Touch and pressure receptors include free ends of sensory nerve fibers, Meissner's corpuscles, and Pacinian corpuscles.

fingertips, palms, soles, nipples, and external genital organs. They sense motion of objects that barely contact the skin, interpreting impulses from them as the sensation of light touch. They are also used when a person touches something to judge its texture (fig. 12.2a).

3. Pacinian corpuscles. These sensory bodies are relatively large, ellipsoidal structures composed of connective tissue fibers and cells. They are common in the deeper subcutaneous tissues of the hands, feet, penis, clitoris, urethra, and breasts and also in tendons of muscles and ligaments of joints (fig. 12.2b). Heavy pressure stimulates Pacinian corpuscles. They may also detect vibrations in tissues.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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