维管形成层属于侧生分生组织，包括能够产生次生木质部与次生韧皮部的纺锤状形成层原始细胞和产生髓射线的射线原始细胞。
It is a lateral meristem and contains fusiform initials giving rise to secondary xylem and phloem and ray initials giving rise to medullary rays. See also secondary growth.
本病为最恶性的甲状腺癌，见于老年人，病理各异，包括纺锤状、鳞状和未分化细胞。
This is a particularly virulent form of thyroid carcinoma. It occurs in the elderly and has a variable pathology, including spindle, squamous, and anaplastic cells.
典型的纺锤细胞呈纺绽状，或者卵圆形细胞核。
典型的纺锤细胞呈纺绽状，或者卵圆形细胞核。
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