Chapter 18 Part 1 Flashcards Preview

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Flashcards in Chapter 18 Part 1 Deck (13):

Involuntary controls glands, smooth and Cardiac muscle -2 motor neurons extending from CNS to effector -excitatory or inhibitory

Ans (automatic)


Preganglionic neuron from CNS synapses with postganglionic neuron in automatic ganglion

Ans motor neurons 1


Postganglionic neuron extends from automatic ganglion to effector

Ans motor neuron 2


Sympathetic "fight "or "flight"and parasympathetic "rest" and "digest"

Ans divisions


____ have dual innervation; supplied by both divisions s and p have opposite effects

Most Organs


Formed by sympathetic preganglionic neurons that originate at spinal cord levels t1-l2 widespread effect; short preganglionic neurons synapse with many long postganglionic neurons in ganglia all effectors except the adrenal gland are controlled by postganglionic neurons

Sympathetic division or thorocolumnar division


Consists of two types of ganglia sympathetic trunk (chain) preverteble ganglia

Sympathetic division


Located on both sides of vertebral column- consists of white rami; entry point to the trunk formed by preganglionic sympathetic neurons at t1-l2 cord levels grey rami; exit points for trunks found in all 31 spinal nerves outnumber white rami

Sympathetic trunk (chain)


Anterior to vertebral column near abdominal arteries

Prevertable ganglia


Formed by parasympathetic preganglionic neurons that originated not brain stems as cranial nerves III, VII,IX,X and spinal cords levels s2-s4

Parasympathetic division or cranial sacral division


Carries 80% of outflow

Vagus nerve x


Long preganglionic neurons with a few short postganglionic neurons in terminal ganglia located close to or within effector

Localized effect (parasympathetic division)


Voluntary controls skeletal muscles - consists of two motor neurons -extending from CNS to effector -always excitatory

Sns( somatic)