Advanced Bulbospongiosus Muscle Quiz

Q1. A lesion affecting the deep branch of the perineal nerve would most directly produce weakness of which action in a male?

• Contraction of the detrusor muscle
• Flexion of the hip
• Compression of the bulb and spongy urethra
• Relaxation of the internal urethral sphincter

Q2. A female patient has an isolated injury to bulbospongiosus. Which function would be most directly impaired?

• Contraction of the uterine wall
• Relaxation of the bladder detrusor
• Voluntary closure of the anal canal
• Compression of the bulbs of the vestibule

Q3. Which feature best explains why the anatomical arrangement of bulbospongiosus differs between males and females?

• The male muscle is composed of smooth muscle
• The vaginal opening separates the female muscle into right and left parts
• The female muscle lies entirely inside the pelvis
• Only females possess a perineal body

Q4. During the final phase of male urination, contraction of bulbospongiosus primarily acts on which urethral segment?

• Spongy urethra
• Preprostatic urethra
• Intramural ureter
• Prostatic urethra only

Q5. Why can contraction of bulbospongiosus contribute to maintenance of penile erection?

• It opens the superficial dorsal vein
• It helps restrict venous outflow from erectile tissue
• It directly increases arterial pressure throughout the internal iliac artery
• It relaxes the perineal membrane

Q6. During childbirth, damage involving the perineal body may weaken bulbospongiosus because of which anatomical relationship?

• Bulbospongiosus attaches to the perineal body
• Bulbospongiosus originates from the sacrum
• Bulbospongiosus forms the pelvic diaphragm
• Bulbospongiosus passes through the greater sciatic foramen

Q7. Which finding would best distinguish bulbospongiosus dysfunction from isolated ischiocavernosus dysfunction in a male?

• Loss of bladder detrusor contraction
• Loss of hip abduction
• Reduced ability to expel residual urine from the spongy urethra
• Loss of voluntary anal continence

Q8. A pudendal nerve lesion proximal to its perineal branches could impair bulbospongiosus function because the muscle depends on which type of innervation?

• Visceral afferent innervation only
• Parasympathetic innervation only
• Somatic motor innervation
• Sympathetic innervation only

Q9. Which combination correctly compares bulbospongiosus anatomy in males and females?

• It surrounds the rectum in males and the urethra in females
• It lies in the deep perineal pouch in males and the pelvic cavity in females
• It covers the crura in males and the ovaries in females
• It covers the bulb of the penis in males and the bulbs of the vestibule in females

Q10. Which statement best integrates the functional anatomy of the bulbospongiosus muscle?

• It is an autonomic sphincter surrounding the anal canal
• It is a deep hip muscle responsible for lateral rotation of the femur
• It is a pelvic smooth muscle responsible primarily for bladder contraction
• It is a superficial perineal muscle involved in erectile, sexual, and sex specific urogenital functions