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Chapter 10

Chapter 10. The Muscular System. Part E. Muscles of the Pelvic Floor (Pelvic Diaphragm). The pelvic diaphragm is composed of two paired muscles – levator ani and coccygeus These muscles: Close the inferior outlet of the pelvis Support the pelvic floor

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Chapter 10

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  1. Chapter 10 The Muscular System Part E

  2. Muscles of the Pelvic Floor (Pelvic Diaphragm) • The pelvic diaphragm is composed of two paired muscles – levator ani and coccygeus • These muscles: • Close the inferior outlet of the pelvis • Support the pelvic floor • Elevate the pelvic floor to help release feces • Resist increased intra-abdominal pressure

  3. Muscles of the Pelvic Floor (Pelvic Diaphragm) Figure 10.12a

  4. Muscles Inferior to the Pelvic Floor • Two sphincter muscles allow voluntary control of urination (sphincter urethrae) and defecation (external anal sphincter) • The ischiocavernosus and bulbospongiosus assist in erection of the penis and clitoris

  5. Muscles Inferior to the Pelvic Floor Figure 10.12b

  6. Muscles Inferior to the Pelvic Floor Figure 10.12c

  7. Extrinsic Shoulder Muscles • Muscles of the thorax • Anterior: pectoralis major, pectoralis minor, serratus anterior, and subclavius • Posterior: latissimus dorsi, trapezius muscles, levator scapulae, and rhomboids • These muscles are involved with the movements of the scapula including elevation, depression, rotation, and lateral and medial movements • Prime movers of shoulder elevation are the trapezius and levator scapulae

  8. Extrinsic Shoulder Muscles Figure 10.13a

  9. Extrinsic Shoulder Muscles Figure 10.13b

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