<prompt> Different layers of deep cervical fascia is marked in the cross section. Which of the following statement is true?Axillary sheath is derived from BParotid sheath is derived from CC represents Pretracheal fasicaC covers trapezius and sternocleidomastoid  <response>: A - PREVEEBRAL LAYER, B - INVESTING LAYER. C - PRETRACHEAL LAYER Axillary sheath develops from Preveebral layer A Carotid sheath is derived from contribution by all layers of deep cervical fascia. Parotid sheath is derived from investing layer. Thyroid sheath is derived from pretracheal layer. Investing layer covers trapezius and sternomastoid. 