Lecture 32 - Reflexes Definition Reflex: a rapid automatic...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Reflexes
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Definition Reflex : a rapid automatic response to a stimulus Reflex arc : the “wiring” of a particular reflex Innate reflex : inborn Learned reflex : reflex acquired through experience
Background image of page 2
Components of a reflex arc Sensory receptor Sensory neuron Integrating center – may or may not include an interneuron Motor neuron Effector
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Classification of reflexes Monosynaptic vs. polysynaptic Somatic vs. visceral Cranial vs. spinal Ipsilateral vs. contralateral
Background image of page 4
Pathways of 4 reflex arcs 1) Stretch reflex 2) Tendon reflex 3) Flexor reflex 4) Crossed extensor reflex b All are somatic and spinal
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Stretch reflex • Purpose is to prevent injury from over- stretching a muscle • Results in contraction of the muscle that was stretched • Stretch sensed by muscle spindle • Monosynaptic, ipsilateral, spinal, somatic reflex
Background image of page 6
Sensory neuron Cell body of sensory neuron Simplest pathway (monosynaptic) Efferent nerve impulse to agonist (stimulation) Interneuron Efferent nerve impulse to antagonist muscle (inhibition) Muscle spindle senses stretch of muscle Response to stimulus Stretch reflex pathway
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/24/2010 for the course PSIO 201 taught by Professor Stanescu during the Spring '08 term at University of Arizona- Tucson.

Page1 / 16

Lecture 32 - Reflexes Definition Reflex: a rapid automatic...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online