Lumbarlumbar areaLumbar.
"Calf" is the most common designation for a young bovine. However, the animal may be called a bull calf if it is a male or a heifer if it is a female.
Dorsal is the medical term meaning back.
Costovertebral is the medical term meaning pertaining to the spine and ribs.
Visceral means pertaining to the viscera, or internal organs.
Upper thoracic region
The caudal area is the medical term meaning tail region, although in humans it may be called the coccygeal region. Cauda means tail, and coccyx is tailbone.
Dorsum is a medical term meaning back. For example the dorsum of the hand is commonly known as the back of the hand.
Torso
Posterior.
The tailbone defines the coccygeal region. The sacral region is another term that might be used.
Posteroanterior means from back to front.