4-Piece Bronchus Training Model

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Model Number: NH-77327

Brand: Niche Healthcare



This 4 Piece Bronchus Model demonstrates the tissue changes occurring in asthma and chronic bronchitis. It clearly displays normal bronchus, hypersecretion of the mucous gland, swelling with lymphoid aggregations and smooth-muscle spasm. The model includes cartilage, mucous glands and plug, spiralling smooth muscles, and the fibroelastic connective tissue and epithelial layers of the bronchus.


SKU: VS8357492 Category: Tag:


Categories         Anatomical Model

Subject               Medical Science

Material              Eco-friendly PVC

Application       School/Hospital/Laboratory


The bronchi are major air passages in the respiratory system that conduct air from the trachea into the lungs. Here are the key features and aspects of the bronchi:


Primary (Main) Bronchi:

  • The trachea divides into two primary bronchi: the right main bronchus and the left main bronchus.
  • The right main bronchus is shorter, wider, and more vertical than the left, making it more common for inhaled objects to become lodged here.
  • The left main bronchus is longer, narrower, and more horizontal.

Secondary (Lobar) Bronchi:

  • Each primary bronchus divides into secondary bronchi, each serving one lobe of the lung.
  • The right lung has three lobes (superior, middle, and inferior), so it has three secondary bronchi.
  • The left lung has two lobes (superior and inferior), so it has two secondary bronchi.

Tertiary (Segmental) Bronchi:

  • Secondary bronchi further divide into tertiary bronchi, each serving a specific bronchopulmonary segment of the lung.
  • The right lung typically has 10 tertiary bronchi, and the left lung has 8-10 tertiary bronchi.

Smaller Bronchi:

Tertiary bronchi continue to divide into smaller bronchi and eventually into bronchioles.

Histological Features


The walls of the primary bronchi contain C-shaped cartilaginous rings similar to the trachea, which provide structural support and maintain airway patency.

As bronchi branch into smaller bronchi, the cartilage changes from rings to irregular plates and eventually disappears in bronchioles.


The bronchi are lined with pseudostratified ciliated columnar epithelium, which helps in trapping and moving mucus and debris out of the respiratory tract.

Goblet cells within this epithelium secrete mucus.

Smooth Muscle:

Smooth muscle fibres are present in the walls of the bronchi, allowing them to constrict and dilate, thus regulating airflow.


The submucosa contains glands that secrete mucus to trap particles and pathogens.


Air Conduction:

The primary function of the bronchi is to conduct air from the trachea into the lungs, ensuring it reaches the alveoli where gas exchange occurs.

Filtration and Defense:

The ciliated epithelium and mucus-secreting cells in the bronchi play a crucial role in trapping and removing inhaled particles, pathogens, and debris.

Airway Resistance Regulation:

The smooth muscle in the bronchi can contract or relax, influencing airway diameter and resistance. This regulation is essential for controlling the amount of air entering the lungs.

Clinical Relevance


Inflammation of the bronchi, often caused by infection or irritants, leading to symptoms like coughing, mucus production, and wheezing.


A chronic condition characterized by bronchoconstriction, inflammation, and increased mucus production, resulting in difficulty breathing and wheezing.

Bronchogenic Carcinoma:

A type of lung cancer originating in the bronchi. It can cause symptoms such as persistent cough, haemoptysis (coughing up blood), and chest pain.

Foreign Body Aspiration:

Objects inhaled into the airway are more likely to lodge in the right main bronchus due to its anatomical features. This can cause obstruction and requires prompt medical attention.

In summary, the bronchi are essential components of the respiratory system, facilitating air passage to the lungs, protecting the respiratory tract from pathogens and debris, and regulating airflow. Their structure, lined with cartilage, smooth muscle, and ciliated epithelium, enables them to perform these functions effectively.


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