What defines a plexus?

A plexus is defined as a network of interlacing nerves or blood vessels. This is significant because the structure of a plexus allows for a complex organization of nerves that can coordinate and integrate signals within specific regions of the body. For instance, the brachial plexus is a major network of nerves that supplies movement and sensation to the shoulder, arm, and hand. Similarly, vascular plexuses ensure that blood supply is efficiently distributed within organs, providing oxygen and nutrients where needed.

The concept of a plexus is essential for understanding how nerve signals are transmitted throughout the body and how blood vessels work together to supply tissues. This complex interrelationship enhances the body's ability to maintain homeostasis and respond to various stimuli effectively. Thus, recognizing the defining characteristic of a plexus as a network rather than a single structure or type of tissue is crucial for comprehending human anatomy and physiology.