They are trying to find their way through the zona pellucida, the membrane that surrounds and protects the egg.
它们试图找到通过保护卵细胞的透明带的路。
The two zones of adrenal cortex from capsule inwards: zona glomerulosa and the zona reticularis – can be seen here.
从这里可以看到从胶囊向内的两个肾上腺皮质区:肾小球状带和网状带。