noun
plexus
PLEK-sus/plˈɛksʌs/
A network of interconnected parts, especially nerves or blood vessels.
The diagram shows a branching nerve plexus from neck to arm.

Etymology
From plectere, “to braid,” plexus carries the image of strands interlaced into a network. In anatomy, those strands are nerves, vessels, or fibers rather than material woven into a braid.
In context
the brachial plexus is a network of five spinal nerves (C5 to T1). It is in charge of supplying sensory and motor innervation to the upper limb.
More examples
- The surgeon identified the nearby vascular plexus.
- Several branches joined in a dense plexus.
- The drawing traced connections within the plexus.
Forms
plexus · plexuses