Fascia lata

Structure and boundaries

The fascia lata surrounds the muscles of the entire region and has the following boundaries and features:

• Superiorly: fused with the inguinal ligament (lig. inguinale).
• Posteriorly: continues into the gluteal fascia.
• Inferiorly: extends downward and continues into the crural fascia (fascia cruris), which is thinner on the anterior surface and thickened on the posterior and medial surfaces.
• Surface: the outer part is distinguished by its special density. The fascia forms isolated sheaths for the superficial muscles: tensor fasciae latae (m. tensor fasciae latae), sartorius (m. sartorius), adductor longus (m. adductor longus), and gracilis (m. gracilis).

Intermuscular septa

The fascia sends septa deep into the thigh, creating isolated compartments for muscle groups:

• Lateral intermuscular septum (septum intermusculare femoris laterale) — a strong sheet at the lateral boundary of the region. It separates the anterior and posterior fascial compartments.
• Posterior intermuscular septum (septum intermusculare femoris posterior) — covers the posterior surface of the adductor magnus muscle. It separates the posterior fascial compartment from the medial one.

Iliotibial tract

On the lateral surface of the thigh, the fascia thickens to form the iliotibial tract (tractus iliotibialis).

• Origin: from the iliac crest (crista iliaca) and the aponeuroses of the gluteus maximus (m. gluteus maximus) and tensor fasciae latae (m. tensor fasciae latae).
• Insertion: anterior to the lateral condyle of the tibia (Gerdy’s tubercle).
• Function: stabilization of the knee joint in the sagittal plane; acts as a "passive stabilizer" during running and walking. In case of contracture of the m. tensor fasciae latae, this stabilization is impaired.

Topography and adjacent structures

The fascia lata is closely connected with the neurovascular and lymphatic structures of the thigh:

• Saphenous opening (hiatus saphenus) — an opening in the fascia where the cribriform fascia (lamina cribrosa) is formed. The great saphenous vein of the leg (v. saphena magna) passes through it, draining into the femoral vein, along with lymphatic vessels. The femoral canal also opens here.
• Lymph nodes: superficial inguinal nodes (nodi lymphoidei inguinales superficiales) lie superficial to the fascia lata and are divided into superomedial, superolateral, and inferior groups. Deep inguinal nodes are located beneath the fascia, on the anterior wall of the femoral vein.
• Nerves: superficial branches of the femoral nerve (rr. cutanei anteriores) pierce the fascia lata through the sheath of the sartorius muscle, heading toward the skin.
• Bursae: on the anterior surface of the knee lies the subcutaneous prepatellar bursa (bursa subcutanea prepatellaris), which is an important clinical landmark and is frequently inflamed in stonemasons.

Clinical significance

Due to its strength and surface area, the fascia lata is widely used as a plastic material in surgery:

• Neurosurgery: in decompressive craniectomy for severe brain edema or extensive ischemic stroke, a fascial patch is sutured into the dura mater. This allows the edematous brain to "herniate outward" and prevents a fatal rise in intracranial pressure.
• Maxillofacial surgery: according to M. V. Mukhin's technique, a strip of fascia lata measuring 3 × 10 cm is transplanted in combination with muscle flaps from the masseter muscle to restore mobility to the lower lip during reconstructive plastic surgery.

Class and exam questions

What else to study on this topic

• Crural fascia (fascia cruris)
• Femoral canal and saphenous opening
• Thigh muscles and their fascial compartments
• Superficial and deep inguinal lymph nodes

Other topics in the "Anatomical Structures" section

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.