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1、 额 叶 顶叶 Brainstem n“hindbrain nthe oldest part of the brain nsurvival functions A relay station Crossover of axons Heartbeat and Breathing Band of fibers arousal Voluntary movement Subcortical Regions: Limbic System Sensory-motor strips Homunculus: Little man Communication Center Myelinated Axons nM
2、yelin is fatty tissue nFaster conduction Choroid Plexuses Figure 12.22a Embryonic Development of the Spinal Cord nDevelops from caudal portion of neural tube Figure 12.26 Embryonic Development of the Spinal Cord nBy week 6, there are two clusters of neuroblasts: nAlar plate will become interneurons
3、nBasal plate will become motor neurons nNeural crest cells form the dorsal root ganglia Figure 12.26 Cross-Sectional Anatomy of the Spinal Cord nAnterior median fissure separates anterior funiculi nPosterior median sulcus divides posterior funiculi Figure 12.27a Gray Matter and Spinal Roots Figure 1
4、2.27b Gray Matter: Organization nDorsal half sensory roots and ganglia nVentral half motor roots nDorsal and ventral roots fuse laterally to form spinal nerves Figure 12.28 Gray Matter: Organization nFour zones are evident within the gray matter somatic sensory (SS), visceral sensory (VS), visceral
5、motor (VM), and somatic motor (SM) Figure 12.28 White Matter: Pathway Generalizations Figure 12.29 Physical Features Related to Language Speech “puppet master” Syntax & Inflectional Functional Morphology Language comprehension Mental Lexicon Bundle of nerve fibers Communication between B & W ARCUATE FASCICULUS Converts visual stimuli into auditory and vice-versa Carries out Brocas directions Receives visual input and sends it to the Angular Gyrus and Wernickes Area Speaking a Written Word