AUTOREGULATION-MEDULLARY CONTROL

SUMMARY

1. Nucleus Tractus Solitarius (NTS) is the site of termination of baroreceptor afferent fibers.
2. Excitatory input to sympathetic nerves: from rostral ventrolateral medulla (RVLM) AKA vasomotor area.
3. Fibers descend to the thoraco-lumbar intermedeolateral grey column (thoraco-lumbar outflow/ILM).

CONTROL OF RVLM
4. Arterial baroreceptors, aortic & carotid chemoreceptors, fibers from other parts of nervous system.
5. Descending tracts from limbic cortex that relay in the hypothalamus.
6. Inflation of the lungs causes vasodilatation & decrease in BP via vagal afferents that inhibit vasomotor discharge.
7. Pain causes a rise in BP via reticular formation.



Image: Dr. Appukutty Manickam.

Reference(s)

Barrett, K.E., Barman, S.M., Brooks, H.L., X, J. and Ganong, W.F. (2019). Ganong’s review of medical physiology. 26th ed. New York: Mcgraw-Hill Education