BMS 300 1st Edition Lecture 25 Outline of Last Lecture I. The myotatic reflex arc -reciprocal inhibition 1. inhibition of the antagonistic muscle>branch of the sensory afferent synapses inhibition interneuron 2. inhibition of LMN -reflex arc confined to the spinal cord -severing spinal cord leaves reflex 1. intact but disrupts ascending (sensory) and descending (motor) path 3 II. Delivering somato sensory information to the brain -DCML (dorsicolumn medial meniscus)1. descrimitive touch 2. proproprioception (where our body is in space) III. Anterolateral system -spinothalamic >crude touch, temperature, pain IV. The three neuron chain -1o sensory afferent -2nd order- crosses the midline These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-3rd order- in the thalamus: projects to the sensory cortexV. Following the path -DEML-anterolateral -brown sequard syndrome Outline of Current Lecture VI. Ascending and descending pathways -DCML-anterolateral system1. spinothalamic tract >pain, crude touch, pressure 2. three neuron pathway VII. Brown seguard -spinal cord hemisection >what sensations get through VIII. The post central gyrus and the somato sensory cortex -somotrophy on the somato sensory cortex IX. The pre-central gyrus -the motor cortex >upper motor neurons >corticospinal tract >lower motor neuronsX. Motor unit -the lower motor neuron and the muscle fibers it innervates -functional significance of the motor unit >all or none response of the skeletal muscle cells Current LectureSpinothalamic tract in the anterolateral system -‘spino’: spinal cord, site of the input region -‘thalamic’: thalamus, site of the neuronal output region -spinothalamic tract: carries sensory information about pain, pressure, crude touch, andtemperature to the brain >it’s a bundle of neuronl conductible regions in the CNS -semato sensory cortex: cerebrum, post central gyrus -the cortex always contains 6 layers of neuronal cell bodies in the cerebral cortexBilateral somato sensory pathways to the cerebral cortex (somato sensory cortex) -when you see the word proprioception think dorsal column medial side -how sensory information and the anterolateral (spinothalmic tract) -if we cut the cord down the midline its brown seguard -primary afferent neurons ascend the spinal cord -post sensory gyrus always is sensory (somato sensory
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