PSL300H1 Lecture Notes - Lecture 15: Posterior Grey Column, Tendon Reflex, Withdrawal Reflex

65 views4 pages
10 Nov 2011
School
Department
Course

Document Summary

Psy300h1f l15; oct. 17, 2011: need efferents to stop out hair cells from amplifying, otherwise getting ringing in ears. Signal sent by afferents to dorsal horn in spinal cord or sensory nuc in brainstem (involving cranial nerves) Then directed to motor nuc to specifc muscles to get motor response in periphery of body. Stretch reflex: stimulus: passive stretch of a muscle by applied load or contraction of antagonist muscle, most important reflex, often unaware of; ex. Stretch reflex function: essential for stabilizing posture; reflex strongest in postural muscles; constantly detecting stretches and making adjustments to keep posture upright; ex. If doze off makes you stand up: latencies (delays) of about 25 ms for forearm muscles, Triceps stretched slight upward movement stretch on opposite side, activate muscle spindles, volley in 1a afferents stretch reflex causes small contraction in stretched muscle. 1b afferents in overcontracted muscle cause inhibition so loosen up to stabilize position.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents

Related Questions