Session 1.1j- TeachMeAnatomy - Tracheobronchial Tree Flashcards
http://teachmeanatomy.info/thorax/organs/tracheobronchial-tree/
What forms the tracheobronchial tree?
The trachea, bronchi and bronchioles
What do the trachea, bronchi and bronchioles form?
The TRACHEOBRONCHIAL TREE
What is the tracheobronchial tree?
A system of airways that allow passage of air into the lungs, where gas exchange occurs.
Where does gas exchange occur?
In the lungs
Where are these airways (tracheobronchial tree) located?
In the neck and thorax.
What marks the beginning of the tracheobronchial tree?
The trachea
Where does the trachea arise?
At the lower border of CRICOID CARTILAGE in the neck
What is the trachea a continuation of?
The larynx
Where does the trachea transvel inferiorly?
Into the SUPERIOR MEDIASTINUM
Where does the trachea bifurcate?
At the level of the sternal angle
What occurs to the trachea at the level of the sternal angle?
It bifurcates, forming the right and left main bronchi.
Where is the trachea in relation to the oesophagus?
Anterior
What structure lies posterior to the trachea?
The OESOPHAGUS
The trachea lies slight ___?
As it descends, it inclines slightly to the right.
How is the trachea held open?
By cartilage
What structures of the respiratory tract are held open by cartilage?
All of the larger respiratory airways, including the trachea
What is the structure of the trachea?
It is organised in C-SHAPED rings.
What are the tracheal rings supported by?
The free ends of these rings are supported by the TRACHEALIS MUSCLE.
What is the trachea lined by?
Ciliated pseudostratified columnar epithelium
What are the bronchi lined by?
Ciliated pseudostratified columnar epithelium
The trachea and bronchi are lined by ciliated pseudostratified columnar epithelium, interspersed by what?
GOBLET CELLS
What do goblet cells produce?
Mucus
The combination of what forms the functional mucociliary escalator?
The combination of sweeping movements by the cilia and mucus from the goblet cells
The combination of sweeping movements by the cilia and mucus from the goblet cells form what?
The MUCOCILIARY ESCALATOR.
What does the mucociliary escalator do?
Acts to trap inhaled particles and pathogens, moving them up out of the airways to be swallowed and destroyed.
What lies at the bifurcation of the primary bronchi?
A ridge of cartilage
What is the ridge of cartilage that lies at the bifurcation of the primary bronchi called?
The CARINA
Where does the carina run?
Anteroposteriorly between the openings of the two primary bronchi.
What is the most sensitive area of the trachea for triggering the cough reflex?
The carina.
The carina can be seen on ___?
bronchoscopy.
The trachea receives what innervation from where?
Sensory; RECURRENT LARYNGEAL NERVE.
Where does the arterial supply to the trachea come from?
The tracheal branches of the INFERIOR THYROID ARTERY
What is the venous drainage to the trachea?
Via the brachiocephalic, azygos and accessory hemiazygos veins.
The trachea bifurcates into the right and left main bronchi, where?
At the level of the sternal angle.
What happens to the right and left main bronchi?
They undergo further branching to produce the secondary bronchi.
What do secondary bronchi supply?
Each secondary bronchi supplies a lobe of the lung.
What do secondary bronchi give rise to?
Several segmental bronchi
What makes up the roots of the lungs?
The main bronchi, along with branches of the pulmonary artery and veins.
Along with branches of the pulmonary artery and veins, the main bronchi make up what?
The ROOTS of the lungs.
What is the structure of the right main bronchus?
Wider, shorter, and descends more vertically than its left-sided counterpart
Which bronchus is wider, shorter, and descends more vertically?
RIGHT MAIN BRONCHUS