anterior abdominal muscles

Question 1

rectus abdominis

Answer 1

• origin: pubic crest and the pubic symphysis
• insertion: xiphoid process,costal cartilages 5-7
• action: flexes the trunk,tenses anterior abdominal wall, depresses ribs(expiration)

Question 2

pyramidalis

Answer 2

• origin: pubic crest and symphysis, anterior to the rectus abdominis
• insertion: linea alba
• action: draws the linea alba inferiorly

Question 3

structures

Answer 3

• transversalis fascia
• rectus sheath: upper three quarters and lower one quarter
• arcuate line: inferior end of deep rectus sheath
• parietal peritoneum