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rachis
Rachis is a biological term for a main axis or "shaft".
==In zoology/microbiology==
In vertebrates a ''rachis'' can refer to the series of articulated vertebrae, which encase the spinal cord. In this case the ''rachis'' usually forms the supporting axis of the body and is then called the spine or vertebral column. ''Rachis'' can also mean the central shaft of pennaceous feathers.
In the gonad of the invertebrate nematode ''C. elegans'', ''rachis'' is a term used to describe the central cell-free core or axis of the gonadal arm of both adult males and hermaphrodites where the germ cells have achieved pachytene and are attached to the walls of the gonadal tube. The rachis is filled with cytoplasm.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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