Iam lateral to the vertebral column, superior to the axillary region, inferior from the cervical region and at the most proximal position of the brachia. what body part am i?

Shoulder

Explanation:

Shoulder is the body part

The vertebral column right in the middle of our body, we have to look for something lateral to it, this means right next to the vertebral column could be left or right.

Superior means above. The axillary region is a group of body parts, between the neck and the arm where the armpit is, so now we have even a small region to focus on.

Inferior means that is below something, in this case, the cervical region. The cervical region are the vertebra right under the base of the skull until the beginning of the clavicle. So now we the mysterious body part is below the neck.

Proximal means close to the origin or reference point, brachia in this case. Finally, the brachia  the part of the arm from the shoulder to the elbow. So if the reference point is brachia, the closest thing of the brachia is the shoulder.