APA 1313 Lecture Notes - Lecture 4: Xiphoid Process, Abdominal External Oblique Muscle, Abdominal Wall

• School: University of Ottawa
• Department: Human Kinetics
• Course: APA 1313
• Professor: Li Jingxion

Document Summary

Lecture 4: muscles of the head and the trunk. Sternocleidomastoid(scm) is a two-headed muscle, the key muscular landmark in the neck. Superior attachment: mastoid process of temporal bone and superior nuchal line of occipital bone. Sternal head: anterior surface of manubrium of sternum. Clavicular head: superior surface of medial third of clavicle. Acting unilaterally(one side), laterally exes and rotates the head and neck so the ear approaches the shoulder of the same side. Their origin and insertion are in the same region. One of muscle attachments is in other region. They extend from the pelvis to the skull. Speci cally act on the vertebral column, maintain posture and produce movements of vertebral column. Innervated by posterior rami of spinal nerves. An extensive fascial sheet that splits into anterior and poster layers, enclosing the deep back muscles. They cover and hold the deep vertical muscles in position. Arises from nuchal ligament and spinous process of c7-t3 or t4 vertebrae.