QUADRANT CARDS

NASAL CAVITY

• Structure- divided by a midline nasal septum
• Have mucosa which line it and rests on a rich network of thin-walled veins
• Function- warms the air that is inhaled, moistens the air and traps incoming bacteria
• The ciliated cells of the nasal mucosa create a current which move contaminated mucus back towards the pharnyx

PHARYNX

• Structure- Similar to a red garden hose in it's circularness
• Open muscular tube that is circular
• Serves as a common passageway for food and air
• Air enters the upper portion from the nasal cavity

LARYNX

• formed by eight rigid hyaline car tilages and a spoon-shaped flap of elastic cartilage,
• The epiglotis, the Adam's apple also protrudes inferiorly from the Larynx
• Function- plays a role in speech
• Function- routes air and food into the proper channels

TRACHEA

• Has c-shaped rings of hyaline cartlidge
• Has a fairly rigid structure because of it's walls
• Function- the open parts of the rings abut the esophagus and allow it to expand when swallowing.
• The closed parts of the rings support the trachea walls and keep it patent, or open, in spite of pressure changes.

MAIN BRONCHI

• Structure: right main bronchus is wider, shorter, and straighter than the left.
• Consequently, it is the more common site for an inhaled foreign object to become lodged
• Each main bronchus runs obliquely before it goes into the medial depression (hilus) of the lung on its own side
• Each of the main bronchi is fromed by the division of the trachea

LUNGS

• Each lung is divided into lobes by fissures; the left lung has two lobes, and the right lung has three.
• the walls of the thoracic cavity are lined by the parietal pleura. The pleural membranes produce pleural fluid
• allows the lungs to glide easily over the thorax wall during breathing movements
• causes the two pleural layers to cling together. The pleurae can slide easily from side to side across one another, but they strongly resist being pulled apart. Consequ