Trachea are generally highly elastic but they may calcify with age. The trachealis muscle connects the ends of the incomplete rings and contracts during coughing, reducing the size of the lumen of the trachea to increase the rate of air flow. The esophagus lies posteriorly to the trachea, adjoining along the tracheoesophageal stripe. Circular horizontal bands of fibrous tissue called the annular ligaments of trachea join the tracheal rings together. The cartilaginous rings are incomplete to allow the trachea to collapse slightly so that food can pass down the esophagus. A flap-like epiglottis closes the opening to the larynx during swallowing
The Name of the Rose known as Bernard of Morlaix). Medieval manuscripts of this line are not in agreement: Eco quotes one Medieval variant verbatim, but Eco was not aware at the time of the text more commonly printed in modern editions, in which the reference is to Rome ("Roma"), not to a rose ("rosa"). The alternative text, with its context, runs: "Nunc ubi Regulus aut ubi Romulus aut ubi Remus? / Stat Roma pristina nomine, nomina nuda tenemus". This translates as "Where now is Regulus, or Romulus, or Remus? / Primordial Rome abides only in its name; we hold only naked names." Also the