University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

390

Pages:

2
Author:

Mariam A. A.

THE NOSE ● Cleans, warms and humidifies the air before it goes into the lungs and respiratory tract 1. Inhalation of air through the external nose - Nasal bone - Tip of nose is made up of hyaline cartilage and gives nose shape 2. Air travels through the nostrils (nares) - Anterior opening - Guard hairs trap the large particles that try to get in with the air 3. The air is warmed and humidified in the nasal cavity (conchae) - Vestibule (most anterior part of the nasal cavity) - Stratified squamous (nonkeratinized) epithelial cells - Resist mechanical stresses - Guard hairs are there and large particles get trapped there - Superior nasal concha - Middle nasal concha - Inferior nasal concha - Concha is the 'spiral shaped bone' under the mucus membrane (also known as turbinates), which spin the air around to trap any large particles - Creates turbulence in the nasal cavity to catch any large particles - Membranes have arteries with heat from the blood which warms the air - Nasal cavity proper (mucus membranes and concha) - Pseudostratified columnar epithelium - Have goblet cells that produce mucus to trap particles missed by the guard cells - Ciliated epithelial cells to transport the mucus out of the nasal cavity 4. Air then goes to the choanae which is connected to the pharynx - Posterior nasal opening - Opens into the nasopharynx Note: concha and choanae are NOT the same - Conch shell has a spiral configuration - Choanae is the posterior opening of the nose (like a tunnel)