NEU258_Lecture8_Somatosensory_System_Central notes

NEU258_Lecture8_Somatosensory_System_Central notes -...

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Lecture 8 -... Audio recording started: 11:01 AM Tuesday, October 09, 2012 Midterm - In-class; multiple choice exam (Up to auditory system) [October 23rd, 2012] As the course progresses, the lectures will give information that will not be in the reading - especially on experiments/experimental procedures that need to be followed. Spinal cord, then into somatosensory system - See Diagram 1 - Spinal cord (very similar to Diagram 7 of lecture 7) More medial one (deals with information form legs) = Gracile fascicle More lateral one (deals with information from arms - for the most part) - Cuneate fascicle The information has not crossed over yet, so it still deals with the information regarding the side that it lies on. 2 chunks of fibers in the dorsal part of the spinal cord The axons synapse for the first time in the medulla (this would be the first relay in the medulla) Nucleus in the medulla are called the dorsal column nuclei If you were to cut the medulla it would look something like the spinal cord - See Diagram 3 You would see lots of nuclei (cell bodies) The cell bodies in the upper right of the medulla Cell bodies are secondary neurons The Trigeminal Nuclei is also in the medulla and it deals with the face These fibers travel up and synapse in the medulla - See Diagram 2 The secondary neurons project across the midline (decussation) It is the tract from the medulla to the thalamus - Medial Lemniscal Tract Lower, back, out toward the side - tells you where in the thalamus the connections located The ventral-posterior-lateral nucleus (in the thalamus) The maps of the body (order is conserved in the thalamus (from the medulla) Regions of cells (clumps) are interested in given parts of the body - like Merkel disk, or Meissner corpuscles 3rd neuron travels up the cortex Touch is ventral, posterior and lateral These pain fibers project to many different parts of the brain The main focus of these fibers is definitely the thalamus
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  • Fall '11
  • Graziano

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