Section 17 Flashcards
What is the Autonomic nervous system?
A motor system that controls glands, cardiac muscles, and smooth muscles.
What does the somatic motor system control?
Skeletal muscles
What are the primary target organs of the ANS?
Cutaneous blood vessels
blood vessels
sweat glands
Arrector muscles
What type of action does the autonomic nervous system carry out?
Involuntary
Without intent or awareness
What are the steps in the Reflex arc?
Receptors
Afferent neurons
Integrating Center
Efferent neurons
Effectors
How many subsystems does the ANS have?
Two
Sympathetic
Parasympathetic
What is the function of the Parasympathetic tone?
Maintains smooth muscle tone in the intestines and holds resting heart rate down to about 70-80 beats/ min
What is the function of the Sympathetic tone?
It keeps the blood vessels partially constricted and maintains blood pressure
Are the Autonomic preganglionic fibers myelinated or unmyelinated?
Myelinated
Are the Autonomic postganglionic fibers myelinated or unmyelinated?
Unmyelinated.
All nerve fibers of the sympathetic division arise from the thoracic and lumbar regions of the spinal cord. Their name is?
Thoracolumbar division
What is the length of the preganglionic fibers in the sympathetic division?
They have short preganglionic nerve fibers
What are the three major collateral ganglia in the Abdominal aortic plexus?
Celiac, superior mesenteric and inferior mesenteric ganglia
What are the two parts of the adrenal glands?
The adrenal cortex
The adrenal medulla
Where is the adrenal cortex located and what is its function?
It is located on the outer rind and its function is to secret steroids hormones
