Transcription of Ascending Sensory Pathways
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Ascending Sensory Pathways
A variety of Sensory receptorsscattered throughout the bodycan become activated by exteroceptive, interoceptive, or proprioceptive input. Exteroceptive input relays sensoryinformation about the body s interaction with the externalenvironment. Interoceptive input relays information aboutthe body s internal state, whereas proprioceptive input con-veys information about position sense from the body and its component parts. Each receptor is specialized to detectmechanical, chemical, nociceptive (L. nocere, to injure, painful ), or thermal stimuli. Activation of a Sensory recep-tor is converted into nerve impulses and this Sensory input isthen conveyed via the fibers of the cranial or spinal nerves totheir respective relay nuclei in the central nervous system(CNS).
Nonencapsulated mechanoreceptors Nonencapsulated mechanoreceptors are slowly adapting and include free nerve endings and tactile receptors Free nerve endings(Fig. 10.1) are present in the epidermis, dermis, cornea, dental pulp, mucous membranes of …
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