Question

question 4
1 pts
spinal cord tracts provide conduction paths to and from the brain. the tracts that conduct
sensory impulses down the cord from the brain are called ____ tracts.
ascending
descending
lateral spinothalamic
spinocerebellar

question 5
1 pts
if you trace the axon inside the sympathetic chain ganglion, the preganglionic fiber branches
along which pathway?
synapses with a sympathetic postganglionic neuron
sends ascending or descending branches through the sympathetic trunk to synapse with
postganglionic neurons in other chain ganglia
passes through one or more ganglia without synapsing
all of the above

question 6
1 pts
the two efferent divisions of the autonomic nervous system are the
somatic and sensory divisions.
sympathetic and somatic divisions.
sympathetic and parasympathetic divisions.
peripheral and central divisions.

Explanation:

Question 4

• Ascending tracts carry sensory information to the brain.
• Descending tracts carry motor or sensory (in some cases like certain pain - modulation signals) information from the brain down the spinal cord.
• Lateral spinothalamic tract is an ascending tract that carries pain and temperature sensations.
• Spinocerebellar tracts are ascending tracts that carry proprioceptive information to the cerebellum.

• Preganglionic fibers in the sympathetic chain ganglion can:
• Synapse with a sympathetic postganglionic neuron at the same level.
• Send ascending or descending branches through the sympathetic trunk to synapse with postganglionic neurons in other chain ganglia (for a wider distribution of the sympathetic response).
• Pass through one or more ganglia without synapsing (to reach collateral ganglia for innervation of abdominal and pelvic organs).

• The somatic nervous system is not part of the autonomic nervous system.
• The autonomic nervous system has two efferent (motor - like in terms of innervating organs) divisions:
• Sympathetic division: involved in the "fight - or - flight" response.
• Parasympathetic division: involved in the "rest - and - digest" response.
• Peripheral and central are broader classifications (nervous system as a whole is divided into central and peripheral, but not specific to the autonomic efferent divisions).

Answer:

descending

Question 5