Your chin is inferior to your forehead but superior to your knees. Coronal sections follow front to back, as though cutting through a corona, or halo, around the head. In medical terms anterior means front, and posterior means back. The following animation runs anteriorly from the nose to the posterior of the head.
Sagittal sections follow from one side of the body to the other - left to right, or right to left.
In medical terms lateral means 'outside', and medial 'inside' in the sense of lying in the middle. The following animation traverses through the body from the right shoulder to the left, and back again. To simplify the visualization of 3D structures from 2D images, try this short animation of the sagittal sections . Specific organs have been marked in the images. Focus on a single organ, and follow how it appears in different sections.