If you are palpating the anterior surface of the lateral side of the distal forearm, what pulse are you checking?

There is no clinically named 'humeral' pulse; the major named vessel of the upper arm is the brachial artery, assessed at the antecubital fossa.

The ulnar pulse is found on the medial (little finger/ulnar) side of the distal forearm, which is the opposite side from the lateral location described.

The brachial pulse is assessed at the antecubital fossa on the medial aspect of the elbow, not at the distal forearm.

The radial artery travels distally along the lateral border of the forearm and becomes easily palpable on the anterior surface near the radial styloid process at the wrist. This site - the anterior, lateral, distal forearm - is the standard clinical location for checking the radial pulse, the most commonly assessed peripheral pulse.