These parasympathetic neurons make the rectum contract and the internal anal sphincter relax.

这些副交感神经元可以使直肠收缩，并使肛门内括约肌松弛。

He'd enjoy them when they came out.

他很喜欢把他们从肛门里排出来的感觉。

It's related to anal retentive fixation, which is supposedly the result of unresolved conflicts between you and your caregivers during potty training But like so many things Freud thought it's kind of bogus.

这与肛门固有关，据说这源于便盆训练期间，你与看护者之间未解决的冲突。但像弗洛伊德认为的很多事情一样，这并非事实。

The large intestine — consisting of the colon, rectum, and anus — is relatively short, at about one and half meters, and it provides a nice little frame for the small intestine, here at the end of the alimentary canal.

大肠——由结肠、直肠和肛门成——相对较短，大约 1.5 米，它为小肠提供了一个漂亮的小框架，在消化道的末端。

In fact, the enteric nervous system, which is an extensive mesh-like network of neurons that controls your entire digestive tract from the esophagus to the anus, doesn't even require the brain at all.

事实上，肠道神经一个由神经元成的网状网络，从食道到肛门的整个消化道，它甚至不需要大脑。

He put one of his feet on the fish and slit him quickly from the vent up to the tip of his lower jaw.

他用一只脚踩在鱼身上，从肛门朝上，倏的一刀直剖到它下颌的尖端。

Unlike its cousin, ulcerative colitis, which only affects the large intestine, Crohn disease causes inflammation and tissue destruction anywhere along the gastrointestinal tract, from the mouth to the anus.

虽与溃疡性结肠炎同属炎症性肠病，但溃疡性结肠炎只侵犯大肠，而克罗恩病能引起胃肠道任何部位的炎症和织破坏，上至口腔，下达肛门。

Symptoms of cauda equina include decreased bowel and bladder control due to a decreased tone of anal sphincters and muscle wall of the bladder and decreased sexual function.

马尾神经综合征的症状，包括排便和膀胱能力；这由于肛门括约肌和膀胱壁肌肉张力下降引起的，以及性功能下降。

Instead, from the gut, bacteria get to the rectum, anus and eventually colonizes the perineum, becoming part of the normal flora.

相反，细菌由肠道到达直肠、肛门，最终定居于会阴，成为正常菌群的一部分。

16 and 18 have been associated with cervical cancers and other types of cancers, including anal cancer and penile cancer.

HPV 16 型和 18 型与宫颈癌及其他癌症（如肛门癌和阴茎癌）相关。

During life's three billion-plus year journey on Earth, anal evolution happened independently many times in different branches of life.

在生命在地球上 30 亿多年的旅程中，肛门进化在不同的生命分支中独立发生了许多次。

Meanwhile, signals are sent to the brainstem and thalamus, and when these decide the right moment has come, they allow the external anal sphincter to relax - and feces goes, hopefully, into the toilet bowl.

直肠发出的信号同时也发送到了脑干和丘脑；当它们认定“时机成熟”时，便会下达指令使肛门外括约肌松弛；粪便就能——不出意外的话——顺利排入马桶。

But nature's full of exceptions, and strangely, some animals have lost their anuses.

但自然界充满了例外，奇怪的，有些动物失去了肛门。

You're not giving me a rectal. Do not ask me to cough.

不许给我做肛门指诊。不要让我咳嗽。

Now, I'm quite sure that you're familiar with the key players here — they're the hollow organs that form the continuous tube that is your alimentary canal, aka the gastrointestinal tract, which runs from your mouth to your anus.

现在，我很确定你对这里的关键选手很熟悉——它们形成连续管子的中空器官，也就你的消化道，也就胃肠道，从你的嘴延伸到你的肛门。

Treatment is typically surgical resection of the area that's lacking the nerve fibers, and then the healthy end is connected to the anus.

治疗疾病一般行根治手术，切除神经纤维缺失的肠段，然后将剩余肠段健康的一端连肛门。

As varied as the animal kingdom's anuses are, none of them have bones.

尽管动物王国的肛门种类繁多，但没有一个肛门有骨头的。

In your mouth, in your esophagus, and at the other end of things, at your anus, you have stratified squamous epithelial tissue, just like your epidermis, to help resist the abrasive action of like, chewing, like corn chips, maybe.

在你的嘴里，在你的食道里，在东西的另一端，在你的肛门里，你有分层的鳞状上皮织，就像你的表皮一样，帮助抵抗研磨作用，比如咀嚼，比如玉米片，也许。

Brittle stars and many parasites had ancestors with anuses, but no longer have them.

海蛇尾和许多寄生虫的祖先有肛门，但现在已经没有了。

We — and all animals from the simplest worms on up the Tree of Life — are really just tubes, corridors of tissue running from a mouth to an anus.

我们——以及生命之树上最简单的蠕虫——实际上只管子，从嘴到肛门的织走廊。