Midclavicular line

Midclavicular line is an anatomical term used to describe a vertical line used in anatomical imaging and physical examination that runs through the middle of the clavicle (collarbone) on each side of the human body. It is one of several anatomical lines used to systematically examine the chest and abdomen.

Definition

The midclavicular line is defined as a line drawn vertically through the midpoint of the clavicle, parallel to the median plane. It is used as a reference point in both physical examination and in radiological imaging to localize abnormalities more precisely within the chest and abdomen.

Clinical Significance

The midclavicular line is often used in the assessment of heart sounds, as the apex beat is typically located in the fifth intercostal space at the midclavicular line. It is also used as a landmark for safe surgical and diagnostic procedures, such as thoracentesis and pericardiocentesis, to avoid injury to underlying structures.

Related Terms

Other anatomical lines used in conjunction with the midclavicular line include the midaxillary line, which runs vertically down the middle of the axilla (armpit), and the midsternal line, which runs vertically down the middle of the sternum (breastbone).

See Also

• Anatomical terms of location
• Clavicle
• Midaxillary line
• Midsternal line

References

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