You can't feel ulnar pulse because, you can't compress it on a hard anatomical structure like bone. The radial artery can be compressed posterolaterally on the radius bone in the wrist region; therefore the pulse sensation can be experienced though palpation.
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Radial and ulnar. Both arteries are felt on the palmar aspect of the wrist- the radial on the side of the thumb where a physician usually examines the pulse while the ulnar is on the side of the little finger.
The popliteal pulse is felt behind the knee.
That is the Volar Radial Carpal artery, or just Radial artery, for short.
radial
It is stopped because the artery is stopped from pushing the blood forward.