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1 PELVIC BONES PELVIC BONES Hip bone Sacrum coccyx

1 PELVIC BONES PELVIC BONES Hip bone Sacrum coccyx

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Page 1: 1 PELVIC BONES PELVIC BONES Hip bone Sacrum coccyx

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PELVIC BONESPELVIC BONES

• Hip bone

• Sacrum

• coccyx

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Page 8: 1 PELVIC BONES PELVIC BONES Hip bone Sacrum coccyx
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PELVIC MUSCLESPELVIC MUSCLES

piriformis

obturator internus

levator ani

coccygeus

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Muscle Origin Insertion Action

piriformis anterior surface of sacrum

greater trochanter of femur

laterally rotates and abducts thigh

obturator internus the internal surface of the obturator

membrane and margin of the

obturator foramen

greater trochante laterally rotates and abducts the thigh

levator ani posterior surface of the body of the pubis, fascia of the obturator

internus m., ischial spine

perineal body, anococcygeal

body and coccyx

elevates the pelvic floor

coccygeusischial spine side of the coccyx and lower sacrum

elevates the pelvic floor

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• Levator ani is the main muscle of the pelvic floor. It forms a funnel-shaped diaphragm in the pelvis between the lateral hip walls, the pubis anteriorly and the coccyx posteriorly. It is traversed by different structures in each sex:

• males:

• urethra

• anal canal

• females:

• urethra

• vagina

• anal canal

• Often, levator ani is considered as several separate muscle parts:

• pubovaginalis

• iliococcygeus

• pubococcygeus

• puborectalis

• However they have common features:

• origin: from a tendinous arch between the pubis and ischial spine on the internal surface of the pelvis

• insertion:

• perineal body

• external wall of anal canal

• anococcygeal ligament

• coccyx

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