Electrical Events During Neuronal Signaling (Stimulus è Graded
Potential è Action Potential è Synaptic Transmission)
GatedChannel
(chemical,
thermal,
mechanical)
© Kristie Lester 2014
Exercise #4: Question 1: Part (ii):
1. To the brain (sensory) – lateral spinothalamic pathway:
Stimulus
GP
EPSP
AP
(temperature)
First Order
EPSP
AP
Second Order
(PNS to spinal cord)
AP
POSTCENTRAL
GYRUS
Third Order
(in spinal cord)
(in brain)
2. From the brain:
a) Corticospinal tract (somatic nervous system)
GP
EPSP/IPSP
AP
Upper Motor Neuron
(in cerebral cortex)
AP
Lower Motor Neuron
SKELETAL MUSCLE
(in PNS – spinal or cranial nerve)
b) Sympathetic (autonomic nervous system)
GP
EPSP
AP
Preganglionic
(spinal cord to PNS)
© Kristie Lester 2012
ACh*
AP
Postganglionic
SWEAT GLANDS
(in PNS)
*usually sympathetic postganglionic neurons
secrete norepinephrine as the nt (Fig. 14.2)