The spine has thirty-three vertebrae, which are divided into five regions—the coccygeal, the sacral, the lumbar, the thoracic, and the cervical.

In the pig, it also takes origin higher up from the sacro-sciatic ligament and the coccygeal aponeurosis.

Among these structures are the spleen, the adrenals, the thyroid gland, the parathyroids, the thymus and the carotid and coccygeal bodies.