Tensor fasciae latae (m. tensor fasciae latae)
This muscle plays an important role in stabilizing the lower limb and tensioning fascial structures.
- Origin: arises from the anterior superior iliac spine.
- Insertion point: muscle bundles weave into the iliotibial tract (tractus iliotibialis), which then attaches to the lateral condyle of the tibia.
- Functional significance: tensions the fascia lata, reliably stabilizes the knee joint, and actively participates in flexion and abduction of the thigh.
- Innervation: supplied by the superior gluteal nerve — n. gluteus superior (segments L₄–S₁).
- Blood supply: nourished by the superior gluteal artery (a. glutea superior) and the lateral circumflex femoral artery (a. circumflexa femoris lateralis).
Vastus lateralis muscle (m. vastus lateralis)
It is one of the most massive muscle structures in its group, responsible for powerful extension at the knee joint.
- Origin: starts from the greater trochanter and the lateral lip of the linea aspera of the femur.
- Insertion point: continues into the common tendon and contributes to the formation of the lateral patellar retinaculum.
- Functional significance: acts as the primary extensor of the leg and provides lateral stabilization of the patella, preventing its dislocation.
- Nerves and vessels: receives motor branches from the femoral nerve (n. femoralis). It is supplied by the lateral circumflex femoral artery (a. circumflexa femoris lateralis) and the profunda femoris artery (a. profunda femoris).
Adductor magnus muscle (m. adductor magnus)
This is a powerful adductor apparatus that also has significant topographical and clinical importance due to its tendinous structures.
- Origin: originates from the inferior ramus of the pubis and the ramus of the ischium, reaching the ischial tuberosity (tuber ischiadicum).
- Insertion point: attaches along the entire medial lip of the linea aspera (medial linea aspera) and to the adductor tubercle (adductor tubercle). The tendon loops over the medial epicondyle, forming the tendinous arch — hiatus adductorius.
- Functional significance: the main function is powerful adduction of the thigh. The posteromedial bundles partially extend the thigh. The muscle is also involved in rotational movements.
- Innervation: characterized by dual innervation. Most of the muscle mass receives branches from the obturator nerve (n. obturatorius), whereas the posterior bundles running to the adductor tubercle are innervated by the tibial portion of the sciatic nerve (n. ischiadicus).
- Blood supply: the primary source is the perforating arteries (aa. perforantes), with additional contribution from the obturator artery (a. obturatoria).
- Clinical significance: the hiatus adductorius serves as a crucial topographical landmark. This is where the femoral artery and vein (a./v. femoralis) exit the adductor canal, enter the popliteal fossa, and continue as the popliteal vessels (a./v. poplitea).
Briefly: answers to topical questions
Which muscles form the quadriceps femoris?
The quadriceps femoris (m. quadriceps femoris) consists of four heads that form a common tendon.
- Rectus femoris (m. rectus femoris) — originates from the anterior inferior iliac spine.
- Vastus lateralis (m. vastus lateralis).
- Vastus medialis (m. vastus medialis).
- Vastus intermedius (m. vastus intermedius).
All four heads unite into a common tendon that encompasses the patella and continues as the patellar ligament.
What branches does the profunda femoris artery give off?
The profunda femoris artery (a. profunda femoris) gives off three main groups of branches supplying blood:
- Medial circumflex femoral artery (a. circumflexa femoris medialis) — runs medially and posteriorly around the femoral neck.
- Lateral circumflex femoral artery (a. circumflexa femoris lateralis) — runs laterally beneath the rectus femoris.
- Perforating arteries (aa. perforantes, 3 branches) — pierce the tendons of the adductor muscles close to the bone.
Which muscles weave into the iliotibial tract?
Fibers of the following muscles contribute to the formation of the iliotibial tract (tractus iliotibialis) and its proximal origin:
- Tensor fasciae latae (m. tensor fasciae latae).
- Gluteus maximus (m. gluteus maximus).
These structures participate in stabilizing the knee joint in the sagittal plane.
To remember the dual innervation of the adductor magnus, keep in mind: it is so "magnus" that a single nerve is not enough — the obturator nerve supplies the anterior part (like other adductors), while the sciatic nerve assists posteriorly (like the posterior compartment muscles).
Class and exam questions
Where does the adductor canal end and the popliteal fossa begin?
The boundary is the tendinous hiatus of the adductor magnus — the hiatus adductorius. The femoral vessels pass through it, changing their name to popliteal.
Which muscle forms the lateral patellar retinaculum?
This structure is formed by the tendon of the vastus lateralis muscle (m. vastus lateralis).
Where does the tensor fasciae latae originate?
The muscle originates from the anterior superior iliac spine.
What else to study on this topic
- Topography of the adductor canal and popliteal fossa
- Formation of the iliotibial tract (tractus iliotibialis)
- Complete anatomy of the quadriceps femoris
- Blood supply features via aa. perforantes
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