Lecture 5 08 - NERVOUS SYSTEM 4 Chapters 13 & 14 Dr. Phelps...

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1 NERVOUS SYSTEM 4 Dr. Phelps Chapters 13 & 14 Lecture 5 I. General brainstem functions & Reticular Activating System II. Cerebellum: Connections and function III. Spinal cord organization IV. Ascending and descending tracts to illustrate neural processing in the CNS V. Organization of the PNS somatic division: receptors and segmental spinal nerves I. Introduction to the brainstem General functions of brainstem: 1. Connects diencephalon to spinal cord 2. Contains neuronal centers critical for survival, e.g. respiratory center 3. Contains 10 out of 12 cranial nerves Reticular Activating System (RAS) - Fig. 13.29 1. Neurons composing the reticular formation dispersed in core of brainstem 2. Neurons of the reticular activating system project diffusely throughout the cerebral cortex, thalamus, and spinal cord. 3. Incoming sensory axons synapse on RAS neurons 4. Function: arousal and consciousness II. Cerebellum: Connections and function Fig. 13.15 A. Originates from metencephalon but forms a cortical structure with gray matter on the outside, white matter on the inside, & deep cerebellar nuclei See 4 th ventricle between the pons and the cerebellum B. Function of cerebellum = to coordinate body movements
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2 C. Cellular structure of a folium - 3 layered cortex: I: Molecular layer II: Purkinje layer III. Granular layer Neurons of cerebellar cortex: 1. Purkinje cells (only neurons that project to the deep cerebellar nuclei) 2. Granule cells form parallel fibers 3. Deep cerebellar nuclei only cells that project out of the cerebellum D. Afferent projections to cerebellar cortex are from:
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This note was uploaded on 02/03/2010 for the course NEUROSCI 101A taught by Professor Scheibell during the Winter '10 term at UCLA.

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Lecture 5 08 - NERVOUS SYSTEM 4 Chapters 13 & 14 Dr. Phelps...

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