Neck triangles

Question 1

Carotid sheath contents

Answer 1

• common carotid artery
• internal carotid artery
• external carotid artery
• internal jugular vein
• CN X (vagus)

Question 2

suprahyoid muscles

Answer 2

• digastric
• mylohyoid
• geniohyoid
• stylohyoid

Question 3

infrahyoid muscles

Answer 3

• sternohyoid
• thyrohyoid
• omohyoid
• sternothyroid

Question 4

suprahyoid muscles - function

Answer 4

elevate hyoid bone during swallowing

Question 5

mylohyoid function

Answer 5

• elevates hyoid bone
• forms floor of oral cavity

Question 6

mylohyoid muscle nerve innervation

Answer 6

• CN V3
• nerve to mylohyoid

Question 7

digastric muscle nerve innervation

Answer 7

• anterior belly - nerve to mylohyoid
• posterior belly - digastric branch of facial nerve

Question 8

geniohyoid location

Answer 8

superior to mylohyoid

Question 9

infra hyoid ‘strap’ muscles - function

Answer 9

• depress or fix hyoid bone
• provide attachment for suprahyoid muscles

Question 10

strap muscles innervation (doesn’t include thyrohyoid)

Answer 10

• anterior rami of C1 to C3 via ansa cervicalis

Question 11

External carotid artery branches

Answer 11

• superior thyroid
• ascending pharyngeal
• occipital
• lingual
• facial
• posterior auricular
• superficial temporal
• maxillary

Question 12

Sternocleidomastoid muscle nerve innervation

Answer 12

Spinal accessory nerve CN XI

Question 13

thyrohyoid innervation

Answer 13

anterior rami of C1, carried within hypoglossal nerve