Rachis

The inflorescence of Buddleja paniculata is arranged along a central rachis

Rachis /ˈreɪkᵻs/ is a biological term for a main axis or "shaft".

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.

单词	Rachidian
释义	Rachidian 英语百科 Rachis Rachis /ˈreɪkᵻs/ is a biological term for a main axis or "shaft". 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.
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Rachidian

Rachis