Two models showing the arrangement of the facial and neck muscles (left) and a midsagittal section of the head and neck (right). The sectioned model shows the cerebrum, the largest part of the brain, in yellow and the brainstem, the lower part of the brain, which connects the brain to the spinal cord. The largest tube at bottom right is the trachea and the narrower tube behind it the oesophagus. The model on the left shows the location of the muscle bundles around the eyes and mouth and also the muscles in the neck that control the movements of the head. On this model the parotid gland is found to the right of the ear.