Carotid Triangle

Question 1

Which artery ascends in this space?

Answer 1

Common carotid artery

Question 2

What are the boundaries?

Answer 2

Superior belly of omohyoid, posterior belly of digastric, anterior border of SCM.

Question 3

Which nerve supplies SCM?

Answer 3

CN XI

Question 4

Important landmark of this triangle?

Answer 4

Tip of Greater horn of hyoid

Question 5

Which nerve turns forward (toward tongue) just superior to tip of greater horn?

Answer 5

Hypoglossal nerve (CN XII)

Question 6

Which muscle is lateral to CN XII?

Answer 6

Posterior belly of digastric

Question 7

Which branch of which artery loops over CN XII deep to the digastric muscle?

Answer 7

Muscular branch of occipital artery

Question 8

Which is the only strap muscle not supplied by Ansa Cervacalis?

Answer 8

Thyrohyoid

Question 9

Geniohyoid is supplied by which nerve?

Answer 9

C1

Question 10

Ansa cervacalis supplied which muscles?

Answer 10

Strap muscles (except for thyrohyoid)

Question 11

Superior root of ansa cervacalis (mostly C1) separates from CN XII where?

Answer 11

Deep to digastric

Question 12

Inferior root of ansa cervacalis (C2, C3) does what?

Answer 12

Forms loop (ansa) to supply infrahyoid muscles

Question 13

What 4 things are found in carotid sheath?

Answer 13

IC 10 cc in the IV. Internal carotid artery, vagus nerve, common carotid artery, internal jugular vein

Question 14

Name laryngeal branches of vagus nerve

Answer 14

Superior laryngeal, internal laryngeal and external laryngeal nerve

Question 15

Where does superior laryngeal nerve branch from vagus?

Answer 15

Submandibular triangle. Send two branches in carotid triangle.

Question 16

Which of two superior laryngeal nerve branches is bigger?

Answer 16

Internal laryngeal nerve

Question 17

Where does internal laryngeal nerve appear is carotid triangle?

Answer 17

Just inferior to tip of greater horn of hyoid

Question 18

What does internal laryngeal nerve do?

Answer 18

Penetrates thyrohyoid membrane to supply sense to superior 1/2 of larynx

Question 19

Where does External Laryngeal nerve enter carotid triangle?

Answer 19

Posterior to internal laryngeal nerve and travels with superior thyroid artery (large)

Question 20

What does external laryngeal nerve provide?

Answer 20

Motor to cricothyroid muscle and inferior constrictor

Question 21

Which 3 fascias is carotid sheath derives from?

Answer 21

Prevertebral, pretracheal, investing fascia

Question 22

Name branches of Common Carotid Artery

Answer 22

NO COLLATERAL BRANCHES

Question 23

What happens to Common Carotid?

Answer 23

Bifurcates into internal and external carotid artery just INFERIOR TO TIP OF GREATER HORN OF HYOID

Question 24

What does internal carotid artery supply?

Answer 24

Brain and special senses

Question 25

Where does internal carotid enter skull?

Answer 25

Carotid canal at base of skull

Question 26

Name branches of internal carotid artery?

Answer 26

NO BRANCHES IN NECK!! 1st branch in skull

Question 27

Carotid body and sinus supplied by which nerve?

Answer 27

CN IX, X

Question 28

Carotid body is found...?

Answer 28

On medial surface of bifurcation of common carotid artery

Question 29

What does carotid body respond to?

Answer 29

Changes in O2, CO2 concentrations

Question 30

What type of receptor is carotid body?

Answer 30

Chemoreceptor

Question 31

Where is carotid sinus found?

Answer 31

Beginning of Internal Carotid and end of Common Carotid Artery

Question 32

What does carotid sinus respond to?

Answer 32

Pressure

Question 33

What type of receptor is carotid sinus?

Answer 33

Baroreceptor (pressure)

Question 34

What does external carotid artery supply?

Answer 34

Braincase and face

Question 35

Name branches of external carotid artery

Answer 35

Facial, occipital, lingual, ascending pharyngeal, superior thryoid, superior laryngeal

Question 36

What does internal jugular vein do?

Answer 36

Drains braincase and face

Question 37

Where does internal jugular vein exit skull?

Answer 37

Jugular foramen

Question 38

Which veins does internal jugular vein receive?

Answer 38

Occipital vein, common facial vein, lingual vein, superior thyroid vein, middle thyroid vein

Question 39

What does inferior thyroid vein empty into?

Answer 39

Brachiocephalic vein