Axillary sheath is an extension of-: (A) Pretracheal fascia, (B) Prevertebral layer of deep cervical fascia, (C) Investing layer of deep cervical fascia, (D) None
Answer is B. Ans. is 'b' i.e., Prevertebral layer of deep cervical fascia 'Axillary sheath and fascia around trunk of brachial plexus are derived from prevertebral fascia (prevertebral layer of deep cervical fascia).'