Hoarseness can be caused by a number of conditions. The most common cause of hoarseness is acute laryngitis (inflammation of the vocal cords) caused most often by an upper respiratory tract infection (usually viral), and less commonly from overuse or misuse of the voice (such as from yelling or singing). Other causes of hoarseness include: 1  benign vocal cord nodules, cysts or polyps, 2  gastroesophageal reflux (GERD), 3  allergies, 4  inhalation of respiratory tract irritants, 5  smoking, 6  thyroid problems, 7  trauma to the larynx/vocal cords, 8  neurological conditions (such as Parkinson's disease and strokes), and. 9  cancer of the larynx.
Intercostal muscles are muscle groups that are situated in between the ribs that create and move the chest wall. The muscles are broken down into three layers, and are primarily used to assist with the breathing process.hey raise the ribs and expand the chest cavity, and originate from ribs one through 11, with insertion from ribs two to 12. The internal intercostal muscles are responsible for forced exhalation. They depress the ribs and decrease space in the chest cavity.
The external intercostal muscles consist of 11 muscles that envelop each side of the exterior of the rib cage from the back of the ribs and wrapping around where they are attached to the sternum in front.he intercostal muscles expand and compress the rib cage to allow your body to breath. The intercostal muscles are those muscle bands that surround the ribs. Intercostal muscles respond to the contraction of the diaphragm.