Shafik Ahmed, Shafik Ismail A, el-Sibai Olfat, Shafik Ali A
Department of Surgery and Experimental Research, Faculty of Medicine, Cairo University, Cairo, Egypt.
Int Urogynecol J Pelvic Floor Dysfunct. 2007 Aug;18(8):851-6. doi: 10.1007/s00192-006-0246-z. Epub 2006 Nov 24.
Both external anal sphincter (EAS) and bulbocavernosus muscle (BCM) have been shown anatomically and physiologically to constitute one muscle in males. We investigated the hypothesis that the EAS and BCM have similar anatomical pattern in females. The study consisted of cadaveric dissection, electromyographic recordings and inferior rectal nerve stimulation. Bulbocavernosus reflex action was performed in 16 healthy women before and after anesthetization of the EAS and BCM. The EAS extended forward across the perineal body and became continuous with the BCM in the labia majora. Glans clitoris (GC) or inferior rectal nerve stimulation effected synchronous EAS and BCM contractions with identical action potentials. GC stimulation while the EAS or BCM was anesthetized produced neither EAS nor BCM response. Similarly, stimulation of the anesthetized GC produced no EAS or BCM response. The BCM and EAS apparently constitute a single muscle, which seems to play dual and yet synchronous roles in fecal control and sexual response.
在男性中，经解剖学和生理学研究表明，肛门外括约肌（EAS）和球海绵体肌（BCM）构成一块肌肉。我们研究了一个假设，即女性的EAS和BCM具有相似的解剖结构。该研究包括尸体解剖、肌电图记录和直肠下神经刺激。在对16名健康女性的EAS和BCM进行麻醉前后，进行了球海绵体反射动作。EAS向前延伸穿过会阴体，并在大阴唇处与BCM相连。阴蒂头（GC）或直肠下神经刺激可使EAS和BCM同步收缩，并产生相同的动作电位。在EAS或BCM麻醉时进行GC刺激，不会引起EAS或BCM的反应。同样，刺激麻醉后的GC也不会引起EAS或BCM的反应。BCM和EAS显然构成一块单一的肌肉，它似乎在粪便控制和性反应中发挥着双重且同步的作用。
