Name ___________________      HW #6      Due:  7/11/05


PNS / ANS ­ Chap 14 & 15


1.  Complete the following statements by inserting your responses in the blanks:

Another name for a long axon is ___________ ___________.  Another name for a bundle of nerve fibers is ______________.  A nerve that contains only afferent fibers is called a _______________ nerve; a nerve that contains only efferent fibers is called a _________ nerve.  Nerves carrying both sensory and motor fibers are called ______________ nerves.


2.  Provide the name and number of the cranial nerves involved in each of the following activities, sensations, or disorders.  Insert your response in the answer blanks.


__________________  a.  shrugging the shoulders

__________________  b.  smelling a flower

__________________  c.  raising the eyelids and focusing the lens of the eye for accommodation; constriction of the eye pupils

__________________  d.  slows the heart; increases the mobility of the digestive tract

__________________  e.  involved in smiling

__________________  f.  involved in chewing food

__________________  g.  listening to music; seasickness

__________________  h.  secretion of saliva; tasting food with the tip of your tongue

__________________  i.  involved in ³rolling² the eyes (3 nerves ­ give only #ıs)

__________________  j.  feeling a toothache

__________________  k.  reading (visualizing the words) a magazine

__________________  l.  purely sensory (3 nerves ­ give only #ıs)


3.  Complete the following statements by inserting your responses in the blanks:  (refer to p. 413-414)

The ventral rami of spinal nerves C1 through T1 and L1 through S4 take part in forming nerve ______________, which primarily serve the __________. The ventral rami of T1 though T12 run between the ribs to supply the ___________________________________________________ ________________________________________.  The posterior rami of the spinal nerves supply the __________________________.


4.  Name the major nerves (or plexus for a and g only) that serve the following body areas.  Insert your responses in the answer blanks. (see chap. 14, p. 414-422)


__________________  a.  head, neck, shoulders (name plexus)

__________________  b.  diaphragm

__________________  c.  posterior thigh (hamstrings)

__________________  e.  leg and foot (name two nerves, which are actually the two nerves that make up answer to ³c²)

__________________  e.  most anterior forearm muscles and intrinsic muscles of lateral palm

__________________  f.  flexor muscles in anterior arm

__________________  g.  part of abdominal wall (name plexus)

__________________  h.  anterior thigh

__________________  i.  skin on medial side of the hand


5.  The following table indicates a number of conditions.  Use a check (3) to show which division of the autonomic nervous system is involved in each condition.





Postganglionic axons secrete norepinephrine (adrenergic)



Postganglionic axons secrete acetylcholine (cholinergic)



Long preganglionic axon; short postganglionic axon



Short preganglionic axon; long postganglionic axon



Arises from cranial and sacral nerves



Arises from spinal nerves T1-L3



Normally in control



Fight-or-flight system



Causes a dry mouth, dilates bronchioles



Constricts eye pupils, decreases heart rate