Chapter 45.3 - Chapter 45.3 I. Mechanical Forces a....

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Chapter 45.3 I. Mechanical Forces a. Mechanoreceptors i. Physical distortion of membrane = open ion channels, change membrane potential = AP b. Touch and pressure c. Merkel’s discs i. Hairy/nonhairy skin ii. Change slowly iii. Continuous info about what’s touching skin d. Meissner’s corpuscles i. Nonhairy skin ii. Sensitive iii. Change quickly iv. Info about what’s touching skin e. Ruffini endings (deeper) i. Change slowly ii. Vibrating stimuli (low v) f. Pacinian Corpuscles (deeper) i. Change rapidly ii. Vibrating stimuli (high v) g. Dendrites wrap around hair follicles h. Muscles and joints i. Send info to CNS 1. Posture and coordinated movements II. Mechanoreceptors a. Skeletal muscle - Muscle spindles i. Stretch receptors ii. Whenever muscle stretches, muscle spindles do too 1. Sends info (APs) to CNS 2. Change strength of contraction as needed b. Tendons and Ligaments i. Golgi tendon organ 1. Info about force from muscle contration 2. Contraction too high = inhibit spinal cord motor neurons to
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This note was uploaded on 01/27/2011 for the course BIOSC 0150 taught by Professor Lydiadaniels during the Fall '08 term at Pittsburgh.

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Chapter 45.3 - Chapter 45.3 I. Mechanical Forces a....

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