Dominic Stone
The sartorius muscle is a strap-like muscle that originates at the anterior extremity of the iliac crest of the pelvis. It is the longest muscle in the human body and winds around the front of the thigh to insert on the front of the tibia on its medial side. The sartorius is a long muscle that requires extensive vascular supply from several sources. It is also susceptible to inflammation at the pes anserine bursa, located at the insertion of the muscle, which can cause pain, swelling, and functional impairment. The anterior superior iliac spine (ASIS) is a bony projection of the iliac bone and an important landmark of surface anatomy, providing attachment points for the sartorius muscle, among other structures.
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What You'll Learn
The sartorius muscle is the longest in the human body
The sartorius muscle is the longest muscle in the human body. It is a strap-like muscle that originates at the anterior superior iliac spine of the pelvis and winds around the front of the thigh, inserting on the medial side of the tibia. The sartorius muscle is a long muscle that crosses both the hip and knee joints, producing movement in both. It receives its innervation from the femoral nerve L2 and L3.
The sartorius muscle has an extensive vascular supply, with different sections of the muscle receiving blood from different sources. The proximal third may receive its vascular supply from the branches of the femoral, deep femoral, or lateral circumflex femoral arteries. The middle third is supplied by branches of the femoral artery, while the distal third receives blood from the femoral artery and descending genicular artery.
The pes anserine bursa, located at the insertion of the sartorius muscle, can become inflamed when chronically overstrained, such as during jogging or breaststroking. Symptoms of pes anserine bursitis include pain, swelling, and functional impairment of the three muscles inserting at the pes anserinus (sartorius, semitendinosus, and gracilis muscles).
The sartorius muscle plays a role in several anatomical structures. It forms the lateral border of the femoral triangle, an important anatomical space that contains the femoral artery, vein, and nerve. The sartorius muscle also crosses the surfaces of several other muscles, including the iliopsoas, pectineus, and adductor longus.
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The sartorius winds around the front of the thigh
The sartorius muscle is the longest muscle in the human body. It originates at the anterior superior iliac spine (ASIS) of the pelvis and winds around the front of the thigh, inserting on the medial side of the tibia. This muscle is strap-like and crosses both the hip and knee joints, allowing for movement at both joints.
The vascular supply of the sartorius is extensive due to its length. The proximal third of the muscle may receive its vascular supply from the femoral artery, deep femoral artery, lateral circumflex femoral artery, or the artery of quadriceps. The middle third is supplied by branches of the femoral artery, while the distal third receives blood from the femoral artery and descending genicular artery.
The pes anserine bursa, located at the insertion of the sartorius muscle, can become inflamed due to chronic overuse, such as through activities like jogging or breaststroking. This inflammation, known as pes anserine bursitis, can cause pain, swelling, and functional impairment of the muscles inserting at the pes anserinus (sartorius, semitendinosus, and gracilis muscles).
Overall, the sartorius muscle plays an important role in lower body movement and function, and its length and position around the front of the thigh contribute to its extensive vascular supply and potential for inflammation at the pes anserine bursa.
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The tensor fasciae latae muscle attaches to the iliac tubercle
The tensor fasciae latae (TFL) is a muscle that originates from the anterior superior iliac spine (ASIS) and the anterior aspect of the iliac crest. It is a thin, fusiform type of skeletal muscle. The TFL muscle plays a crucial role in the movement and stabilisation of both the hip and the knee. It assists in medial rotation, abduction, and flexion of the thigh at the hip joint.
The TFL muscle attaches to the iliac tubercle, which is located on the lateral aspect of the superior anterior iliac spine. This attachment point is approximately 5 cm away from the ASIS. The TFL muscle also attaches to the deep fascia and the superficial fascia of the iliotibial (IT) band, which runs along the lateral aspect of the thigh.
The IT band is a large fascial expansion that originates on the ASIS and covers the TFL muscle proximally. The IT band then extends along the lateral aspect of the thigh, attaching to the lateral condyle of the tibia, specifically to the Gerdy tubercle. This attachment allows the TFL muscle to act on the tibia, facilitating its lateral rotation.
The TFL muscle is innervated by the superior gluteal nerve, with roots originating from lumbar nerve 4, 5, and the first sacral nerve (L4-S1). The deep branch of the superior gluteal artery supplies the TFL with blood, making it an important vascular structure in the region.
The TFL muscle can be palpated and tested through specific movements and resistance exercises. For example, the Ober's test evaluates a tight, contracted, or inflamed TFL and IT band. Additionally, the TFL can be palpated by placing one hand at the lateral side of the thigh above the knee and the other hand at the proximal anterolateral thigh while instructing the patient to abduct the limb.
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The pes anserine bursa can become inflamed
The sartorius muscle is a strap-like muscle that originates at the anterior superior iliac spine (ASIS) of the pelvis and winds around the front of the thigh to insert on the medial side of the tibia. The pes anserine bursa is a thin, fluid-filled sac located on the inside of the knee joint, which helps to cushion the joint and prevent bones from rubbing against each other.
The condition can cause severe, stabbing pain on the medial aspect of the knee, which may worsen with activities such as climbing stairs, rising from a seated position, or sitting with crossed legs. The pain may persist and gradually develop into mild erythema and edema within hours to days. However, it is important to note that the pain can also subside spontaneously and become recurrent for months.
The treatment for pes anserine bursitis typically includes non-steroidal anti-inflammatory drugs (NSAIDs) to reduce pain and swelling. Initial treatment recommendations also include ice and relative rest for the affected knee. In some cases, local injections of corticosteroids or surgical decompression of the bursa may be necessary if conservative treatments are ineffective.
It is important to differentiate pes anserine bursitis from tendinitis, as both conditions involve similar symptoms due to the close proximity of the tendons and bursa in the affected area. However, the management and treatment options for both conditions are often the same, focusing on reducing inflammation and managing pain.
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The anterior superior iliac spine is a bony projection of the iliac bone
The anterior superior iliac spine (ASIS) is a bony projection of the iliac bone, marking the anterior extremity of the iliac crest of the pelvis. It is a prominent and palpable structure, providing an attachment point for several muscles and ligaments.
The sartorius muscle, the longest muscle in the human body, originates at the ASIS and winds around the front of the thigh to insert on the medial side of the tibia. The sartorius muscle is involved in producing movements at both the hip and knee joints. It is supplied by several arteries, including the femoral artery and its branches, and receives innervation from the femoral nerve (L2 and L3).
The tensor fasciae latae muscle also attaches to the ASIS, specifically to its lateral aspect. This muscle originates just lateral to the proximal attachment of the sartorius muscle. The inguinal ligament, another structure attaching to the ASIS, forms the superior border of the femoral triangle, an important anatomical space.
The ASIS serves as a key surface landmark for surgical procedures and clinical examinations. It aids in localizing nearby structures such as the inguinal ligament, common femoral artery, and base of the vermiform appendix. The ASIS is also useful in measuring true lower limb length. Given its proximity to the subcostal nerve, the anterior superior iliac spine is susceptible to damage, which can result in varying severities of symptoms.
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Frequently asked questions
The anterior superior iliac spine (ASIS) is a bony projection of the iliac bone.
The sartorius, tensor fasciae latae, and inguinal ligament all attach to the ASIS.
The sartorius is the longest muscle in the human body, winding around the front of the thigh.
The sartorius muscle is involved in the movement of the hip and knee joints. It can become inflamed (pes anserine bursitis) when chronically overstrained.
