Biology 12

Chapter 5 The Nervous System • MHR 145

matter made up of axons. The corpus callosum
transfers impulses from one hemisphere to the other.
Figure 5.10 shows that the cerebrum is also
divided into four lobes, each associated with
different functions. The frontal lobeis involved in
the control of muscles (motor areas) and the
integration of information from other parts of the
brain to help us reason. This area allows us to
think critically and plan our actions. The parietal
lobereceives sensory information from the skin
and skeletal muscles, and is associated with our
sense of taste. The occipital lobereceives
information from our eyes, and the temporal lobe
receives information from our ears.
In the next section, you will examine more
closely the structure and function of the neurons in
your body, as well as the high-speed communication

network of which they are a part. You will see how

chemical substances stimulate neurons to trigger

the impulses that enable you to think, move, and

respond to stimuli. In the final section of this

chapter, you will study sensory receptors

associated with sight, hearing, and touch.

http://www.mcgrawhill.ca/links/biology12

Memory is an important cognitive function. What do you do to

help remember important information for your next class test?

To access procedures for memory tests, go to the web site

above, and click on Web Links.

WEB LINK

Frontal

lobe

Temporal

lobe

Occipital

lobe

Parietal

lobe

primary

visual area

visual

association

area

auditory association area

primary auditory area

primary

somatosensory

area

primary taste area

sensory speech (Wernicke’s) area

somatosensory

association area

primary motor area

premotor area

prefrontal

area

motor speech

(Broca’s) area

Figure 5.10The cortex of the cerebrum is divided into four lobes: frontal, parietal,
temporal, and occipital. The frontal lobe has motor areas and an association area called
the prefrontal area. The other lobes have sensory areas and also association areas.