Final answer:
The thenar muscles are the collective term for the muscles associated with the pollex, which enable precision in thumb movements.
Step-by-step explanation:
The collective term for the muscles located in the palm but associated with the pollex (also known as the thumb) is the thenar muscles. These include the abductor pollicis brevis, opponens pollicis, flexor pollicis brevis, and the adductor pollicis. They form the thenar eminence, the rounded contour of the base of the thumb, and enable the thumb to perform precise movements necessary for actions such as typing or writing.