Levator Ani Muscle – Origin, Insertion & Function – Human Anatomy | Kenhub

Levator Ani Muscle – Origin, Insertion & Function – Human Anatomy | Kenhub

Hey, everyone. It’s Matt from Kenhub. And
in this tutorial, we will discuss the origin, insertion, innervation, and function of the
levator ani. The levator ani forms the main part of the
pelvic diaphragm, a layer of the pelvic floor known as the cranial layer. The levator ani
is made up of three muscles. The puborectalis muscle originates lateral
from the symphysis on both sides and encircles the rectum, which causes a ventral bend between
the rectum and anal canal. It is partly interwoven with the external anal sphincter. The pubococcygeus muscle runs from the pubic
bone to the tendinous center of the perineum, anal coccygeal body, and coccyx. In men, medial muscle fibers are partly connected
to the prostate. The iliococcygeus muscle, also known as the coccygeus muscle, extends
more laterally from the fascia of obturator internus muscles to the coccyx. As a whole, the levator ani builds a V-shaped
structure. Both levator arms limit a triangle opening which is divided by prerectal fibers
into the urogenital hiatus and anal hiatus. The urogenital hiatus is the pathway for the
urethra, and in women, the vagina. The rectum runs through the anal hiatus. This muscle group is primarily supplied by
direct branches of the sacral plexus. To a small degree, the pudendal nerve contributes
to its innervation as well. Through its tonic activity, the levator ani
stabilizes the abdominal and pelvic organs on the one hand and controls the opening and
closing of the levator hiatus on the other hand. While in quiescent state, the urethra and
the rectum are mechanically closed at the levator hiatus. The muscle relaxes at the
beginning of urination and defecation. By this means, the levator ani muscle plays
a crucial role in the preservation of urinary and bowel continence. This video is more fun than reading a textbook,
right? If you want more videos, interactive quizzes,
articles, and an atlas of human anatomy, click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks
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17 thoughts on “Levator Ani Muscle – Origin, Insertion & Function – Human Anatomy | Kenhub

  1. Thank you so much for this! I was searching for Levator Ani videos yesterday just before this was uploaded. Huge help, thanks again!

  2. I am a medical student. very good illustrations and concise explanation. this saved me a lot of reading time. Thanks a lot and cheers from saudi arabia!

  3. The iliococcygeus muscle is NOT the same as the coccygeus muscle. The coccygeus muscle is also known as the ischiococcygeus muscle and runs from the ischial spine to the coccyx. This part of the video is pretty misleading…

  4. Since my IUD perforated me and I had to have it yanked out, I have had chronic sharp spasms in all of these muscles. It's crippling. When I try to explain this pain to doctors they just shrug and say sometimes pelvic pain Is inexplicable.

  5. Thank you so much for this great video. But I think there is a mistake; iliococcygeous muscle and coccygeous are not the same. As much as I know, iliococcygeous muscle is part of levator ani muscle and is quite different from coccygeous muscle which is a separate muscle which accompanying levator ani muscle make pelvic diaphragm.

  6. Very very informative information. I am wondering are these the layer of muscles that a woman feels when she is doing kegel/pelvic floor exercises? Is that what creates the tightness and gripping friction feeling especially during sex?

  7. And also what creates that spreading out feeling of the muscle or vagina? Or at least when I feel that it makes me feel like I have to do a kegel, because that spreading out sensation makes things feel looser and weird than how I felt before

  8. Hi everyone! Hope we were able to shed some light on the levator ani muscle and help you pick the right anatomy learning method for you. Tell us what's your favorite way of learning Human anatomy. Also, don't forget to check out our fun video tutorials and interactive quizzes: https://khub.me/9q3zb Have fun learning!


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