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CAROTID SHEATH-LOWER PART

Anatomy-Neck

CAROTID SHEATH-LOWER PART

1. The lower part of the carotid sheath extends proximally from the bifurcation of the CCA into the ECA and ICA (at the tip of the greater horn of the hyoid) at C3 - to the sternoclavicular joint.
2. Contains the CCA (medial), IJV (lateral), vagus n. (behind) and ansa cervicalis (superficial to IJV).
3. Its free posteriorly to slide over the prevertebral fascia, but adherent to the under-surface of the SCM.
4. The sheath is thin over the IJV, to allow it to dilate.
5. The dead space around the vein contains the inferior deep cervical LN.
6. The terminal portion of the CCA is dilated into a carotid sinus, which is continuous with the commencement of the ICA.

RELATIONS
7. Medial - pharynx, trachea.
8. Lateral/superficial - infrahyoid, SCM.
9. Posterior - cervical sympathetic trunk.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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