Arrows indicate the directions of hernias through these fossae.是什么意思？

Arrows indicate the directions of hernias through these fossae.

圆括号内是尸检发现每个隐窝的检出率.

arrows

n. 箭( arrow的名词复数 )，矢，箭号，箭头；

例句
Warriors armed with bows and arrows and spears have invaded their villages.
佩带弓箭和长矛的武士闯入了他们的村庄。

indicate

vt. 表明，标示，指示，象征，暗示，预示，[医]显示需要做…的治疗；

例句
Reports from the area indicate that it was a bloodless coup...
发自该地区的报道表明这是一次不流血的政变。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

directions

n. direction的复数形式，方面( direction的名词复数 )，方向，指南，（电影导演的）指点；

例句
I should know by now not to throw away the directions until we've finished cooking...
现在我知道了不该在饭没做完之前就扔掉烹饪说明。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

hernias

n. 疝，脱肠， （内脏）突出，<医>疝，突出( hernia的名词复数 )；

例句
Arrows indicate the directions of hernias through these fossae.
圆括号内是尸检发现每个隐窝的检出率.

through

prep. 通过，穿过，经由，透过，凭借；adv. 从头到尾，彻底，自始至终；adj. （电话）接通，通话完毕，有洞的，直达的；

例句
The proposal was instantly voted through with two to one in favour, accompanied by enthusiastic applause...
在热烈的掌声中，提案以2比1的优势很快通过了表决。

these

adj. 这些的；pron. 这些；

例句
There's lots of money about these days for schemes like this.
近来这类计划资金充足。

fossae

n. [医] 窝，凹，窝，凹( fossa的名词复数 )；

例句
Conclnsion: The cisterna longitudinal cerebrum and cisterna fossae lateralis cerebri was increasing after 50 years old.
结论: 50岁以后大脑纵裂池和大脑外侧窝地明显增大.