What do septal cells secrete?
What do septal cells secrete?
Septal cells found in alveoli secrete surfactant which causes lungs to inflate.
What is a frontal cell?
Frontal cells are anterior ethmoid air cells located along the anterior aspect of the frontal recess. They are a subset of frontal recess cells and are classified into four types according to Kuhn’s classification. They are seen on CT in 20-33% of patients 1.
What is septal tissue?
Interventricular septum, the wall separating the left and right ventricles of the heart. Lingual septum, a vertical layer of fibrous tissue that separates the halves of the tongue.
What is the function of septal cells in the alveolar wall?
The main function of the type I cell is the maintenance of a barrier to prevent leakage of fluid and proteins across the alveolar wall into the air spaces, while allowing gases to cross the air–blood barrier freely.
What is a Kuhn cell?
Kuhn classification is an anatomical classification for the subtypes of frontal cells: type 1 (~37%): a single air cell above the agger nasi cell. type 2 (~19%): two or more air cells above the agger nasi cell. type 3 (~7%): a single large cell above the agger nasi cell that extends into the frontal sinus.
What is a Haller cell?
Haller’s cells are defined as air cells situated beneath the ethmoid bulla along the roof of the maxillary sinus and the most inferior portion of the lamina papyracea, including air cells located within the ethmoid infundibulum.
What is septum made of?
Structure. The fleshy external end of the nasal septum is called the columella or columella nasi, and is made up of cartilage and soft tissue. The nasal septum contains bone and hyaline cartilage. It is normally about 2 mm thick.
What is the function of septum?
The septum separates the atria and ventricles in such a way that it forms a barrier between the heart chambers and this prevents mixing of oxygenated and deoxygenated blood.
What is septum alveoli?
The alveolar septum or wall consists of three components: epithelium (which lines the alveolus or air space), interstitium, and capillary endothelium. Gas exchange occurs in the alveoli across the thin epithelial lining and adjacent endothelium (air–blood barrier).
What is Agger nasi cell?
Agger nasi air cells are the most anterior ethmoidal air cells lying anterolateral and inferior to the frontal recess and anterior and above the attachment of the middle turbinate. They are located within the lacrimal bone and therefore have as lateral relations the orbit, the lacrimal sac and the nasolacrimal duct.
Are Haller cells normal?
Although a Haller’s cell is considered a normal anatomical variant, when enlarged it can significantly constrict the posterior aspect of the ethmoidal infundibulum and maxillary ostium from above.