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.
Learning Objectives: Upon completion of this session, the student will be able to: Identify and list the attachments, innervation and action of the sternocleidomastoid, digastric and infrahyoid (strap) muscles. Identify the boundaries of the anterior and posterior cervical triangles and their subdivisions. Describe the cutaneous branches of the cervical plexus and identify their areas of distribution. Identify the deep cervical fascia, its various component layers and the resulting compartmentalization of the neck.