Advanced Pubococcygeus Quiz

Q1. Which attachment pattern best describes pubococcygeus?

• Sacrum and sacrotuberous ligament toward the greater trochanter
• Iliac crest and inguinal ligament toward the pubic tubercle
• Pubis and anterior tendinous arch toward midline structures and the coccygeal region
• Ischial tuberosity and obturator membrane toward the femur

Q2. A lesion affecting the nerve to levator ani would most directly impair which pubococcygeus function?

• Lateral rotation of the extended thigh
• Dorsiflexion of the ankle
• Active elevation and support of the pelvic floor
• Extension of the knee

Q3. Weakness of pubococcygeus would most directly reduce resistance to which mechanical challenge?

• Anterior displacement of the femoral head during walking
• Compression of the tibiofibular joint during running
• Downward displacement of pelvic contents during increased intra-abdominal pressure
• Posterior displacement of the scapula during lifting

Q4. Which anatomical feature explains how pubococcygeus can influence pelvic outlet support?

• Its tendon passes through the lesser sciatic foramen
• Its fibers form the lateral wall of the obturator canal
• Its fibers insert primarily on the greater trochanter
• Its medial fibers are closely related to pelvic outlet structures

Q5. Which functional distinction between pubococcygeus and puborectalis is most accurate?

• Pubococcygeus provides broad pelvic support, while puborectalis forms the anorectal sling
• Pubococcygeus is the principal muscle forming the anorectal sling
• Pubococcygeus is noncontractile, while puborectalis is skeletal muscle
• Pubococcygeus forms the anorectal sling, while puborectalis rotates the thigh
• Pubococcygeus forms the lateral pelvic wall, while puborectalis forms the posterior wall

Q6. Why can injury to pubococcygeus during childbirth contribute to pelvic floor dysfunction?

• Injury closes the greater sciatic foramen
• Injury prevents lateral rotation of the femur
• Injury causes immediate obstruction of the internal iliac artery
• Loss of muscular support can permit greater downward displacement of pelvic structures

Q7. Damage near the pubic origin of pubococcygeus would most directly compromise which anatomical feature?

• Attachment of obturator internus to the femur
• Insertion of piriformis on the greater trochanter
• Anterior anchorage of the pelvic floor muscle
• Origin of coccygeus from the ischial spine

Q8. Why does pubococcygeus function together with endopelvic fascia in pelvic organ support?

• They function mainly to transmit the sciatic nerve
• Both structures act primarily as hip rotators
• They provide complementary active and passive support
• Both structures are noncontractile ligaments

Q9. During a sudden cough, which response involving pubococcygeus is most appropriate?

• Contraction to reinforce pelvic floor support
• Contraction to rotate the femur laterally
• Relaxation to increase downward visceral movement
• Complete relaxation to enlarge the pelvic outlet

Q10. Which statement best integrates the anatomy and function of pubococcygeus?

• It is a levator ani component that supports the pelvic floor and structures around pelvic outlets
• It is a superficial perineal muscle whose primary function is erectile tissue compression
• It is a lateral pelvic wall muscle that primarily rotates the thigh
• It is a posterior pelvic ligament extending from the sacrum to the ischium