| Direction | |
| Toward the head end or upper part of the body | |
| Away from the head end or toward the lower part of the body | |
| Toward or at the front of the body | |
| Toward or at the back of the body | |
| Toward or at the midline of the body; on the inner side of | |
| Away from the midline of the body; on the outer side of | |
| Between a more medial and a more lateral structure | |
| Close to the origin of the body part or the point of attachment | |
| Farther from the origin of a body part or the point of attachment | |
| Toward or at the body surface | |
| Away from the body surface; more internal | |