438
UNIT 3
Regulation and Integration of the Body
12
Cor
ona
radiata
Longitudinal f
issure
Gray
mat
ter
Gray
mat
ter
Whit
e mat
ter
Association fibers
(within hemispher
e)
Lat
eral
ventricle
Third
ventricle
Thalamus
Pons
Medulla ob
longata
Decussation
(cross-over)
of pyramids
Commissural fibers
(between hemispher
es)
Projection fibers
(cer
ebral cor
tex
to
lower ar
ea)
Cor
pus callosum
• Int
er
nal
capsule
Superior
Basal nuclei
• C
audate
Pu
tame
n
• Globus
pallidus
(a) Frontal section
Association fibers
Cor
pus callosum
Projection fibers
Commissural fibers
(b) Parasagittal section and dissection
• Int
er
nal capsul
e
Cor
ona radiat
a
Figure 12.8
White fiber tracts of the cerebral hemispheres.
Commissural, association,
and projection fibers run within the cerebrum, and between the cerebrum and lower CNS
centers. In all views, notice the tight band of projection fibers, called the internal capsule, that
passes between the thalamus and the basal nuclei, and then fans out as the corona radiata.
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