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(Last Updated On: March 2, 2019)

Semimembranosus Muscle : Origin, Insertion, Action, Innervation

Origin: Upper outer quadrant of the posterior surface of the ischial tuberosity, deep to the conjoined tendon of the semitendinosus and the long head of the biceps femoris.
Insertion: The posterior aspect of the medial condyle of tibia, below the joint line, sending fibers into the fascia over popliteal ligament.
Actions: Extension of the thigh at the hip, flexion of the leg at the knee, internal rotation of the knee when knee is flexed
Innervation: Tibial portion of the sciatic nerve  (L5, S1, S2)
Blood Supply: Branches from the internal iliac, popliteal, and profunda femoris artery

Semimembranosus origin, insertion, action, innervation.

Semimembranosus Muscle Actions With Agonists and Antagonists

Primary Actions of the Semimembranosus

1. Extension of the thigh at the hip

  Agonists:

  • Gluteus maximus
  • Semitendinosus
  • Biceps femoris (long head)
  • Adductor magnus (posterior part)

  Antagonists:

  • Psoas major
  • Iliacus

2. Flexion of the leg at the knee

  Agonists:

  • Biceps femoris
  • Semitendinosus

  Antagonists:

  • Vastus Lateralis
  • Vastus Medialis
  • Vastus Intermedius
  • Rectus Femoris

3. Internal rotation of the leg at the knee

  Agonists: 

  • Semitendinosus
  • Popliteus

  Antagonists:

  • Biceps femoris

Information about cause and effect of Semimembranosus pain:

Semimembranosus Muscle Buttock, Thigh and Knee Pain

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Recommended Anatomy Books:

Anatomy Coloring Book

The Anatomy Coloring Book is one of the best study and reference books for beginning anatomy students. The diagrams are clearly labeled and allow you to see the relationship and placement of the various structures of the body. You will also be surprised how the act of coloring will help with recall. But this is not just a beginners book, it is also great for practitioners and therapists to have on hand to use with clients and patients to use as a visual reference.

Human Muscle Anatomy

The Trail Guide To The Body is another excellent book to help you learn the musculature of the human body. Though the book is geared toward massage therapists and physical therapist assistants, the book with its illustrations and text helps anyone gain a thorough understanding of the human musculoskeletal system and movement. I highly recommend this book for anyone studying anatomy and believe that MTs, PTAs, and teachers of body movements should have this book in their possession. I also highly recommend this book for the lay person who wants to gain understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!

Basic Clinical Massage Therapy

Out of the scores of books in my office Basic Clinical Massage Therapy is by far the most referenced book in my library. The musculoskeletal system is overlaid on human models allowing you to learn the precise location, origin and insertions of each muscle. The models are pictured in various poses throughout the book which also helps you visualize muscles in motion and their actions relationship with the skeletal structure and other muscles. Though it is written for massage therapists, it is an excellent book for anyone who wants to learn about the muscular system. MT's will benefit from recommended treatments for each muscle.

Muscle Anatomy Flashcards

Musculoskeletal Anatomy Flashcards Are you a student or professional therapist who needs to brush up on the musculoskeletal system? Dr. Joseph E. Muscolino DC has developed a comprehensive set of flashcards that will help develop a mind's picture of exactly where the muscles lie under the skin. A highly recommended study aid for students. Great for non students who want an easy comprehensive anatomy guide.

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