APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -At a cellular level, smooth muscle functions as an involuntary non-striated muscle. Smooth muscle contains thick and thin filaments that do not arrange into sarcomeres, resulting in a non-striated pattern. On microscopic examination, it appears homogenous.

Detailed explanation-2: -Smooth muscle, found in the walls of the hollow internal organs such as blood vessels, the gastrointestinal tract, bladder, and uterus, is under control of the autonomic nervous system. Smooth muscle cannot be controlled consciously and thus acts involuntarily.

Detailed explanation-3: -Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.

Detailed explanation-4: -Cardiac muscles are the involuntary muscles that are striated. These muscles are found on the wall of the heart and contract and relax at regular intervals. Individual heart muscle cells are known as cardiomyocytes. Cardiomyocytes are joined together by intercalated discs forming cardiac muscles.

Detailed explanation-5: -Non-striated muscles are smooth and devoid of striations. Found in the hollows of internal organs such as the stomach, intestines, and urine bladder, among other places. They are also known as involuntary muscles because their activation is not under the control of the human.