APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The shape of smooth muscle is fusiform, which is round in the center and tapering at each end. Smooth muscle can tense and relax but has greater elastic properties than striated muscle. This quality is important in organ systems like the urinary bladder, where the preservation of contractile tone is a necessity.

Detailed explanation-2: -At a cellular level, smooth muscle can be described as an involuntary, non-striated muscle. Smooth muscle consists of thick and thin filaments that are not arranged into sarcomeres giving it a non-striated pattern.

Detailed explanation-3: -The detrusor smooth muscle is the main muscle component of the urinary bladder wall. Its ability to contract over a large length interval and to relax determines the bladder function during filling and micturition.

Detailed explanation-4: -Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control. 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-5: -Smooth muscle is found in the walls of hollow organs, including the stomach, intestines, bladder and uterus.