Tracheal tube divides into right and left bronchi at the level of :a)4th thoracic vertebrab)7th thoracic vertebrac)5th thoracic vertebrad)6ththoracic vertebraCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Trachea divides at the level of 5th thoracic vertebra into a right and left primary bronchi.

Answer

The trachea (windpipe) divides at the carina into two main or primary bronchi, the left bronchus and the right bronchus. The carina of the trachea is located at the level of the sternal angle and the fifth thoracic vertebra (at rest).

Answer

The correct answer is option 'C', the tracheal tube divides into right and left bronchi at the level of the 5th thoracic vertebra. Let's understand this in more detail.

Structure of the Tracheal Tube:
The tracheal tube, also known as the windpipe, is a flexible tube that connects the larynx (voice box) to the bronchi in the lungs. It is composed of hyaline cartilage rings that provide structural support and prevent collapse of the airway. The tracheal tube is located anterior to the esophagus and extends from the larynx to the level of the 5th thoracic vertebra.

Division of the Tracheal Tube:
At the level of the 5th thoracic vertebra, the tracheal tube divides into two main branches called the right and left main bronchi. This division occurs posterior to the manubriosternal joint, which is the joint connecting the sternum and the clavicle. The division of the tracheal tube into bronchi is known as the carina.

Right and Left Bronchi:
- Right Main Bronchus: The right main bronchus is wider, shorter, and more vertical than the left main bronchus. It enters the right lung and branches further into three secondary bronchi, supplying the superior, middle, and inferior lobes of the right lung.

- Left Main Bronchus: The left main bronchus is narrower, longer, and more horizontal than the right main bronchus. It enters the left lung and branches into two secondary bronchi, supplying the superior and inferior lobes of the left lung.

Importance of the Division:
The division of the tracheal tube into right and left bronchi allows for the distribution of air to both lungs. Each bronchus further divides into smaller bronchi, bronchioles, and eventually reaches the alveoli, where gas exchange occurs. This branching pattern ensures that air reaches all parts of the lungs, facilitating efficient oxygenation of blood and removal of carbon dioxide.

In conclusion, the tracheal tube divides into right and left bronchi at the level of the 5th thoracic vertebra. This division allows for the distribution of air to both lungs, ensuring effective respiratory function.

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