The structure indicated is the cephalic vein.
and basilic veins
are the main superficial veins
of the upper limb. The cephalic vein originates from the dorsal venous network
of the hand and drains into the axillary vein
by passing through the deltoid and pectoralis major muscles.
In the cubital fossa, which is the area located anterior to the elbow joint, the cephalic vein is joined to the basilic vein via the median cubital vein
In the clinical setting, the median cubital vein is a convenient and common location for obtaining venous access for the administration of fluids or intravenous medication.
Learn more about the veins of the body
in this tutorial.