Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Blood vessel
Accessory cephalic vein
Superficial veins of the upper limb (accessory cephalic vein labeled at center left)
The accessory cephalic vein is a variable vein that passes along the radial border of the forearm to join the cephalic vein distal/inferior to the elbow. It may arise from a dorsal forearm venous plexus, or from the ulnar/medial side of the dorsal venous network of hand. In some cases the accessory cephalic springs from the cephalic above the wrist and joins it again higher up. A large oblique branch frequently connects the basilic and cephalic veins on the back of the forearm.
Superficial veins of the upper limb (accessory cephalic vein labeled at center left)
This article incorporates text in the public domain from page 662 of the 20th edition of Gray's Anatomy (1918)
