perimysium

This term is a specialized anatomical descriptor used primarily in histology and kinesiology. It describes the intermediate layer of connective tissue, positioning it between the endomysium (which wraps individual fibers) and the epimysium (which wraps the entire muscle).

As a technical medical term, it is used almost exclusively in formal scientific contexts, such as textbooks or clinical reports. It is not used in casual conversation or general descriptions of muscle soreness or fitness.