Somatosensory Neurones And Receptors Notes
This is a sample of our (approximately) 4 page long Somatosensory Neurones And Receptors notes, which we sell as part of the Neurology Notes collection, a 70-80% package written at Bristol University in 2012 that contains (approximately) 117 pages of notes across 36 different documents.
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Lecture 10 Somatosensory neurones and receptors
General o Somatosensroy NS includes all sensory (or afferent) neural info excluding special senses e.g. from skin, muscle and viscera (organs) o System receives info
From outside world (sensors beneath skin)= EXTEROreceptors
About posture/movement (sensors in muscles/tendons)=PROPRIOreceptors
About internal environment/organs (sensors in viscera/tissues)=
INTEROreceptors o Afferent: proceeding towards a centre (in this case periphery to CNS) o Special senses: Vision, olfaction, hearing, vestibial senses Sensory Modalities o Heat, Cold, Stretch, Acid, Sting, Itch, Press, Stroke, Tickle, Ache o Thermal; Mechanical; Chemical o Labelled line concept - separate pathways for the transmission of information relating to different modalities. Generally accepted for skin/muscle afferents. Primary afferent neurons o Pseudo-unipolar
Detect sensory stimuli & send message towards the CNS- therefore a type of peripheral neurone (their cell body lies outside the CNS)
With cell bodies in the
DORSAL ROOT GANGLIA
• Between each vertebra
• Peripheral fibres running with segmental nerves (muscle and skin afferents) or with autonomic nerves (visceral afferent fibres)
CRNIAL NERVE ROOT GANGLIA
• Cranial nerve outflow (e.g. swelling on Vth nerve= trigeminal ganglion from head region, or on vagus Xth cranial nerve from visceral afferents)
• Fibres running with autonomic nerves Are there specific pathways related to specific sensory modalities?
o Separate pathways for transmission of information relating to different modalities (sensations) from sensory receptor cortex o Concept accepted for most types of somatic (skin & muscle) afferents, but discussion continues about visceral afferents o
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