Everything about The Fascia Lata totally explained
The
fascia lata is the
deep fascia of the
thigh.
Thickness
It is an investment for the whole of the thigh, but varies in thickness in different parts.
Thus, it's thicker in the upper and lateral part of the thigh, where it receives a fibrous expansion from the
Glutæus maximus, and where the
Tensor fasciæ latæ is inserted between its layers; it's very thin behind and at the upper and medial part, where it covers the
Adductor muscles, and again becomes stronger around the knee, receiving fibrous expansions from the tendon of the
Biceps femoris laterally, from the
Sartorius medially, and from the
Quadriceps femoris in front.
Above and behind
The fascia lata is attached, above and behind, to the back of the
sacrum and
coccyx; laterally, to the
iliac crest; in front, to the
inguinal ligament, and to the
superior ramus of the
pubis; and medially, to the
inferior ramus of the pubis, to the inferior ramus and tuberosity of the
ischium, and to the lower border of the
sacrotuberous ligament.
From its attachment to the iliac crest it passes down over the
Glutæus medius to the upper border of the
Glutæus maximus, where it splits into two layers, one passing superficial to and the other beneath this muscle; at the lower border of the muscle the two layers reunite.
Laterally
Laterally, the fascia lata receives the greater part of the tendon of insertion of the Glutæus maximus, and becomes proportionately thickened.
The portion of the fascia lata attached to the front part of the iliac crest, and corresponding to the origin of the Tensor fasciæ latæ, extends down the lateral side of the thigh as two layers, one superficial to and the other beneath this muscle; at the lower end of the muscle these two layers unite and form a strong band, having first received the insertion of the muscle.
This band is continued downward, under the name of the
iliotibial band (tractus iliotibialis) and is attached to the lateral condyle of the
tibia.
The part of the iliotibial band which lies beneath the
Tensor fasciæ latæ is prolonged upward to join the lateral part of the capsule of the
hip-joint.
Below
Below, the fasciæ lata is attached to all the prominent points around the
knee-joint, viz., the
condyles of the femur and tibia, and the
head of the fibula.
On either side of the
patella it's strengthened by transverse fibers from the lower parts of the Vasti, which are attached to and support this bone.
Of these the lateral are the stronger, and are continuous with the iliotibial band.
The deep surface of the fascia lata gives off two strong
intermuscular septa, which are attached to the whole length of the linea aspera and its prolongations above and below; the lateral and stronger one, which extends from the insertion of the
Glutæus maximus to the
lateral condyle, separates the
Vastus lateralis in front from the short head of the
Biceps femoris behind, and gives partial origin to these muscles; the medial and thinner one separates the
Vastus medialis from the
Adductores and
Pectineus.
Besides these there are numerous smaller septa, separating the individual muscles, and enclosing each in a distinct sheath.
Crural fascia
The
crural fascia is a continuation of the fascia lata.
Etymology
It is named from its great extent.
Additional images
Image:Gray542.png|The superficial branches of the internal pudendal artery.
Image:Gray545.png|Femoral sheath laid open to show its three compartments.
Further Information
Get more info on 'Fascia Lata'.
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