Intermediate External Anal Sphincter Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Which are the three traditionally described parts of the external anal sphincter?
- Subcutaneous, superficial, and deep
- Mucosal, submucosal, and muscular
- Anterior, middle, and posterior
- Superior, inferior, and lateral
Q2. The superficial part of the external anal sphincter attaches posteriorly primarily to which structure?
- Sacral promontory through the anterior longitudinal ligament
- Ischial spine through the sacrospinous ligament
- Pubic tubercle through the inguinal ligament
- Coccyx through the anococcygeal ligament
Q3. The superficial external anal sphincter is attached anteriorly primarily to which central perineal structure?
- Sacral promontory
- Perineal body
- Pubic symphysis
- Ischial spine
Q4. Which part of the external anal sphincter is closely associated superiorly with puborectalis?
- Subcutaneous part
- Deep part
- Mucosal part
- Cutaneous part
Q5. Which part of the external anal sphincter lies most inferiorly around the anal opening?
- Internal anal sphincter
- Subcutaneous part
- Deep part
- Puborectalis
Q6. Which statement correctly compares the internal and external anal sphincters?
- Both sphincters are entirely smooth muscle
- The internal sphincter is smooth muscle, while the external sphincter is skeletal muscle
- The internal sphincter is skeletal muscle, while the external sphincter is smooth muscle
- Both sphincters are entirely skeletal muscle
Q7. Which spinal nerve levels contribute to the pudendal nerve that supplies the external anal sphincter?
- S2 to S4
- L1 to L3
- L4 to S1
- T10 to T12
Q8. In addition to inferior rectal nerves, the external anal sphincter may receive direct motor contributions from which sacral level?
- C8
- T6
- L1
- S4
Q9. Which action of the external anal sphincter helps postpone defecation when the rectum is distended?
- Involuntary peristalsis
- Secretion of mucus
- Relaxation of the rectal wall
- Voluntary contraction
Q10. Which structures work together most directly to provide muscular closure and angulation at the anorectal region?
- Piriformis, obturator internus, and coccygeus
- Internal anal sphincter, external anal sphincter, and puborectalis
- Bulbospongiosus, ischiocavernosus, and cremaster
- Gluteus maximus, gluteus medius, and gluteus minimus