Vastus Intermedius


Vastus Intermedius is the deepest of the quadriceps muscles

Muscle Group: Vastus Intermedius is the deepest of the Quadriceps

Action: Straightens the knee (extension)

Origin: Anterior and lateral surfaces of the femoral shaft and lower part of the lateral intermuscular septum

Insertion: Attaches to the deep surface of the other quadriceps tendon, the base of the patella, suprapatellar bursa and the tibia via the patella tendon

Nerve Supply: Femoral nerve (L2, L3, L4)

Functional Activities: Stepping activities such as climbing stairs and squatting

AKA: Vastus Intermedialis

Vastus Intermedius In-Depth

Vastus Intermedius runs down the front of the thigh, in-between vastus medialis and vastus lateralis, and underneath rectus femoris – it is the deepest of the quadriceps.

The muscles of the anterior thigh, highlighting vastus intermedius

It arises from fleshy fibres from the upper two-thirds of the anterior and lateral surfaces of the shaft of the femur. The fibres run downwards forming a broad tendon on the more superficial aspect (known as a superficial aponeurosis) which attaches to the deep surface of rectus femoris, vastus lateralis and vastus medialis forming the deep part of the quadriceps tendon. The quadriceps tendon attaches to the upper surface of the patella (kneecap), encompasses the patella and attaches to the tibial tuberosity via the ligamentum patellae.

Vastus Intermedialis is difficult to separate from vastus lateralis in the middle of the thigh and is frequently continuous with vastus medialis lower down, virtually impossible to separate.

Some of the deeper fibres of vastus intermedius attach to the superior aspect of the suprapatellar bursa which lies underneath the muscle. These fibres are referred to as the articularis genus, and arise from a small area on the lower third of the anterior femoral shaft, passing downwards to the bursa. The main function of the articularis genus is to stop the synovial membrane from becoming trapped and interfering with normal knee movement.

Vastus Intermedius is the hardest of the quadriceps muscles to stretch due to its position as the deepest and most central muscle. The other quadriceps muscles can be stretched by adding some bias to the stretch – rectus femoris by extending the hip and vastus lateralis and medialis by adding a sideways element to the stretch, usually through massage - vastus intermedialis is too deep to manipulate.

What Next?

Here are some other articles you may be interested in:

1) Knee Muscles: Find out more about the muscles that control the knee, including the other quadriceps muscles

2) Knee Stretches: Simple tests to see if you would benefit from knee stretches and easy to follow video guides for how to effectively stretch

3) Knee Strengthening Exercises: Learn how to effectively strengthen the quadriceps and other knee muscles with this range of exercises that you can do in your own home

4) Knee Pain Diagnosis: Suffering from knee pain? Find out how to diagnose you problem and learn how to treat it

Go to Anatomy Guide or Homepage

Muscles of the Lower Limb

Rectus Femoris
Vastus Lateralis
Vastus Medialis
Vastus Intermedius

Biceps Femoris

Gluteus Maximus
Gluteus Medius

Check out our book - Knee Arthritis: Take Back Control. Available in paperback or on Kindle

All the info you need, in our new book
Find out more

Read Reviews/ Buy Now


See Also

Knee Strengthening Exercises

Knee Stretches

Diagnose Your Pain

Knee Anatomy

Search This Site

Visitor Comments

“This is one of the best self-help & info sites of any medical condition I've ever seen. Excellent work.” Amy, UK

"Your site and exercises have been a lifesaver! The explanations are so clear.  Thanks for your help and excellent work."  Claire, US

"I'm an RN. This is really useful, easy to understand info."
Jan, US

“Thanks to Lots of improvement after just two days.” Suresh, India

"This is the best self-help site I have ever seen for knee pain. It is very difficult to find such a comprehensive volume of information on one site without being advised to "Just purchase this product!" Many, many thanks" Jennifer, US

"Superb site, many thanks, so much helpful content especially the targeted strengthening exercises for me.” Gerri, UK

“Thank you so much, your response makes so much sense. Thank you again for your time in answering my questions.” Cynthia, US

"Your website is a gold mine, thank you very much."
Gavril, Denmark

"Thank you for this website and all the information, especially the videos. I suffer from knee stiffness and pain when standing and now I have some exercises I can do - thanks to you." Claire, US

"I LOVE your website. Out of all the others, yours is so informational and easy to read." Michelle, US

"This is the best site dealing with knee problems that I have come across. I will be putting the stretches and exercises into practise. Thank you!"
Margaret, S. Africa

"The information given by you is fabulous. Thank you." Nihal, India

"Your site is excellent! It covers everything you need to know about knee pain and it's treatment in an easy to understand format. Thanks!" Linda, US

"Brilliant website - highly recommended! And as nurse (25yrs exp) its written expertly and is very explanatory and easy to understand. Thank you!" Jo, UK