External anal sphincter
Flat plane of skeletal muscle fibers
External anal sphincter
The external anal sphincter (or sphincter ani externus) is an oval tube of skeletal muscle fibers. Distally, it is adherent to the skin surrounding the margin of the anus. It exhibits a resting state of tonic contraction and also contracts during the bulbospongiosus reflex.
Read on Wikipedia · Image Waterced, CC BY-SA 4.0
Open boosters, collect cards and trade them. Free to play.
Play for free