L2 - Laura Montgomery - Somatic sense 0.0 / 5 ? PharmacySomatic sensesUniversityNone Created by: RscottqubCreated on: 31-03-19 22:57 2 divisions of the peripheral NS 1. sensory division 2. motor division 1 of 33 sensory division includes somatic senses and special sense 2 of 33 motor division includes somatic NS (skeletal muscle movts) ANS - smooth and cardiac muscle 3 of 33 Receptor any structure specialized to detect a stimuli 4 of 33 cluster free nerve endings detect pain,heat and cold. can be myelinated or unmyelinated 5 of 33 Meissners corpuscle unmeylinated nerve ending , for touch 6 of 33 Pacinian corpuscle unmyelinated sensory neurone, layers of tissue - pressure receptor 7 of 33 Merkel disc merkel cell + enlarged myelinated axon terminal - 8 of 33 Ruffinis corpuscle bundle of collagen fibres - with myelinated sensory axon. Branching between fibrils 9 of 33 Signal transduction process of turning stimulus ---> AP 10 of 33 Receptor potential The Membrane potential change when a receptor responds to a stimuli 11 of 33 Labelled line principle type of sensation felt is dictated by the point where the nerve fibres lead to 12 of 33 Somatic sense 1+2 Touch and pressure - often grouped together because pressure= sustained touch 13 of 33 Stimuli for touch and pressure mechanical deformation 14 of 33 Light touch Merkel disc, Meissners corpuscle 15 of 33 Heavy touch paccinian and ruffinis corpuscle 16 of 33 Somatic sense 3 temperature 17 of 33 3 types of temperature receptor warm, cold, pain 18 of 33 warm receptors stimulated >30 19 of 33 cold stim <45 20 of 33 warm pain stim >45 21 of 33 cold pain stim <15 22 of 33 perception of temp depends on proportions of each receptor stimulated 23 of 33 Somatic sense 4 pain 24 of 33 how was the somatosensory cortex mapped out experiment on conscious patient, areas of cortex probed with needle- caused various regions of body to have pins and needles 25 of 33 the more sensitive a limb the greater area of cortex allocated to it 26 of 33 somatic senses in the head travel to the cortec via what nerve trigeminal nerve 27 of 33 somatic senses below the head travel to the cortec via what nerve spinothalamic tract 28 of 33 where does the spinothalmic tract cross the spinal cord 29 of 33 Dorsal collun is for what type of touch fine touch and propriception. 30 of 33 where does DC cross after leaving dorsal collumn nuclei to reach the thalamus 31 of 33 Gracile fasciculus T6 and below (chest downwards) 32 of 33 Cuneate fasciculus T6 and above (chest and above and arms) 33 of 33
Comments
No comments have yet been made