Unit I Triangles of the Neck

Question 1

The SCM, when viewed laterally, divides these two triangles

Answer 1

the anterior and posterior triangles

Question 2

The anterior boundary of the posterior triangle is

Answer 2

the posterior border of the SCM

Question 3

the posterior boundary of the posterior triangle is

Answer 3

the anterior border of the trapezius

Question 4

The inferior boundary of the inferior triangle is

Answer 4

the superior border of the middle 1/3 of the clavicle

Question 5

The superior boundary of the anterior triangle is

Answer 5

the inferior border of the mandible

Question 6

The anterior border of the anterior triangle is

Answer 6

the anterior midline

Question 7

The posterior border of the anterior triangle is

Answer 7

the anterior border of the SCM

Question 8

List the subdivisions of the anterior triangle

Answer 8

submental, submandibular (digastric), carotid, and muscular triangles

Question 9

What is the only unpaired triangle of the subdivisions of the anterior traingle?

Answer 9

the submental triangle

Question 10

List the boundaries of the submental triangle

Answer 10

left and right anterior bellies of the digastric, and the body of the hyoid

Question 11

What is the floor of the submental triangle?

Answer 11

the mylohyoid muscle

Question 12

What is contained in the submental triangle?

Answer 12

minor veins and lymph nodes

Question 13

What are the boundaries of the submandibular triangle?

Answer 13

inferior border of mandible, anterior belly of the digastric, and the posterior belly of the digastric

Question 14

What is the floor of the submandibular triangle?

Answer 14

mylohyoid and hyoglossus muscles

Question 15

What is contained in the submandibular triangle?

Answer 15

the submandibular gland, internal carotid artery, facial artery, internal jugular vein, glossopharyngeal nerve (CN IX), and vagus nerve (CN X)

Question 16

What are the boundaries of the carotid triangle?

Answer 16

the posterior belly of digastric, superior belly of omohyoid, and anterior border of the SCM

Question 17

What makes the floor of the carotid triangle?

Answer 17

portions of the thyrohyoid, hyoglossus, and inferior and middle contrictor muscles

Question 18

What is contained within the carotid triangle?

Answer 18

parts of the common and internal carotid arteries, the external carotid artery and three of its branches, and tributaries of the internal jugular vein.

Question 19

What are the three branches of the external carotid artery included within the cartoid traingle?

Answer 19

superior thryroid artery, lingual artery, and facial artery

Question 20

What are the boundaries of the muscular triangle?

Answer 20

superior belly of omohyoid, anterior midline of the neck, and anterior border of the SCM

Question 21

What makes the floor of the muscular triangle?

Answer 21

posterior layer of the pretracheal fascia

Question 22

What is contained within the muscular triangle?

Answer 22

sternohyoid and sternothyroid muscles, thyroid gland, trachea, and esophagus

Question 23

What bone is often broken in strangulation cases of murder?

Answer 23

the hyoid bone

Question 24

Where is the hyoid located?

Answer 24

between the mandible and larynx

Question 25

What is the primary function of the infrahyoid muscle?

Answer 25

they move the hyoid and larynx

Question 26

List the infrahyoid muscles

Answer 26

omohyoid, sternohyoid, sternothyroid, and thyrohyoid

Question 27

What muscles make up the superficial layer of the infrahyoid muscles?

Answer 27

omohyoid and sternohyoid

Question 28

What muscles make up the deep layer of the infrahyoid muscles?

Answer 28

sternohyoid and sternothyroid

Question 29

What is the origin of the inferior belly of the omohyoid?

Answer 29

the upper border of the sacpula

Question 30

Where does the inferior belly of the omohyoid end?

Answer 30

an intermediate tendon deep to the SCM

Question 31

What is the origin of the superior belly of the omohyoid?

Answer 31

it extends upwards from the intermediate tendon where the inferior belly ends

Question 32

What is th insertion of the omohyoid?

Answer 32

body of the hyoid bone

Question 33

What is the innervation of the omohyoid?

Answer 33

the ansa cervicalis (C1-C3)

Question 34

Function of the omohyoid

Answer 34

depresses hyoid and larynx

Question 35

Origin of the sternohyoid

Answer 35

posterior surface of manubrium, and medial end of the clavicle

Question 36

Insertion of the sternohyoid

Answer 36

body of the hyoid

Question 37

Innervation of the sternohyoid

Answer 37

ansa cervicalis (C1-C3)

Question 38

Function of the sternohyoid

Answer 38

depresses hyoid and larynx

Question 39

Origin of the sternothyroid

Answer 39

posterior surface of manubrium, and inferior to origin of sternohyoid

Question 40

Insertion of sternothyroid

Answer 40

oblique line on lamina of thyroid cartilage

Question 41

Innervation of sternothyroid

Answer 41

ansa cervicalis (C1-C3)

Question 42

Function of sternothyroid

Answer 42

depresses the larynx

Question 43

Origin of thyrohyoid

Answer 43

oblique line on lamina of thyroid cartilage

Question 44

Insertion of thyrohyoid

Answer 44

body of hyoid

Question 45

Innervation of thyrohyoid

Answer 45

C1 through hypoglossal

Question 46

Function of thyrohyoid

Answer 46

depresses hyoid bone

Question 47

Why do we need the muscles to depress the hyoid and larynx?

Answer 47

Swallowing, talking, respiration, and if hyoid is fixed, the digastric depresses the mandible