action force definition, action force meaning | English dictionary. action. 7 the operating mechanism, esp. in a piano, gun, watch, etc. n (Physics) the supposed interaction of two separated bodies without any intervening medium.
The myometrium is the middle layer of the uterine wall, consisting mainly of uterine smooth muscle cells (also called uterine myocytes), but also of supporting stromal and vascular tissue. Its main function is to induce uterine contractions.
Smooth muscle in the wall of the gut derivatives is derived form the splanchnic layer of lateral plate mesoderm that surrounds these structures. Only the sphincter and dilator muscles of the pupil and muscle tissue in mammary and sweat glands are derived from ectoderm.mooth Muscle [ edit | edit source]. Smooth muscle for the dorsal aorta and large arteries is derived from lateral plate mesoderm and neural crest cells. In the coronary arteries smooth uscle originates from proepicardial cells and neural crest cells.