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Activation of the sympathomedullary pathway

Cerebral Cortex evaluates if it is a

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

Sympathetic Branch stimulates the
adrenal medulla within the adrenal

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 Tense - Body is 'phsyically

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



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