是指在减数第一次分裂前期中紧接偶线期的时期。在这一时期，已完成染色体联会的两条同源染色体互相紧靠，进而缠绕在一起，基质开始附着到染色丝上，成为一条短而粗的染色体。结果在这时期后外观上是染色体数目减半（即假减数）。
n. pachynema
misc. pachytene stage
从早粗线期到晚粗线期联会复合体逐渐伸长；
The synaptonemal complexes stretch gradually from the early pachytene to late pachytene.
在粗线期每条染色体实际已由两条染色单体组成。
Each chromosome in pachytene actually have been composed of two chromatids.
应用界面铺浮技术制备出完整的家蚕精母细胞粗线期接合丝复合体。
Complete pachytene synaptonemal complexes from spermatocytes of the silkworm (Bombyx mori) are stretched out by water spreading technique.
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