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.
extrinsic muscle (em). Etymology: L, extrinsecus, on the outside. 1 a muscle that is outside the organ it controls, as the extraocular muscles that control eye movements. 2 a muscle that links a limb to the trunk of the body.