Rachis

 ( Vertebrate Anatomy ) 

In biology, a rachis (from the rhákhis, "backbone, spine") Henry George Liddell, Robert Scott, A Greek–English Lexicon, ράχις is a main axis or "shaft".

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In zoology and microbiology In , 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 Vertebral column or vertebral column. Rachis can also mean the central shaft of pennaceous feathers.

In the gonad of the invertebrate nematode Caenorhabditis elegans, a rachis is the central cell-free core or axis of the gonadal arm of both adult males and where the have achieved pachytene and are attached to the walls of the gonadal tube. The rachis is filled with cytoplasm.

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In botany In , a rachis is the main axis of a compound structure. It can be the main stem of a compound leaf, such as in Acacia or , or the main, flower-bearing portion of an inflorescence above a supporting peduncle. Where it subdivides into further branches, these are known as rachillae (singular rachilla). The central spine that remains when an Abies seed cone disintegrates is also called the rachis.

A ripe head of wild-type wheat is easily shattered into dispersal units when touched or blown by the wind. A series of layers forms that divides the rachis into dispersal units consisting of a small group of flowers (a single spikelet) attached to a short segment of the rachis. This is significant in the history of agriculture, and referred to by archaeologists as a "brittle rachis", one type of shattering in crop plants.

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See also

• Stipe (botany)