Unit 3 Review Questions - Unit 3 Review Questions Structure...

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Unit 3 Review Questions Structure and Organization of the CNS 1. Regions of the Brain and embryonic origins a. Forebrain (prosencephalon) a.i. Divides into a.i.1. endbrain (telencephalon) aka cerebral hemisphere a.i.2. Diencephalon=> develops into the eyes b. Midbrain (mesencephalon) c. Hindbrain (rhombencephalon) c.i. Divides into: c.i.1. Pons and cerebellum (anterior portion) c.i.2. Medulla oblongata (caudal portion) d. Forebrain becomes the largest portion of the brain 2. Homunculus is a representation of the human body in relation to the sensory cortex. The more nerve endings in a body part, the bigger the body part appears on the homunculus. Generated by Wilder Penfield when he stimulated sections of the brain. 3. The brain is not necessary for generating spinal reflexes. The reason being the primary sensory fibers from the reflex channel enter the spinal cord make synaptic connections directly with motor neurons and indirect connections through interneurons in the spinal cord whose axons synapse upon motor neurons. 4. Three Channels of the Sensory Nerve System a. Reflex channel – direct connection to motor neurons b. Cerebellar Channel - balance c. Lemniscal Channel – conveys sensory information which will enter into conscious experience via thalamus 5. Cerebral cortex has four lobes (frontal, occipital, temporal, parietal). Frontal and parietal lobes are separated by the central sulcus. The precentral gyrus is the motor cortex and the postcentral gyrus is the sensory cortex. The sylvian fissure separates the frontal and parietal lobe from the temporal lobe. The auditory cortex is located on a small strip of the most dorsal part of the temporal lobe, close to the Sylvian fissure. a. 6 Layers of the Cortex a.i. Nothing really a.ii. Signals sent to other cortical areas a.iii. Cortex of the opposite side a.iv. Sensory fibers from the thalamus (thickets in the sensory cortex) signals from the thalamus terminate here a.v. Cortico-spinal tract (in the motor cortex, it is the thickest layer) a.vi. To thalamus and other deep structures in the brain 6. They divided the cortex into 47 areas based on difference in the relative development of the cortical layers. Each division is recognizable on the basis of slight differences in the neuronal architecture of the region a. Important Areas: a.i. 17 – primary visual cortex a.ii. 1, 2, 3 – primary somatosensory cortex a.iii. 4 – motor cortex
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7. Golgi Stain- able to stain an entire neuron, but only can stain a few cells at a time a. Nissl Stain – stains areas where there are RNA, which is associated with rough ER and with the nucleolus, which are present in the cell body and NOT THE AXONS OF DENDRITES. Stains the cell body of every neuron in the brain. 8.
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This note was uploaded on 09/14/2009 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas at Austin.

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Unit 3 Review Questions - Unit 3 Review Questions Structure...

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