Which of the following is not a part of the carotid sheath -(84-85-BDC-3) 6th Edition

(D) (Cervical plexus) (84-85-BDC-3) 6th EditionCarotid sheath* Carotid sheath is a local consideration of the prevertebral, the pretracheal, and the investing layers of the deep fascia.* Contents -a) Common and internal carotid artery.b) Internal jugular vein.c) Vagus nerve.d) Deep cervical lymph nodes.* Relations -1) The ansa cervicalis lies embedded in the anterior wall of the carotid sheath.2) The cervical sympathetic chain lies behind the sheath, plastered to the prevertebral fascia.3) The sheath is overlapped by the anterior border of the sternocleidomastoid and is fused to the layers of the deep cervical fascia.* At the level of the upper border of the thyroid cartilage, the common carotid artery bifurcates into the internal and external carotid arteries. The pulsations of these arteries can be felt at this level.