Intermediate Perineal Muscles Quiz

Q1. What is a major action of the male bulbospongiosus muscle?

• Constriction of the rectum by smooth muscle
• Flexion of the lumbar spine
• Extension of the hip
• Compression of the bulb and spongy urethra

Q2. In females, the bulbospongiosus muscle is associated with which structures?

• Bulbs of the vestibule and vaginal opening
• Ureters and bladder
• Rectum and sigmoid colon
• Ovaries and uterine tubes

Q3. The ischiocavernosus muscle arises primarily from which region?

• Sacral promontory
• Femoral head
• Anterior superior iliac spine
• Ischial tuberosity and ischiopubic ramus

Q4. What is the primary supportive action of the superficial transverse perineal muscles?

• Extending the knee
• Stabilizing the perineal body
• Elevating the diaphragm
• Rotating the femur laterally

Q5. Which branch of the pudendal nerve commonly supplies the superficial perineal muscles?

• Superior gluteal nerve
• Pelvic splanchnic nerve
• Deep branch of the perineal nerve
• Femoral branch of the genitofemoral nerve

Q6. Which muscle receives somatic motor supply primarily through the inferior rectal nerves?

• Detrusor muscle
• Internal urethral sphincter
• Internal anal sphincter
• External anal sphincter

Q7. Contraction of ischiocavernosus helps maintain erection primarily by what mechanism?

• Increasing urine flow through the ureters
• Relaxing the external urethral sphincter
• Opening the anal canal
• Compressing erectile tissue and reducing venous outflow

Q8. Which muscle complex is particularly important for voluntary urinary continence?

• Bulbospongiosus only
• Ischiocavernosus only
• Internal anal sphincter
• External urethral sphincter complex

Q9. Which pair of muscles attaches to or blends with the perineal body and contributes to its stability?

• Piriformis and obturator internus
• Gluteus medius and gluteus minimus
• Psoas major and iliacus
• Bulbospongiosus and superficial transverse perineal

Q10. Which statement best distinguishes the external anal sphincter from the internal anal sphincter?

• The internal sphincter is a ligament
• The external sphincter is cardiac muscle
• The external sphincter is skeletal muscle, while the internal sphincter is smooth muscle
• Both sphincters are composed entirely of smooth muscle