dorsum - the posterior part of a human (or animal) body from the neck to the end of the spine; "his back was nicely tanned"saddle - posterior part of the back of a domestic fowl body part - any part of an organism such as an organ or extremity torso, trunk, body - the body excluding the head and neck and limbs; "they moved their arms and legs and bodies" small - the slender part of the back dorsal vertebra, thoracic vertebra - one of 12 vertebrae in the human vertebral column; thoracic vertebrae extend from the seventh cervical vertebra down to the first lumbar vertebra lumbar vertebra - one of 5 vertebrae in the human vertebral column; lumbar vertebrae extend from the twelfth thoracic vertebra down to the sacral vertebrae |