PHYL 1010X Chapter : Block B - Spinal Cord Reflexes.docx

• School: Dalhousie University
• Department: Physiology
• Course: PHYL 1010X
• Professor: n/a

Document Summary

Neural reflexes: all neural reflexes begin with a stimulus that activates a sensory receptor, receptor send info in the form of action potentials through sensory neurons to the cns, cns evaluates incoming information & selects appropriate response, then initiates action potentials in efferent neurons to direct the response of muscles & glands (the effectors, key feature of many reflex pathways is negative feedback, feedback signals from muscle and joint receptors keep cns informed of changing body position. Innate (inborn) reflexes are genetically determined a: learned (conditioned) reflexes are acquired through experience, the number of neurons in the reflex pathway, monosynaptic reflexes have only 2 neurons, one afferent (sensory) and one efferent, only somatic motor reflexes an be monosynaptic neurons efferent, polysynaptic reflexes include one or more interneurons between the afferent and efferent, all autonomic reflexes are polysynaptic because they have 3 neurons (1 afferent and 2.