Beginner External Anal Sphincter Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. What type of muscle forms the external anal sphincter?
- Visceral smooth muscle only
- Smooth muscle
- Cardiac muscle
- Skeletal muscle
Q2. The external anal sphincter surrounds which structure?
- Sigmoid colon
- Anal canal
- Urinary bladder
- Ureter
Q3. Which function is most directly associated with the external anal sphincter?
- Peristalsis of the colon
- Voluntary maintenance of fecal continence
- Production of intestinal mucus
- Absorption of nutrients
Q4. Which nerve provides the principal somatic motor innervation to the external anal sphincter?
- Femoral nerve
- Obturator nerve
- Inferior rectal nerves
- Vagus nerve
Q5. The inferior rectal nerves usually arise from which nerve?
- Sciatic nerve
- Obturator nerve
- Pudendal nerve
- Femoral nerve
Q6. Which sphincter of the anal canal is composed of smooth muscle?
- Puborectalis
- Bulbospongiosus
- Internal anal sphincter
- External anal sphincter
Q7. How many traditional subdivisions are described in the external anal sphincter?
- Three
- Five
- One
- Two
Q8. Which of the following is a traditional part of the external anal sphincter?
- Peritoneal part
- Superficial part
- Mucosal part
- Visceral part
Q9. Which muscle forms a sling around the anorectal junction and works with the anal sphincters to maintain continence?
- Puborectalis
- Gluteus maximus
- Piriformis
- Obturator internus
Q10. What generally happens to the external anal sphincter during defecation?
- It closes the sigmoid colon
- It relaxes
- It contracts continuously
- It becomes part of the rectal wall