Tires â Retreading is less expensive than new tires and is a large portion of this cost. Although mere pennies per mile, an average tire can cost over $250 and annual tire expenses can exceed $4,000 ($0.03 per mile), enough to purchase 16 new tires annually, but still not enough to replace every tire of an 18-wheeler.
With the head in a forward position, a passive tensile force is created in the hyoid muscles resulting in hyoid muscle tension, causing the mandible to be depressed and translated posteriorly. The patient is therefore forced to contract the temporalis and masseter muscles to keep the mouth closed.
Watch lateral flexion here : Look straight ahead and then bring your chin down toward your chest. This is neck flexion, and the anterior scalene acts in it. The other muscles involved include the sternocleidomastoid (itâs in everything!), longus capitis, and longus colli.If you look straight ahead, then turn your head to the side, this is contralateral head rotation.atch lateral flexion here : Look straight ahead and then bring your chin down toward your chest. This is neck flexion, and the anterior scalene acts in it. The other muscles involved include the sternocleidomastoid (itâs in everything!), longus capitis, and longus colli.