Question

Write a short note on intercoastal muscles?

Answer 1

The intercostal muscles are a group of 22 pairs of tiny muscles found between the ribs and helps information and movement of the chest wall. The intercostal muscles very help full in the process of respiration. These muscles help expand and shrink the size of the chest cavity to facilitate breathing. The 22 pairs of intercoastal muscles are grouped into 11 pairs of internal intercostal muscles and 11 pairs of external intercostal muscles. The external intercostal muscles are stimulated during deep inhalation to lift and spread the ribs. Because the ribs are fixed on their posterior ends to the vertebral column, contraction of the external intercostals lifts the anterior end of the ribs like a handle on a bucket. Deep exhalation uses the internal intercostal muscles to pull the ribs inferiorly and closer together. The compression of the ribs decreases the volume of the thoracic cavity, resulting in the forced exhalation of air from the lungs.