Chapter 18 Part 1 Flashcards
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)
