Brain剖课件.ppt

The Human Brain The Central Nervous System Brainstem “hindbrain the oldest part of the brain survival functions Myelinated Axons Myelin is fatty tissue Faster conduction Choroid Plexuses Embryonic Development of the Spinal Cord Develops from caudal portion of neural tube Embryonic Development of the Spinal Cord By week 6, there are two clusters of neuroblasts: Alar plate – will become interneurons Basal plate – will become motor neurons Neural crest cells form the dorsal root ganglia Cross-Sectional Anatomy of the Spinal Cord Anterior median fissure – separates anterior funiculi Posterior median sulcus – divides posterior funiculi Gray Matter and Spinal Roots Gray Matter: Organization Dorsal half – sensory roots and ganglia Ventral half – motor roots Dorsal and ventral roots fuse laterally to form spinal nerves Gray Matter: Organization Four zones are evident within the gray matter – somatic sensory (SS), visceral sensory (VS), visceral motor (VM), and somatic motor (SM) White Matter: Pathway Generalizations Physical Features Related to Language Speaking a Written Word * * 额 叶 顶叶 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 Figure 12.22a Figure 12.26 Figure 12.26 Figure 12.27a Figure 12.27b Figure 12.28 Figure 12.28 Figure 12.29 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 Broca’s directions Receives visual input and sends it to the Angular Gyrus and Wernicke’s Area