HLSC 2F95 Lecture Notes - Lecture 5: Respiratory Epithelium, Club Cell, Esophagus

• School: Brock University
• Department: Health Sciences
• Course: HLSC 2F95
• Professor: dr.macpherson

Document Summary

Air leaves the pharynx by passing through a narrow opening, called the glottis. A cylinder whose cartilaginous walls are stabilized by ligaments and/or skeletal muscles. Begins at vertebrae c3 or c4 and ends at c7. Unpaired cartilages of the larynx: thyroid cartilage (largest, cricoid cartilage, epiglottis (closes over the glottis to prevent food from going into the respiratory system) Air passing between the vocal cords creates sound. Pitch depends on the diameter, length, and tension of the vocal cords. Amplification of sound occurs in the sinus cavities. Production of definite sounds depends on movements of the lips, tongue, cheeks. Apex points superiorly and the base inferiorly. Right lung has 3 lobes: superior, middle, inferior, consists of horizontal and oblique fissure. Left lung has 2 lobes: superior and inferior, contains the oblique fissure, has a cardiac notch lungs are enveloped in a sack pleural membranes. Right and left pleural cavities are separated by a mediastinum.