The Brain - Improved
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MidsagittalView of the Human Brain
http://www.driesen.com/glossary_s-t.htmhttp://www.driesen.com/glossary_s-t.htm -
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S ti S C t
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Somatic Sensory Cortex
A) This shows the
approximate region of the
cortex concerned with sensory
activities in different parts of
the body.B) This shows the
somatotropic representation of
body parts from medial to
lateral along the plane.C) This shows the drawing
of the humunculus
constructed on the basis ofsuch mapping.
Note that the amount of
somatic sensory cortex
devoted to the hands
face lips and mouth is
much larger than the
relative amount of bodysurface in these
regions. !ensitivity in
these areas is extremely
important for human
functioning.
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A new understanding of sensory brain organization has led to a more complex model whereby
interconnections between cortical, subcortical, and brainstem structures occur in actiities as
suggested by the !ew Model below"
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"ou will notice the
small dots on the
illustration. The
larger the number
of dots and the
closer they are to
each otherindicates how
heavily any
particular area is
affected by tangles
and amyloid
pla#ues. "ou may
note that the areas
of heaviest
involvement arethose areas
involved in
memory. $se the
lin%s below to find
more about these
areas.
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#se the illustration in the preious illustration to label this model of the brain"
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$he illustration aboe displays what factors affect axonal regeneration after damage
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$he area of s%in
innerated by a
single spinal dorsal
root is %nown as a
dermatome"
&ermatomal maps,
such as the one
below, are an
importantdiagnostic tool for
locating the site of
in'ury to the spinal
cord and dorsal
roots"
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The neurons of the paraventricular nucleus &'() of the hypothalamus secrete a peptide called corticotropin*releasing factor &C+) which
stimulates the anterior pituitary gland to secret adrenocorticotropic hormone &ACT,). ACT, enters the general circulation and stimulates theadrenal cortex to secrete glucocorticoids).
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