the brain - improved

7/26/2019 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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the brain - improved

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