Autonomic Nervous system

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Human Anatomy
Chapter 17
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1

Vasoconstriction and bronchodilation result from stimulation by the ________ division.

sympathetic

2

Autonomic fibers emerging from the craniosacral region of the spinal cord belong to the
________ division.

parasympathetic

3

Postganglionic fibers of the parasympathetic system are called ________ because they release
the neurotransmitter acetylcholine.

cholinergic

4

The ________ nervous system consists of complete three-neuron reflex arcs that exist entirely
within the wall of the digestive tube.

enteric

5

During development, all neurons with cell bodies in the PNS derive from the ________.

neural crest

6

The cell bodies of postganglionic parasympathetic fibers to the pupil and lens of the eye are
located in the ________ ganglion.

ciliary

7

The ________ plexus is a network through which branches of the vagus pass to the intestines
and liver.

celiac

8

Autonomic fibers to the pelvic organs pass through the pelvic plexus, also known as the
________ plexus.

inferior hypogastric

9

Visceral reflexes that do not involve the CNS but instead synapse in sympathetic ganglia are
called ________ reflex arcs.

peripheral

10

Sympathetic preganglionic fibers leaving the thoracic spinal nerves may ascend within the
________ before synapsing so that they can exit near the head.

sympathetic trunk

11

Gray rami communicantes contain ________ sympathetic fibers that travel to peripheral
structures.

postganglionic

12

The sensation of pain from a visceral organ that is perceived in the skin or outer body is the
phenomenon called ________.

referred pain

13

The primary integrating center of the ANS is the ________ of the diencephalon.

hypothalamus

14

The adrenal medulla is comprised of modified sympathetic ________ neurons which secretes
epinephrine and norepinephrine.

adrenergic or post-ganglionic

15

Congenital megacolon, or Hirschsprung's disease, is a birth defect in which the ________
innervation of the distal region of the large intestine fails to develop normally.

parasympathetic