers (axons))

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