Human neck anatomy, artwork. This dissection of the neck shows the larynx (voicebox) at the upper end of the trachea (windpipe, blue). These structures have been removed and are at lower left, including the thyroid gland (yellow) that partially encloses the larynx. Tissues within the neck in the main artwork include muscles (red bands), nerves (yellow strands), veins (blue), arteries (bright red), and fat layers (yellow). Partially seen, revealed by the removal of the trachea, is the oesophagus (gullet, red with white rings of cartilage). The two main blood vessels are the internal jugular vein and the external carotid artery of the left-hand side of the neck.