Lecture 2 Flashcards
What nerves innervabl to body?
Spinal
What nerves innovate the face and thought
Cranial
What is a demotore
Area of skin innovated by Nev ones eating at the some and of the spinal chord
What is the relative diameter and conduction velocity of A beta A delta and c serve fibers?
AB is fastest and widest
Adelta is second wideestand fastest
C are smallest and slowest
Which sensory nerve fibers are myelinated ?
A beta and A delta
What is the relative threshold of action pother Hals for the A beta A delta and C fibres.
A beta is low )a delta and C are both high
What sensation does A beta fibres transport
Touch
What sensation do A delta fibres transmit ?
Pain and temperature
What sensation do C fibres transmit?
Pain temperature and itch
What are the superficial skin receptors?
Merklesdisk, free nerve ending ) messiness corpuscle
What one the deep skin receptors
Hair follicle recptor pacinion corpuscle and ruffians ending
What skin sense raptors are enervated by A beta fibers?
Merkels disk
Messiness corpuscle
Pacinian corpuscle
Ruffians ending
What skin receptors are innovated by a delta/C fibers
Free nerve ending and hair folic al receptor
What receptor responds to sideways shear force ?
Messiers corpuste
What ceptors are stimulated by skin deformation(light)
Merkel
What replorsare sense to deep dermal pressure?
Pa cinian corpuste
What raptor is stimulate by skin stretching via tension in collagen
Ruffini
What size is the receptive field for MeiSS her and merkile receptors?
Small both small
What is the size of the receptive field for the Pacin ion and Ruffini receptors?
Large for both
What does the frequency of firing related to in slow adapting mechanoceptors?
The frequency of ap firing ng is related to the depth of the touch
What does the frequency of firing related to in fast adapting mechanoceptors?
The frequency of firing is related to the speed of the touch.
How long do ap keep firing after the indentation in fast adapting mechanocpters?
Fast adapting nedhanocopters only fire ap at the start of on indentation
How long do ap s fire for show adapting fibres after indentation?
For the whole time the stimulus is present
What transducer molecule are used in the messier and Merkel receptors? What rough sensation do they both transducer?
Both use piezo 2 and respond to light touch
What’s the machismo of action for opening piezo 2
The triskelion structure is in the membrane plane, when the membrane deforms then the cap regain deforms and the poor opens
Give an example one of each experimental method,ex vivo culture and benaviral experiments that conform peizo 2 me ho a p fur is a
In diseased nerve only 50% of AB fibres t of peico two responded light touch, behavoral asslyony 20% of peízo 2 h0 with G draw paw when touched
What chemosensor is on adeltand C fibres
Trp channels
