Origin, Insertion, Nerve Supply, And Actions of The Muscles of The Front of The Thigh
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This muscle is thus referred to as because it is composed of 4 parts: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. It’s provided by the femoral nerve. It creates the majority of the mass on the anterior aspect of the thigh and is the strongest extensor of the knee joint.
All the parts of quadriceps cross only 1 joint, i.e., knee joint, with the exception of rectus femoris which crosses 2 joints, i.e., hip and knee joints.
It is composed of 3 or 4 muscular skids that are considered to be a separated part of the vastus intermedius.
It originates from the anterior surface of the lower part of the shaft of the femur, few centimeters above the patellar articular margin.
Into the upper part of the synovial membrane of the knee joint. Nerve Supply
It’s by a twig from the nerve to vastus intermedius.
The articularis genu pulls up the synovial membrane upward to prevent its damage when the knee is extended.
It’s the longest muscle in the entire body, which crosses the front of the thigh obliquely from the lateral to the medial side.
It appears from the anterior superior iliac spine and upper half of the notch immediately below it.
The muscle corkscrew obliquely through the thigh from lateral to medial side to reach the posterior aspect of the medial condyle of femur, where its tendon runs forwards to be added into the upper part of the medial outermost layer of the shaft of tibia in front of the insertions of gracilis and semitendinosus. The insertion of sartorius is inverted hockey stick -shaped.
It’s by the anterior section of the femoral nerve.
It bends both the hip and the knee joints, and adducts and rotates the thigh laterally to bring the lower limb into the sitting position of a tailor (Latin sartor: tailor)/” palthi position” embraced by Indian Hindus during meal.
Tensor Fasciae Latae
It’s a short thick muscle, which is located at the junction of the gluteal region and the upper part of the front of the thigh.
It appears from the outer lip of the iliac crest extending from the anterior superior iliac spine to the tubercle of the crest.
The muscle enters downward and somewhat backward and added into the iliotibial tract 3-5 cm below the level of the higher trochanter.
It’s by the superior gluteal nerve.
It abducts the hip joint and keeps the extended position of the knee joint via the iliotibial tract.
Morphologically, the tensor fasciae latae is a muscle of the gluteal region that has migrated on the lateral aspect of the thigh during the course of development but keeps its Nerve Supply. It’s provided by the superior gluteal nerve- the nerve of gluteal region.