The trunk is in broad terms the body of the animal and is what would remain if the head and limbs were removed. It can be seperated in four parts, the cervical vertebrae, thorax, lumbar region and pelvis. Anatomically these structures are distinguishable and each area has distinctive shapes, sizes and physiological roles. | The trunk is in broad terms the body of the animal and is what would remain if the head and limbs were removed. It can be seperated in four parts, the cervical vertebrae, thorax, lumbar region and pelvis. Anatomically these structures are distinguishable and each area has distinctive shapes, sizes and physiological roles. |