c. muscles of the pelvic region 1. internal oblique- compresses abdomen, flattens lumbar curve of...
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C. Muscles of the Pelvic Region
1. Internal oblique- compresses abdomen, flattens lumbar curve of the
spine
a. Originates from the pelvis
b. Inserts at ribs, pubic bone, and linea alba
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2. Muscles of the pelvic floor
a. Levator ani- split into two muscles
1. Pubococcygeus- supports and raises pelvic floor
constricts and draws anus toward pelvis
a. Originates from pelvis
b. Inserts at coccyx, urethra, anal canal,
and perineum
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2. Iliococcygeus- same function as
pubococcygeus
a. Originates from ischial spine
b. Inserts at coccyx
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b. Coccygeus- same as the levator ani plus pulls coccyx forward after defecation and childbirth
1. Originates from the ischial spine
b. Inserts at lower sacrum and upper coccyx
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3. The perineum- outlet of the pelvis, diamond shaped area at the
lower end of the trunk between the thighs and buttocks
a. Cut during an episiotomyb. Superficial transverse
perineus- stabilizes central tendon of the perineum
1. Originates from the ischial tuberosity
2. Inserts at the central tendon of perineum
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c. External anal sphincter- keep anal canal and orifice
closed
1. Originates from anacoccygeal raphe
2. Inserts at central tendon of perineum
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