Chapter 14 (1)
Card Set Information
Chapter 14 (1)
Lecture test number one.
What are the three divisions of the ANS?
Enteric Nervous System
Where do the axons of the Sympathetic division emerge?
Thoracic and superior lumbar segments of the spinal cord.
Describe the location of ganglia inervation of the sympathetic division of the ANS.
Relatively close to the spinal cord.
Where do the axons of the Parasympathetic division emerge?
The brain stem and sacral spinal segments.
Describe the location of ganglia innervation of the Parasympathetic division of the ANS.
Innervate ganglia very close (or within) target organs.
Describe the Enteric Nervous System.
Extensive network of neurons and nerve networks within walls of the digestive tract. It is influenced by both the sympathetic and parasympathetic divisions.
Describe the length of both pre and post ganglionic fibers.
Preganglionic fibers are relatively short and postganglionic fibers are relatively long.
What are the three sympathetic divisions?
What is the function of the sympathetic division?
It prepares the body for a hightened levels of somatic activity.
What are the typical responses of the sympathetic division?
Heightened mental alertness
Increased metabolic rate
Reduced digestive and urinary functions
Activation of energy reserves
Incresed respiratory rate and blood pressure
Activation of swear glands
What are the two ganglia of the parasympathetic division?
Describe the function of the parasympathetic division.
It is concerned with regulation of visceral function and energy conservation.
What are the typical responses of the parasympathetic division?
Decreased metabolic rate
Decreased heart rate and blood pressure
Increased salivary and digestive gland secretion
Increased digestive tract motility and blood flow
Stimulation of urination and defication
What are splanchnic nerves?
Preganglionic fibers passing to collateral ganglia.
Whar are sympathetic nerves?
Postganglionic fibers innervating thoracic cavity structures which form bundles.
The Vagus nerve provides roughly 75% of inpulses of what division of the ANS?
Numerous vagus nerve branches intermingle with sympathetic fibers forming what?
_____ fibers in sacral spinal cord segments form distinct pelvic nerves.