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 intercostal muscles are the muscles that lie between the ribs  and form the chest wall. Their function is to aid inhalation and  exhalation.he diaphragm is stimulated the same way all other muscles are-nerve impulses that originate in the brain (or sometimes the spinal cord). The intercostal muscles expand duri â¦ ng inhalation and contract during exhalation in response to the movement of the lungs by the diaphragm. Valentin Popov.