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Activation of the sympathomedullary pathway

Cerebral Cortex evaluates if it is a
stressor



Hypothalamus triggers activity in the
sympathetic branch of ANS (Branch of
the peripheral nervous system)


Sympathetic Branch becomes more
active when body is stressed & using
energy


Sympathetic Branch stimulates the
adrenal medulla within the adrenal
glands…

Page 2

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Activation of the sympathomedullary pathway


Blood Pressure & Heart Rate
Increase - Get blood to areas of
body needed for acitvity




Digestion Decreases - Blood can
be directed to the brain and
muscles




Muscles Tense - Body is 'phsyically
'responsive




Perspiration Increaases - Body can
cool down and burn more…

Page 3

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Followed by the activation of the pituitary-adrenal system
If the stress is long-term (several hours or more) ­ The sympathomedullary system starts to
use up the body's resources ­ A second system produced a countershock response to supply
the body with more fuel




Hypothalamus triggers the
release of CRH



CRH…

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