Carotid sheath

Carotid Sheath

The Carotid Sheath (/kəˈrɒtɪd ʃiːθ/) is a vital anatomical structure in the neck that encloses the carotid artery, internal jugular vein, and the vagus nerve.

Etymology

The term "Carotid" is derived from the Greek word "karōtides" meaning "to stupefy" or "to plunge into deep sleep", as pressure on these arteries was believed to cause unconsciousness. The term "Sheath" comes from the Old English "sceath", meaning a protective covering or case.

Anatomy

The Carotid Sheath is a dense fibrous layer of connective tissue that extends from the base of the skull to the first rib and sternum. It is part of the deep cervical fascia of the neck.

Inside the Carotid Sheath, from lateral to medial are: the internal jugular vein, the vagus nerve, and the common carotid artery. The ansa cervicalis is embedded in the anterior wall of sheath.

Clinical Significance

The Carotid Sheath is clinically significant as it is often involved in neck infections, surgeries, and traumas. It is also a landmark for the administration of anesthesia in the neck region.

Related Terms

• Carotid artery
• Internal jugular vein
• Vagus nerve
• Deep cervical fascia
• Ansa cervicalis

External links

• Medical encyclopedia article on Carotid sheath
• Wikipedia's article - Carotid sheath

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