| category |
details |
| etymology |
- – derived from the Greek bronchos, meaning “windpipe.” –
- “mainstem” refers to its primary division from the trachea.
|
| aka and abbreviation |
– right main bronchus (RMB). |
| definition |
- – the larger and more vertical of the two primary bronchi. –
- originates at the carina and directs airflow to the right lung.
|
| principles |
- – structural classification: – a conducting airway facilitating airflow into the right lung. –
- diameter and length: – shorter, wider, and more vertical than the left main bronchus. –
- aspiration risk: – more prone to foreign body aspiration due to its alignment with the trachea.
|
| parts |
- – proximal segment near the carina. – mid-segment before branching. –
- distal segment leading into secondary bronchi. –
- branches: –
- right upper lobe bronchus. –
bronchus intermedius. – right middle lobe bronchus. – right lower lobe bronchus.
|
| size |
- – length: ~2.5 cm. – diameter: ~13 mm.
|
| shape |
- – cylindrical. – slightly tapering distally.
|
| position |
- – arises from the carina at
- T4-T5 vertebral level. –
- enters the right hilum of the lung. – courses more vertically than the left main bronchus.
|
| character |
- – rigid but flexible: –
- maintains airway patency while allowing for movement.
|
| time |
- – develops during
- embryonic weeks 4–7. –
- ranches from the laryngotracheal tube.
|
| blood supply |
- – arteries: –
- right bronchial artery
- (branch of thoracic aorta or intercostal arteries).
|
| venous drainage |
- veins: –
- bronchial veins. –
- drains into the azygos system.
|
| lymphatic drainage |
- – right hilar lymph nodes
- (station 10R). –
- right paratracheal lymph nodes (station 4R). –
- subcarinal lymph nodes (station 7). –
- lower paratracheal nodes (station 3p).
|
| nerve supply |
- parasympathetic: – vagus nerve (CN X).
- sympathetic: – sympathetic trunk.
|
| embryology |
- – arises as a primary division of the tracheobronchial tree.
|
| histology |
- epithelium: –
- pseudostratified ciliated columnar epithelium with goblet cells. –
- cartilage: – incomplete cartilaginous rings transitioning to plates distally.
|
| physiology & pathophysiology |
- – facilitates airflow to the right lung. –
- high susceptibility to obstruction due to vertical alignment. –
- pathophysiology: –
- aspiration pneumonia. –
- foreign body obstruction. –
- bronchial stenosis.
|
| diseases |
- common: –
- aspiration-related lung infections. –
- right main bronchial stenosis. –
- less common: –
- infection: – tuberculosis.
- neoplasms: –
- malignant: – bronchogenic carcinoma.
- benign: – bronchial hamartoma.
- mechanical disorders: – extrinsic compression from lymphadenopathy.
|
| radiology |
- – CXR:
- right main bronchus visible as an air column. – displacement may indicate lung pathology.
- CT: – preferred for evaluating bronchial patency and lesions. –
- MRI: – limited role but useful in tumor invasion assessment.
|
| key points & pearls |
- more vertical than the left main bronchus
- important for aspiration risk. –
- CXR assessment: –
- look for shifts in tracheobronchial angle in pathology. –
- CT is the gold standard for evaluating airway compromise.
|
THE RIGHT – SHORT STOUT AND CUTE
