Clotting abnormalities, such as those caused by anticoagulant medications, should be reversed. Prophylactic antibiotics are given for 24 hours in the case of trauma. Blood clots may be retained within the pleural cavity despite chest tube drainage. They are a risk factor for complications like fibrothorax and empyema. Such retained clots should be removed, preferably with video-assisted thoracoscopic surgery (VATS). If VATS is unavailable, an alternative is fibrinolytic therapy such as streptokinase or urokinase given directly into the pleural space seven to ten days after the injury. The issues with fibrinolytic therapy include having a high cost and lengthened hospital stay. Residual clot that does not dissipate in response to fibrinolytics may require surgical removal in the form of decortication. Prognosis
The prognosis following a hemothorax depends on its size, the treatment given, and the underlying cause. While small hemothoraces may cause little in the way of problems, in severe cases an untreated hemothorax may be rapidly fatal due to uncontrolled blood loss. If left untreated, the accumulation of blood may put pressure on the mediastinum and the trachea, limiting the hearts ability to fill. However, if treated, the prognosis following a traumatic hemothorax is usually favourable and dependent on other non-thoracic injuries that have been sustained at the same time, the age of the person, and the need for mechanical ventilation. Hemothoraces caused by benign conditions such as endometriosis have a good prognosis, while those caused by neurofibromatosis type 1 has a 36% rate of death, and those caused by aortic rupture are often fatal.
The additional speech sounds that the human tongue enables us to produce, particularly [i], allow humans to unconsciously infer the length of the vocal tract of the person who is talking, a critical element in recovering the phonemes that make up a word. Non-mammals
Most tetrapod species possess a larynx, but its structure is typically simpler than that found in mammals. The cartilages surrounding the larynx are apparently a remnant of the original gill arches in fish, and are a common feature, but not all are always present. For example, the thyroid cartilage is found only in mammals. Similarly, only mammals possess a true epiglottis, although a flap of non-cartilagenous mucosa is found in a similar position in many other groups. In modern amphibians, the laryngeal skeleton is considerably reduced; frogs have only the cricoid and arytenoid cartilages, while salamanders possess only the arytenoids.Vocal folds are found only in mammals, and a few lizards. As a result, many reptiles and amphibians are essentially voiceless; frogs use ridges in the trachea to modulate sound, while birds have a separate sound-producing organ, the syrinx. History
The ancient Greek physician Galen first described the larynx, describing it as the "first and supremely most important instrument of the voice". Additional images
See also
Articulatory phonetics
Electrolarynx
Histology of the vocal cords
Origin of speech

References
Notes


=== Sources ===