sensory and motor elements of periphery Flashcards
What do A alpha motor fibres inervate and what do A alpha sensory do
skeletal muscle
proprioception
types of A alpha sensory fibres and orginination
1a muscle spindles
1b Golgi tendon organs
what do A gamma fibres innervate and originate
muscle spindles
dorsal root
name the sensory neurones
A beta
A delta
C fibres
C sympathetic
name the mechanoreceptors
messier corpuscle
merkel cell
pacinian corpuscle
ruffini ending
A beta fibres
touch and pressure
use mechanoreceptors
A delta fibres
nociceptors
fast pain and temp
C fibres
slow pain and temp
fibres and noiceptors
C sympathetic
post ganglionic sympathetic fibres
impulses from autonomic ganglia to organs
messier corpuscle
light touch
merkel cell
texture and object shape
pacinian corpuscle
vibration
Ruffini ending
tension in skin
what is sensory transduction
conversion of a physical stimulus into a string of action potentials that can be interpreted by the sensory cortex
describe sensory transduction
stimulus applied deformation of tissue altered permabilitu of receptor membrane depolarisation receptor potential graded action potential
what does deformation of the tissue of pacinian corpuscle lead to
sodium influx and receptor potential
local circuit of current flow
how does the pacinian corpuscle feed to the SC
dorsal root ganglion
what is the pacinian corpuscle q
series of connective tissue lamella that responds to change rather than constant
which receptors are slowly adapting
merkel
ruffini
which receptor is fast adapting
pacinian corpucle
what does the CNS determine from merkle or Ruffini receptors
strength and duration of stimulus
what do nociceptors respond to
intense stimuli that may be damaging
which receptors respond to temperatire
transient receptor potentials
which axons will have lower thresholds?
larger ones e.g. A alpha
describe neuromuscular transmission
AP leads to calcium influx vesicles fuse with presynaptic membrenae Ach diffuses across cleft activates Act receptor sodium influx musclce contraction
