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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 5 - Muscular Tissue

Plate 5.71: Striated Muscle

Cremaster muscle myofibrils

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed

Cremaster muscle myofibrils

Plate 5.71: Striated Muscle

Human, 10% formalin, H. & E., 1416 x.

A capillary containing a red blood cell is seen between muscle fibers. Muscle fibers are provided with a rich capillary network that supplies essential nutrients and oxygen and removes metabolic wastes.

Myofibrils: Subunits of each muscle fiber. Each myofibril is composed of myofilaments. Myofibrils vary in size, depending upon the number of myofilaments they contain. Myofilaments cannot be resolved by the light microscope.

Nucleus with nucleolus: The nucleus shown in this mature muscle fiber is characteristically located near the sarcolemma. In some skeletal muscles, particularly those that are slow contracting (Type I, Type B, or red), the nuclei may be found more centrally located within the muscle fiber.

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