A needle is inserted into the right somatosensory nucleus of the thalamus in the central nervous system and the area is injected with GABA.
A. Define the term ânucleusâ as it relates to the statement above.
B. What is GABA and what effect would GABA have on the membrane potentials of neurons in this area? Explain
C. Describe how/why GABA released from axon terminals in the following neural arrangements would alter impulse transmission:
i) an axoaxonal synapse
ii) an axodendritic synapse
D. If information relayed to this area carries precise touch, what specific somatosensensory pathway would be affected by this injection?
E. Which side of the body would be affected? Why?
F. What fiber type is associated with neurons in this pathway and what does this mean?
G. Through what structure does a primary sensory neuron from the hand enter the central nervous system?
H. Where does the first synapse for this somatosensory pathway occur?
I. Describe the type(s) of sensory information carried by this pathway.
J. Name and describe two different classes of primary sensory receptors that are associated with this pathway.
K. Discuss the common features that all primary sensory receptors possess.
L. If an adrenergic substance had been injected instead of GABA, how would this have altered neural transmission? Explain.
A needle is inserted into the right somatosensory nucleus of the thalamus in the central nervous system and the area is injected with GABA.
A. Define the term ânucleusâ as it relates to the statement above.
B. What is GABA and what effect would GABA have on the membrane potentials of neurons in this area? Explain
C. Describe how/why GABA released from axon terminals in the following neural arrangements would alter impulse transmission:
i) an axoaxonal synapse
ii) an axodendritic synapse
D. If information relayed to this area carries precise touch, what specific somatosensensory pathway would be affected by this injection?
E. Which side of the body would be affected? Why?
F. What fiber type is associated with neurons in this pathway and what does this mean?
G. Through what structure does a primary sensory neuron from the hand enter the central nervous system?
H. Where does the first synapse for this somatosensory pathway occur?
I. Describe the type(s) of sensory information carried by this pathway.
J. Name and describe two different classes of primary sensory receptors that are associated with this pathway.
K. Discuss the common features that all primary sensory receptors possess.
L. If an adrenergic substance had been injected instead of GABA, how would this have altered neural transmission? Explain.
