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What Level Is the Carina?

Published in Respiratory Anatomy 2 mins read

The carina is typically located at the level of the 4th to 5th thoracic vertebra.

Understanding the Carina's Level

The carina is a cartilaginous ridge located at the point where the trachea (windpipe) divides into the two main bronchi (airways leading to the lungs). Its anatomical position is significant in medical procedures and understanding respiratory anatomy.

Based on anatomical references:

  • The carina is found at the lower end of the trachea.
  • Its usual level corresponds to the 4th to 5th thoracic vertebra (T4-T5).
  • This location is generally aligned with the sternal angle (the joint between the manubrium and the body of the sternum).

Variability in Carina Position

While T4-T5 is the standard reference, the exact level of the carina can change:

  • Breathing: The carina may slightly raise or descend.
  • Range: This vertical movement can be up to two vertebral levels higher or lower depending on respiratory phase (inhalation or exhalation).
Aspect Description
Usual Level 4th to 5th thoracic vertebra (T4-T5)
Anatomical Landmark Aligned with the sternal angle
Positional Change Can move up or down with breathing
Range of Motion Up to two vertebral levels higher or lower

Understanding the usual level and its potential variation is important in imaging interpretation and bronchoscopy procedures.