1 Tire width is the width of the tire measured in mm from sidewall to sidewall. This tire width is 225 mm.  Aspect ratio is the ratio of the height of the tire's cross-section to its width. On our example, 60 means that the height is equal to 60% of the tire's width.
The infrahyoid muscles or strap muscles are a group of four paired muscles in the anterior neck below the hyoid bone. They are responsible for depressing the hyoid during swallowing. Each muscle is supplied by different nerves from the ansa cervicalis.
Sitting in a position where the head is held forward of the shoulders, such as reading or computer use, makes the upper back and shoulder muscles constantly work to hold the head up. Tension may build up due to daily stress. This causes tightness to build up in the upper shoulder and neck muscles, and can cause neck muscle strain. In the event of an unexpected sudden twisting movement, a car accident, or unaccustomed repetitive use of the neck, the neck muscles may become sprained or strained.