Autonomic NS - General Info

Question 1

The ANS generally innervates…

Answer 1

smooth m, cardiac m, glands
control visceral functions necessary for life such as HR, BP, digestion, urination

Question 2

The somatic sensory system transmits sensations of…

Answer 2

touch, pain, temp, position

Question 3

The somatic motor system inn only…

Answer 3

skeletal mm (voluntary and reflexive movement)

Question 4

ANS fibers travel on…

Answer 4

CN and artery pathways

Question 5

ANS is controlled/modulated by fibers originating in…

Answer 5

the CNS

Question 6

ANS motor unit has __ motor neurons while the somatic NS only has __.

Answer 6

ANS – 2 motor units (has pre and post synaptic neurons)
SNS – 1 motor unit (only post synaptic neuron)

Question 7

Presynaptic neurons of the somatic motor system originate…

Answer 7

in the CNS, originating on the brain

Question 8

Sympathetic cell bodies of the ANS lie in…

Answer 8

lateral horn of the spinal cord

Question 9

The presynaptic axon synapses with the postsynaptic neuron in an…

Answer 9

autonomic ganglion (cell bodies of the postsynaptic neuron make up the ganglion)

Question 10

What do autonomic ganglia have that are analogous to interneurons?

Answer 10

small neurons called intrinsic ganglionic cells

Question 11

What are the purpose of intrinsic ganglion cells?

Answer 11

they modulate the activity of the ANS
turn off activity of postsynaptic neuron after it has fired

Question 12

The ANS is split into what 2 systems?

Answer 12

symp and parasymp

Question 13

What CN carry parasympathetics?

Answer 13

III, VII, IX, X

Question 14

What are examples of symp NS stimulation?

Answer 14

pupil dilation, dilation of bronchioles, increased HR, overall vasoconstriction (localized vasodilation in heart and skeletal mm)

Question 15

What are examples of parasymp NS stimulation?

Answer 15

digestion, HR drops, respiration rate drops, bronchioles constrict, pupils constrict

Question 16

What anatomical regions of the CNS do the symp and parasymp systems arise from?

Answer 16

symp – thoracolumbar div (fibers from lateral horn of SC)

parasymp – craniosacral div (fibers from brain and sacral spinal cord)

Question 17

Symp pathways have _______ presynaptic fibers and _______ postsynaptic fibers.

Parasymp pathways have _______ presynaptic fibers and _______ postsynaptic fibers.

Answer 17

symp – short presnaptic, long postsynaptic

parasymp – long presynaptic, short postsynaptic

Question 18

Symp ganglia lie near the ______.

Parasymp ganglia lie near the _______.

Answer 18

symp ganglia – near the SC and vertebral column (short presynaptic)

parasymp ganglia – in or near the effector organ (long presynaptic)

Question 19

True or false – Symp axons branch profusely but your parasympathetics do not.

Answer 19

True (so symp can mobilize a lot of organs at once for fight-or-flight)

Question 20

carry info from sensory receptors of skin & other organs to CNS

Answer 20

afferent

Question 21

carry motor infor away from CNS to the muscles & glands of the body

Answer 21

efferent

Question 22

true/false:
ANS not considered as part of CNS

Answer 22

true

Question 23

ANS is a motor system that acts ____ from the somatic nervous system (SNS)

Answer 23

independent

Question 24

anything you can’t control on your own is controlled by the

Answer 24

ANS

Question 25

general sensory (to viscera)

Answer 25

• stretch
• pain
• temperature & chemical changes
• nausea & hunger

Question 26

innervation of skeletal muscle

Answer 26

somatic motor system (SMS)

Question 27

the space between the end of a nerve cell and another cell

Answer 27

synapse

Question 28

autonomic nervous system carries primarily motor function to the

Answer 28

visceral organs

Question 29

sensory axons travel with autonomic cell bodies of origin to the

Answer 29

dorsal root ganglia of T1 to T6