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Smooth muscle
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Smooth (soft) muscle is an involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations. It is divided into two subgroups, single-unit and multiunit smooth muscle. Within single-unit muscle, the whole bundle or sheet of smooth muscle cells contracts as a syncytium.
Smooth muscle shown in the tunica media in the walls of arteries and veins
Smooth muscle shown in the tunica media in the walls of arteries and veins
The dense bodies and intermediate filaments are networked through the sarcoplasm, which cause the muscle fiber to contract.
The dense bodies and intermediate filaments are networked through the sarcoplasm, which cause the muscle fiber to contract.
A series of axon-like swellings, called varicosities from autonomic neurons, loosely form motor units through the smooth muscle.
A series of axon-like swellings, called varicosities from autonomic neurons, loosely form motor units through the smooth muscle.
Striated muscle tissue
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Striated muscle tissue is a muscle tissue that features repeating functional units called sarcomeres. The presence of sarcomeres manifests as a series of bands visible along the muscle fibers, which is responsible for the striated appearance observed in microscopic images of this tissue. There are two types of striated muscle:Cardiac muscle Skeletal muscle
Micrograph of HPS stained skeletal striated muscle (fibularis longus).
Micrograph of HPS stained skeletal striated muscle (fibularis longus).