Direction for the dissection of deep layer of neck Pharyngeal branch External carotid a Superior laryngeal nerve Superficial temporal a +At the level of upper border of posterity auricul al branch Facial a ror laryngeal nerve thyroid catilage, observe common occipital a External branch carotid a ext. int. carotid aa Ascending pharyngeal a superior laryngeal nerve Supenor thyroid a EXt carotid a.& its branches Thyrohyoid membrane Sup. thyroid a &V Common carotid a lingual a. deep to post. belly of - Cricothyroid m Vagus nerve digastric Int. ext branch of sup. laryngeal n Subclavian a Recurrent laryngeal the carotid sinus (a barometer) nerve Brachiocephalic trunk Branches of the ext carotid a& right vagus n in the neck
Direction for the dissection of deep layer of neck Branches of the ext.carotid a.& right vagus n.in the neck At the level of upper border of thyroid catilage,observe common carotid a.,ext. & int. carotid aa. Ext. carotid a. & its branches Sup.thyroid a.& v., lingual a.(deep to post.belly of digastric). Int.& ext branch of sup.laryngeal n. the carotid sinus (a barometer)
Deep layer of neck-muscular triangle Dissect muscular triangle-3 Cut the sternohyoid (1) at the level of cricoid cartilage Cut the sternothyroid(2)at the middle point ◆ Contents e Sup. belly of omohyoid ● Sternohyoid ● Sternothyroid Thyrohyoid ● Thyroid gland ● Parathyroid gland Cervical part of trachea esophagus
Dissect muscular triangle-3 Cut the sternohyoid (1) at the level of cricoid cartilage Cut the sternothyroid (2)at the middle point. Contents Sup.belly of omohyoid Sternohyoid Sternothyroid Thyrohyoid Thyroid gland Parathyroid gland Cervical part of trachea & esophagus Deep layer of neck‐muscular triangle 3 1 2 3