Final answer:
Primate hands have opposable thumbs and tactile pads, which, along with five digits and flat nails, provide enhanced sensory detection of touch. These features evolved to improve climbing and gripping in an arboreal environment.
Step-by-step explanation:
The aspect of the primate hand that gives primates good sensory detection of touch is primarily due to the opposable thumbs and the presence of tactile pads on the fingers and toes. Primates have five digits on each hand and foot, with flat nails instead of claws, enhancing their ability to sense and manipulate objects. Additionally, primates have mechanoreceptors in their fingertips and palms, specialized for detecting fine details and textures, contributing to their sensitive touch. The evolution of these features is closely tied to the arboreal theory, suggesting that these traits developed as adaptations for life in the trees, allowing for more effective gripping and climbing.