Tracheobronchial Tree

Tracheobronchial Tree

&

Bronchopulmonary Segments

D

the purpose of publication and general circulation.

aijazahmedkhan7@live.com

Objectives

Extent & bifurcation of trachea Tracheobroncheal tree

Features & types of bronchi:

Pr. (principal); Sec. (lobar) & Tertiary (Segmental) Bronchopulmonary segment (BPS)

BPS of Rt & Lt lungs

Features & types of brochioles:

Lobular, Terminal & Respiratory

Applied aspect

Respiratory Tract

Upper RT



Nasal cavity



PNAS



Nasopharynx

Lower RT



Larynx



Tracheobronchial tree

Transitional airways



Respiratory bronchiole



Alveolar duct

Nasal mucosa

Repiratory epithelium

TRACHEOBRONCHEAL TREE

 Trachea

 Primary/ Principal / Pulmonary Bronchi

 Secondary/Lobar bronchi

 Tertiary/Segmental bronchi

 --- ---- -- Terminal bronchi

 Bronchioles ( Conducting )

 --- Terminal bronchioles (Sec. lobule)

 Respiratory bronchiole (Pr. Lobule)

Cricoid/C6 to upper border T5; 10-11 cm, D= O/I =2/1.2 cm

Principal/

Primary/

Pulmonary bronchi

Angles of right & left bronch with carina

•Tracheal bronchus: Displaced Rt. Upper lobe brochus or

•supernumary bronchus from Rt. Lat side of trachea

Trachea

Sup. Mal Post.

BPS of the Lungs

Relationship between central airways

&

pulmonary vessels

The numbers denote the numbers of BPS

Bronchi

In bronchi:



Epithelium – less tall



Goblet cells – lesser in No.



Lamina propria – More elastic tissue



Submucosa – fewer glands



Cartilage – interconnected plates

Trachea vs Bronchi

Lt. & Rt.

BPS; Medial.

Bronchioles

Large bronchiole

Smooth muscles & seromucous glands

Segmental bronchi

ramify in a

structurally separate, functionally

independent, unit of lung tissue called a

BPS

Lung Lobules: Pr. & Sec

30-50 Pr. Lobule = 1 Sec. lobule –

The smallest

Schematic

Distal portion of adjacent BPS

Transitional airway

Respiratory bronchiole & Alveolar duct



Ciliated columnar - to - Ciliated cuboidal



Goblet cells - to - Clara cells (tall, non-ciliated)



Smooth Mm conti. Layers - to – discont. Layer



Submucosal glands (+) - to – Absent



Alveoli absent - to – small No. of single alveoli

Lobular bronchiole to Resp. bronchiole

The respiratory portion of the lung & its cell types



Diameter: 250 µ



Number: 300 million



Area: 143 m



Diffusion barrier: 0.2 µ (0.05 -0.2 µ)



Interalveolar pore: 7 µ (2-13 µ)

Alveoli

Applied Aspect

Bronchoscopy

Bronchogram

Bronchiectasis

Tracheostomy

Segmental Resection

D

the purpose of publication and general circulation.

aijazahmedkhan7@live.com

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