ANS intro to parasympathetics Flashcards
what is another word for visceral motor
autonomic
what are the target tissues of autonomic innervation
smooth muscle, cardiac muscle, and glands
how many neurons are involved in the autonomic nerve pathway
2, preganglionic and postganglionic
what are exceptions of visceral innervation? (usually in organs but in body walls)
- sweat glands
- arrector pili muscles
- smooth muscle in skin and vessel walls
what are the 3 types of visceral motor innervation
- sympathetic innervation
- parasympathetic innervation
- enteric innervation
what controls the balance between sympathetic and parasympathetic input
the brain
what innervation is in visceral structures of the body wall (w exceptions)
sympathetic only w the exception of arteries to external genitalia which receive both
what are the anatomical differences between sympathetic nerves and parasympathetic nerves
- location of preganglionic cell bodies
- lengths of preganglionic and postganglionic axons
- size and location of ganglia
where are preganglionic cell bodies located in parasympathetic nerves
craniosacral outflow regions (brain or S2-S4)
where are preganglionic cell bodies in sympathetic nerves located
thoracocolumbar outflow regions (T1-L2)
where are ganglia located in sympathetic nerve pathways
halfway between the CNS and target
where are ganglia located in parasympathetic nerve pathways
at the target
what does the vagus nerve supply and in what regions
supplies parasympathetics to cervical mucosa (larynx and pharynx), all of the thoracic organs, and organs of the upper abdomen
what does the pelvic splanchnic nerve supply and where
parasympathetic to the lower abdomen and pelvis (S2-S4_
where do the pelvic splanchnic nerves come out of
ventral rami
