Which term specifically refers to an area of the body between a medial and lateral structure?

Intermediate

Explanation:

Medial structures are located towards the body's median plane, or midline; the midline divides the body from head to toe into left and right halves. Similarly, lateral structures lie on the side of the body, or part away from its middle; arms are lie laterally in relation to the torso which is medial in relation to the body's arms. Areas between these structures are defined as intmmediate.

Example: In relation to the breastbone (medial) and shoulder (lateral), the collarbone is intermediate.  

it's false.

"every person has their limitations which prevent us from accomplishing something. some are better than mathematics for example and some are worse. those people who are worse might never be able to become mathematicians, but that does not mean that they would not be great at doing something else."

the trait of personality falls in the middle of the diagram because personality is a mixture of ones nature and environment.