anterior neck triangle

Question 1

borders of anterior triangle

Answer 1

inferior border of mandible
anterior border of SCM
midline of neck

Question 2

subdivisions of anterior triangle

Answer 2

submandibular
submental
carotid
muscular

Question 3

contents of carotid sheath

Answer 3

common carotid artery
internal carotid artery
external carotid artery
internal jugular vein
CN X

Question 4

suprahyoid muscles

Answer 4

mylohyoid
digastric
stylohyoid
geniohyoid

Question 5

infrahyoid muscles

Answer 5

sternohyoid
omohyoid
thyrohoid
sternothyroid

Question 6

what do suprahyoid muscles do

Answer 6

raise the hyoid bone when swallowing

Question 7

what do infrahyoid muscles do

Answer 7

depress or fix hyoid bone and provide attachments of suprahyoid muscles

Question 8

mylohyoid origin, insertion, action and innnervation

Answer 8

origin: mylohyoid line on mandible
insertion: body of hyoid and fibres of opposite mylohyoid
action: elevates the hyoid and forms the floor of oral cavity
insertion: nerve to mylohyoid CN V3

Question 9

digastric origin, insertion, action and innnervation

Answer 9

origin: anterior at digastric fossa on mandible, posterior mastoid notch on mastoid process
insertion: attachment of intermediate tendon at hyoid
action: anterior raises hyoid and opens mouth by lowering mandible, posterior elevates and retracts hyoid bone
innervation: anterior nerve to mylohyoid CN V3, posterior CN VII digastric branch

Question 10

stylohyoid origin, insertion, action and innnervation

Answer 10

origin: styloid process
insertion: body of hyoid
action: pulls hyoid bone upward
innervation: CN VII

Question 11

geniohyoid origin, insertion, action and innnervation

Answer 11

origin: mandible
insertion: body of hyoid superior to mylohyoid floor of oral cavity
action: fixed mandible - elevates and pulls hyoid forward, fixed hyoid - pulls downward and inward
innervation: anterior ramus of C1run with CN XII

Question 12

sternohyoid origin, insertion, action and innnervation

Answer 12

origin: sternoclavicular joint
insertion: hyoid medially
action: depresses hyoid after elevation during swallowing
innervation: anterior rami of C1 to C3 through ansa cervicalis

Question 13

omohyoid origin, insertion, action and innnervation

Answer 13

origin: superior - intermediate tendon, inferior - superior border of scapula
insertion: superior - hyoid laterally, inferior - intermediate tendon
action: depresses and fixes the hyoid
innervation: anterior rami of C1 to C3 through ansa cervicalis

Question 14

thyrohoid origin, insertion, action and innnervation

Answer 14

origin: thyroid cartilage
insertion: greater horn and adjacent body of hyoid
action: depresses hyoid, can raise larynx when hyoid is fixed
innervation: anterior rami of C1 run with CN XII

Question 15

sternothyroid origin, insertion, action and innnervation

Answer 15

origin: manubrium
insertion: olbique line of thyroid cartilage
action: draws larynx downward
innervation: anterior rami of C1 to C3 through ansa cervicalis