Collectively, these muscles are known as the hamstrings and are involved with extension of the hip and flexion of the knee. Thankfully, the posterior compartment is simpler. This is an Advert - we use these to keep SimpleMed free! If you see something you like, please click on it - it supports the site :) They contribute to flexion of the hip joint. This muscle is a combination of both the psoas major and iliacus muscles, hence the name. It originates from the ilium and attaches to the medial tibia. This muscle makes up the fourth muscle of quadriceps femoris. Vastus Medialis – originating from the medial lip of the linea aspera.Vastus Intermedialis – originating from the anterior surface of the femoral shaft.Vastus Lateralis – originating from the lateral lip of the linea aspera.They all attach to the patella via the patella tendon. These muscles are responsible for extension of the knee joint. There are three vastus muscles that contribute the quadriceps femoris group of muscles. It’s placement within the body allows it to flex and adduct the hip joint. This is a flat muscle that runs from the anterior surface of the pubis to the pectineal line of the femur. It flexes, abducts and laterally rotates the hip joint and flexes the knee joint. It runs from the anterior superior iliac spine and runs inferomedially to the medial tibia. It is long, thin and is the most superficial of the anterior compartment muscles. This muscle is the longest in the body and runs in an oblique fashion across the anterior thigh. Note that the vastus intermedialis tucked underneath the rectus femoris and is, therefore, not visibleĬreative commons source by OpenStax College Generally speaking, these muscles act to flex the leg at the hip joint and can also act on the knee joint.ĭiagram - Muscles of the anterior thigh. The muscles of the anterior compartment of the thigh are innervated by the femoral nerve. Pink represents the anterior compartment, green is the medial compartment and blue represents the posterior compartment For more information, please check out our Anatomical Terminology Article.ĭiagram - The fascial compartments of the thigh. It is also very important when studying muscles that you are comfortable with anatomical terminology, as a lot is used in these articles. These compartments are separated by layers of fascia. There are many muscles in the thigh, however, they can be categorised into the anterior, posterior and medial compartments. The muscles of the thigh are responsible for a variety of movements, acting on both the hip and the knee joint.
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