📍 Anatomy

• Origin: Lateral border of the ischial tuberosity (the “sit bone”).
• Insertion: Quadrate tubercle on the intertrochanteric crest of the femur (between the greater and lesser trochanters) and the area just below it.
• Shape: Flat and rectangular (hence the name “quadratus”).

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🛠 Function

• External (lateral) rotation of the thigh at the hip joint.
• Assists in adduction of the thigh.
• Stabilizes the femoral head in the acetabulum (hip socket).

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🩺 Nerve Supply

• Nerve to quadratus femoris (branch of the sacral plexus, roots L4–S1).

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⚠ Clinical Note

• Less commonly injured, but can be strained in sports involving sudden rotation or forceful hip movements.
• Located just below the inferior gemellus — so in imaging (like MRI), inflammation here can be mistaken for hamstring or sciatic nerve issues.
• A tight quadratus femoris can contribute to deep gluteal pain and even entrapment of the sciatic nerve (runs just above it).

#Anatomy

📍 Anatomy

• Origin: Inner surface of the obturator membrane and surrounding bone (ischium & pubis) inside the pelvis.
• Pathway: The muscle passes through the lesser sciatic foramen, making a sharp bend around the ischium.
• Insertion: Medial surface of the greater trochanter of the femur (together with the superior & inferior gemellus tendons).
• Shape: Fan-shaped inside the pelvis, then narrows to a tendon outside.

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🛠 Function

• External (lateral) rotation of the thigh at the hip joint when extended.
• Abduction of the thigh when the hip is flexed.
• Stabilizes the femoral head within the acetabulum.

⸻

🩺 Nerve Supply

• Nerve to obturator internus (branch of sacral plexus, roots L5–S2).

⸻

⚠ Clinical Note

• Acts like a pulley: the tendon changes direction at the lesser sciatic notch.
• Can be irritated in deep gluteal syndrome, potentially mimicking piriformis syndrome.
• Since it’s close to pelvic floor muscles, overactivity can be linked to pelvic pain in some cases.

#Anatomy

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Pronation
Supination

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استخوان(1)

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استخوان (2)
ترمینولوژی

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مفاصل(1)

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مفاصل(2)
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انواع مفاصل
Synovial joints

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جزوات و تمام چیزایی که نیاز دارید برای ترم یک و دو
حتما برید تو این کانال خیلی مفیده

عضلات
Muscle

امیدوارم براتون مفید باشه
برای دوستاتون هم بفرستید

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آشنایی با سیستم عصبی

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Upper limb bones
استخونای بالا تنه

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