- May 2, 2026The crural diaphragm refers specifically to the lumbar (posterior) portion of the diaphragm formed by the right and left crura,…
- May 2, 2026The pyloric sphincter is a tonically contracted ring of thickened circular smooth muscle at the gastroduodenal junction, palpable as a…
- May 2, 2026The lower esophageal sphincter (LES) is a functional sphincter formed by the intrinsic circular smooth muscle of the distal esophagus…
- May 2, 2026The pyramidalis is a small triangular muscle in the lower anterior abdominal wall, lying in front of the rectus abdominis…
- May 2, 2026The cremaster is a thin layer of skeletal muscle derived from the internal oblique that forms the cremasteric fascia enclosing…
- May 2, 2026The dartos is a smooth muscle layer (not skeletal muscle) in the superficial scrotal fascia, innervated by sympathetic fibres rather…
- May 2, 2026The detrusor is the smooth muscle of the bladder wall responsible for both bladder storage (by relaxing during filling) and…
- May 2, 2026The transversus abdominis is the deepest abdominal muscle with horizontal fibres wrapping around the trunk like a natural weightlifting belt.…
- May 2, 2026The internal oblique has fibres running roughly perpendicular to the external oblique, with most fibres directed upward and medially. Unlike…
- May 2, 2026The external oblique is the largest and most superficial of the flat abdominal muscles, with fibres running downward and medially…