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.

 

Condition

Sympathetic

Parasympathetic

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