02 15 08 - Organization of the brain II

02 15 08 - Organization of the brain II - Organization...

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02/15/08 – Organization, support, and protection of the brain Chapter 13: A summary of the functions of major brain regions. Note: your text is intentionally brief, and I will be even more abbreviated in the presentation of the material from pp.350-358. You are encouraged to read this information to provide a little more background and cohesiveness to the material, but we will not be covering it in any depth. white matter on outside of the brain axons traveling the spinal chord gray matter, central core of the brain that is surrounded by white matter and in some places there is an additional layer of grey matter that surrounds the white matter outside the lower the brain region the more essential it is to life I. The Cerebellum 1. Adjusts the postural muscles of the body a. & Unconscious somatic movements i. These are rapid , automatic adjustments that maintain balacnce and equilibrium 2. Fine tuning conscious and unconscious motor movements – patterned movements a. Important for pattern movements because it allows you not to have to think about the same repetitive movement i. Refines learned movement patterns 1. Done indirectly by regulating activity motor pathways along cerebral cortex, basal nuclei b. Vermis-separates the cerebellar hemispheres c. Flocculonodular lobe- lies between the roof of the 4 th ventricle and the cerebellar hemispheres and the vermis d. Purkinje cells i. Huge, highly branched ii. Extentsive dendrites, each cell receives input from up to 200,000 synapses iii. Arbor vitae- white matter inside, resembling a tree 1. Cerebrellar nuclei- info relayed from the Purkinije cell II. The Brainstem: Medulla Oblongata A. Relays information to the thalamus(mostly through the white matter): 1. to higher brain regions from (somatic) sensory receptors 2. communication between the brain and the spinal cord involves tracts that ascend or descend through here 3. to autonomic processing centers (from viscera) a. visceral receptor bring info to autonomic reflex centers B. Autonomic processing centers – “Reflex centers” 1. Cardiac centers a. Regulates the heart beat 2. Vasomotor centers a. Contraction of blood vessel, Arteries 3. Respiratory centers a. Changes the diameter of the respiratory passages - Blobs in picture slide autonomic processing centers III. The Brainstem: Pons
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A. Relays sensory info to cerebellum and thalamus a. B. Has subconscious somatic and visceral motor centers a. Connects the cerebellum to the brain stem b. Contains nuclei involved with somatic and visceral motor control IV. The Midbrain (mesencephalon) A. Corpora quadrigemina- (body ) 1. Superior colliculi – receives visual information a. Info from retina received here, visual input received , visual input received , visual input received from the lateral geniculate nucleaus pf the tahalamus on that side b. Control the reflex movements of the eyes, head and neck in response to visual stimuli 2. Inferior colliculi – receives auditory information
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02 15 08 - Organization of the brain II - Organization...

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