Anterior triangle

Question 1

Boundaries

Answer 1

Inferior border of mandible
Anterior border of sternocleidomastoid
Midline

Question 2

How is the anterior triangle further split?

Answer 2

Suprahyoid and infrahyoid

Question 3

Name the infrahyoid muscles

Answer 3

Omohyoid, sternothryoid, sternohyoid, thyrohyoid

Question 4

What innervates the infrahyoid muscles?

Answer 4

Ansa cervicalis except thyrohyoid which is innervated by C1 fibres hitchhiking along hypoglossal

Question 5

Name the suprahyoid muscles

Answer 5

Geniohyoid, mylohyoid, (anterior and posterior) digastric, stylohyoid

Question 6

Name the attachments of the suprahyoid muscles

Answer 6

Geniohyoid - inferior genial tubercle and body of hyoid
Mylohyoid - mylohyoid line of the mandible and body of hyoid
Digastric - anterior from digastric fossa of mandible, posterior from mastoid process
Stylohyoid - from styloid process of temporal to lateral aspect of hyoid

Question 7

What innervates the suprahyoid muscles?

Answer 7

Geniohyoid - C1 fibres hitch-hiking along hypoglossal
Mylohyoid - nerve to mylohyoid (branch of V3)
Anterior digastric - nerve to mylohyoid
Posterior digastric - facial nerve (through stylomastoid fo.)
Stylohyoid - facial nerve

Question 8

What VAN can be found in the anterior triangle?

Answer 8

Internal jugular vein, X, Common carotid artery - internal and external carotid artery

Question 9

Describe the branching of the external carotid artery in the neck

Answer 9

Superior thyroid a.
Lingual a. - to supply the tongue
Facial a.
Ascending pharyngeal a.
Occipital a.
Posterior auricular a. 
Terminal branches - superficial temporal and maxillary a

Question 10

Describe the branching of the vagus nerve in the neck

Answer 10

Superior laryngeal - internal and external laryngeal nerve

Pharyngeal

Question 11

What CN are found in anterior triangle?

Answer 11

X, XII

Question 12

Contents

Answer 12

X, XII
Br. of X = superior laryngeal (internal and external laryngeal), pharyngeal
Ansa cervicalis
Common carotid a.
Internal carotid a.
External carotid a. and its branches (superior thyroid, lingual, facial, ascending pharyngeal, occipital, posterior auricular)
Internal jugular vein.
Thyroid gland