 Then, the dissection continued medial to the sternocleidomastoid muscle and then medial to the carotid artery to the prevertebral fascia, which was gently dissected and released superiorly and inferiorly. 
Then , the dissection continued medial to the sternocleidomastoid muscle and then medial to the carotid artery to the prevertebral fascia , which was gently dissected and released superiorly and inferiorly .