tensor fascia lata origin: – anterior aspect of iliac crest – anterior superior iliac spine...
TRANSCRIPT
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TENSOR FASCIA LATA• Origin:
– anterior aspect of iliac crest – anterior superior iliac spine (ASIS)
• Insertion: anterior aspect of IT band, below greater trochanter • Action:
– hip flexion – medially rotate & abduct a flexed thigh – tenses IT tract to support femur on the tibia during standing
• Blood: – superior gluteal artery – lateral femoral circumflex artery
• Nerve: superior gluteal nerve, L4,5,S1
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TENSOR FASCIA LATA (cont’d)
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GLUTEUS MAXIMUS• Origin:
– outer rim of ilium (medial aspect) – dorsal surface of sacrum and coccyx – sacrotuberous ligament
• Insertion: – IT band (primary insertion) – gluteal tuberosity of femur
• Action: – powerful extensor of hip – laterally rotates thigh – upper fibers aid in abduction of thigh – fibers of IT band stabilize a fully extended knee
• Blood: – inferior gluteal artery (primary) – superior gluteal artery
• Nerve: inferior gluteal nerve, L5,S1,2
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GLUTEUS MAXIMUS (cont’d)
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GLUTEUS MEDIUS• Origin:
– outer aspect of ilium (between iliac crest and anterior and posterior gluteal lines)
– upper fascia (AKA gluteal aponeurosis)• Insertion: superior aspect of greater trochanter • Action:
– anterior and lateral fibers abduct and medially rotate the thigh – posterior fibers may laterally rotate thigh – stabilizes the pelvis and prevents free limb from sagging during
gait• Blood: superior gluteal artery • Nerve: superior gluteal nerve, L4,5,S1
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GLUTEUS MEDIUS (cont’d)
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GLUTEUS MINIMUS• Origin: outer aspect of ilium (between anterior and
inferior gluteal lines) • Insertion: – greater trochanter (anterior to medius) – articular capsule of hip joint
• Action: – abduct and medially rotate the thigh – stabilizes the pelvis and prevents free limb from sagging
during gait• Blood: superior gluteal artery • Nerve: superior gluteal nerve, L4,5,S1
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GLUTEUS MINIMUS (cont’d)
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GLUTEAL MUSCLES
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PIRIFORMIS• Origin: pelvic surface of sacrum (anterior portion) • Insertion: medial surface of greater trochanter
(through greater sciatic foramen) • Action: – lateral rotation of extended thigh – abducts a flexed thigh
• Blood: – superior gluteal artery – inferior gluteal artery
• Nerve: nerve to piriformis, S1,2
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PIRIFORMIS (cont’d)