Trachea annular ligaments of trachea. The epiglottis closes the opening to the larynx during swallowing. The trachea develops in the second month of development. It is lined with an epithelium that has goblet cells which produce protective mucins (see "Respiratory epithelium"). An inflammatory condition, also involving the larynx and bronchi, called croup can result in a barking cough. A tracheotomy is often performed for ventilation in surgical operations where needed. Intubation is also carried out for the same reason by the inserting of a tube into the trachea. From 2008, operations have experimentally transplanted a windpipe grown by stem cells, and
Spelling of Shakespeare's name centre is most commonly used, and why it is sometimes hyphenated. Kathman argues that any name that could be divided into two clear parts was liable to be hyphenated, especially if the parts could be interpreted as distinct words. Later editions of Shakespeare's works adopted differing spellings, in accordance with fashions of modernised spelling of the day, or, later, of attempts to adopt what was believed to be the most historically accurate version of the name. When he was referred to in foreign languages, he acquired even more variant spellings. 18th-century French critics were known to use "Shakpear, Shakespehar, Shakespeart,