A wall anatomy poster dedicated to the sympathetic nervous system is an indispensable educational resource, providing a clear, detailed visualisation of this critical component of the autonomic nervous system. Known as the "fight or flight" system, the sympathetic nervous system is responsible for preparing the body to respond rapidly to stressful situations. The poster meticulously illustrates the anatomical origins of the sympathetic system. It clearly maps out the sympathetic chain of anatomy from eyes, organs to the reproductive system. These visual elements provide viewers with an intuitive understanding of how the sympathetic network is distributed and how it communicates with multiple organ systems.

Physiological effects of sympathetic activation on the body

Beyond anatomical accuracy, the poster effectively conveys the physiological effects of sympathetic activation on the body. It demonstrates how, in response to a perceived threat, the sympathetic nervous system triggers a cascade of reactions designed to optimise the body for immediate action. One of the most prominent effects is the increase in heart rate and the force of cardiac contractions, a response that ensures rapid delivery of oxygenated blood to muscles and vital organs. The poster also illustrates the dilation of bronchioles in the lungs, enhancing oxygen intake, as well as the dilation of pupils, which improves vision under low light conditions. In the digestive system, sympathetic activation suppresses gastrointestinal activity, diverting energy away from non-essential processes to focus on survival.

Additionally, the poster uses clear, labelled illustrations highlighting how the vagus nerve, the longest cranial nerve, is a major player in the parasympathetic system. It wanders ( “vagus” means “wandering” in Latin) from the brainstem all the way to the gut, helping regulate everything from heartbeat to digestion. This section of the poster effectively bridges the gap between the nervous and endocrine systems, showcasing how the body’s reaction to stress is both rapid (through nerve impulses) and sustained (through hormonal release). Such a representation helps learners appreciate the interconnected nature of physiological responses during emergencies.