The shoulder blade sits on the back as the scapula, so the surface region that maps to it is the scapular region. This area covers the patch of skin overlying the scapula on the upper back. The other terms refer to different parts: vertebral region runs along the spine, sural is the calf region, and frontal refers to the front of the head and trunk.

Right and left unequal parts are created by a parasagittal plane. A sagittal plane runs vertically and divides the body into left and right portions; when the division is exactly along the midline, it’s the mid-sagittal (or median) plane. If the cut is off-center, producing unequal sides, that’s the parasagittal plane. Other planes slice different directions: the frontal (coronal) plane separates front from back, and the transverse (horizontal) plane separates top from bottom. So, the described plane is parasagittal.

The lower back region is called the lumbar region. It corresponds to the area of the lumbar vertebrae (L1–L5), positioned between the thoracic (mid back) region above and the sacral/pelvic region below. The term lumbar comes from Latin for loin or lower back, a label you’ll see in phrases like lumbar spine or lumbar puncture. In contrast, the thoracic region is the chest and upper back, the umbilical region centers around the belly button, and the cephalic region refers to the head.

Stomach and spleen occupy the upper part of the abdomen in the standard nine-region map. The stomach lies mainly in the epigastric region, which is the upper middle area just below the rib cage. The spleen is located in the left hypochondriac region, the upper left region beneath the left ribs. So the best pair names the epigastric region for the stomach and the left hypochondriac region for the spleen. Other options place these organs in regions that don’t match their primary locations: the umbilical region is around the navel; the right hypochondriac region is upper right (where the liver and gallbladder sit); and the left lumbar and hypogastric regions are lower, not where the stomach or spleen are primarily found.