体节（somite）为动物胚胎中身体分节发育的单位。

在原始甲壳类中，体节被认为是身体构造的一部分。再现生甲壳类身上，某些体节可能已经融合。

A somite is a division of the body of an animal or embryo.

Somites are bilaterally paired blocks of paraxial mesoderm that form along the head-to-tail axis of the developing embryo in segmented animals. In vertebrates, somites subdivide into the sclerotomes, myotomes and dermatomes that give rise to the vertebrae of the vertebral column, rib cage, and part of the occipital bone; skeletal muscle, cartilage, tendons, and skin (of the back).