Massage & Bodywork Licensing Examination (MBLEx)

Spindle cells are primarily found in the belly of a muscle. These cells are specialized muscle fibers involved in proprioception, which is the body's ability to sense its position and movement. They play a vital role in informing the central nervous system about muscle stretch, contributing to the coordination of muscle activity. While spindle-shaped cells can be associated with other areas of the body, such as in the nervous system or in certain connective tissues, their notable presence in muscle belly regions emphasizes their integral function in muscular performance and reflex mechanisms. This makes understanding their location significant in fields related to anatomy, physiology, and bodywork. The other options do not reflect the typical locations where spindle cells are significantly involved.