anatomy clinical anatomy nerve supply contents boundaries blood supply head and neck boundaries and contents infratemporal fossa temporal fossa situation parotid gland attachments omohyoid muscle thyrohyoid muscle sternothyroid muscle sternohyoid muscle infrahyoid muscle muscles distribution formation ansa cervicalis external carotid artery branches common carotid artery carotid triangle muscular triangle submental triangle submandibular triangle digastric triangle anterior triangle of neck lateral pharyngeal space retropharyngeal space pharyngeal spaces action nervesupply insertion origin sternocleidomastoid muscle posterior triangle prevertebral layer pretracheal layer investing layer deep cervical fascia lacrimal apparatus eyelids face layers scalp
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