Abnormal muscle fiber morphology Angulated muscle fibers 2021-10-19T16:38:38Z Angular muscle fibers Normal muscle fibers are polygonal-shaped in cross section, are multinucleated, and have minimal amounts of endomysial connective tissue. In contrast, angulated (also known as angular) muscle fibers have long and narrow vertices (corners) with sharp edges and a pointed tip. Angular muscle fibres Muscle fibers showing neurogenic atrophy are compressed by neighboring non-atrophic fibers and may show an angulated appearance on a transverse section. See Figure 3A in PMID:32529201.