What role does the myometrium play in the uterus?

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Front view anatomical diagrams of the male and female reproductive systems, with labeled organs including penis, testis, prostate gland, uterus, ovary, and vagina. — human reproductive system Organs and structures of the male and female reproductive systems.

The myometrium is the middle layer of the uterine wall and serves as the primary muscular component of the uterus. It constitutes the bulk of the organ's mass and is composed of densely packed, unstriped smooth muscle fibers.1

These muscle fibers are organized into three distinct layers that run in various directions, which provides the structural strength necessary for the uterus to function. In addition to muscle tissue, the myometrium contains blood vessels, lymph vessels, and nerves.1