In Depth: Muscles. The major muscle in the chest is the pectoralis major. This large fan-shaped muscle stretches from the armpit up to the collarbone and down across the lower chest region on both sides of the chest. The two sides connect at the sternum, or breastbone.
Listen for bowel sounds for atleast 1 min in each quadrant and you should hear anywhere from 5-30 bowel sounds in each quadrant. If you don't hear anything or (0-4 bowel sounds) in a quadrant after 1 minute listen for a full 5 min. 0 to 4 bowel sounds heard in 5 min are called hypoactive Bowel sounds, more than 30 bowel sounds in a minute are called hyperactive... Hope this helps you ;--) May 14, '09.
Studies have found that a fetus can hear sounds, though muffled, at as early as 20 weeks and by the third trimester their hearing is intact. Sonograms show that your baby may turn their head in response to a noise. According to the American Academy of Pediatrics (AAP), the whooshing sound your baby hears in your womb is, to them, louder than a vacuum cleaner!