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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.

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Presentation on theme: "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."— Presentation transcript:

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2 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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4 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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6 2. Iliococcygeus- same function as pubococcygeus a. Originates from ischial spine b. Inserts at coccyx

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8 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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10 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 episiotomy b. 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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12 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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