Answer:
a. inferior
b. medial
Step-by-step explanation:
There are three planes that are used to divide the human body: 1-transverse plane, which is a horizontal line that divides the body into a superior (above) section and an inferior (below) section; 2-median sagittal plane, which is a vertical line that divides the body into equal left and right portions; and, 3-coronal plane, which divides the body into a ventral (anterior) section and a dorsal (posterior) section. As its name indicates, inferior is the opposite term of 'superior' and refers to a structure that is 'below' something else (for example, the feet are inferior to the head). Moreover, a medial structure refers to a structure that is closer to the midline of the body, and therefore divides the body into equal right and left sections (for example, the nose is medial to the eyes).