anatomy & physiology Stephen EXERCISE 11 Name Lab Section Date Muscles of 1)The

Question

anatomy & physiology Stephen EXERCISE 11 Name Lab Section Date Muscles of 1)The rectus abdominis covers the anterior abdominal wall. Its superior attachment includes the xiphoid process and costal cartilages of ribs 5 through 7; its inferior attachment includes the pubic symphysis and pubic crest. The muscle depresses the ribs and flexes the vertebral column. Which attachment (superior or inferior) is the origin, and which is the insertion? Explain. suprabyvug mundks an rvated, the suprahyoid muscles are the agonists

Explanation / Answer

In most of the skeletal muscles, the origin is the attachment site that doesn't move during contraction, while the insertion is the attachment site that move when the muscle contracts. Rectus abdominis muscle depresses the ribs and flexes vertebral column. Therefore, the origin of rectus abdominis muscle is from the public symphysis and public crest and the insertion of the muscle is the xiphoid process and the costal cartilages of the ribs 5 through 7.

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