Anterior Triangle Muscles

Question 1

Digastric (ant. & post. bellies) origin

Answer 1

mastoid process

Question 2

Digastric (ant. And post. bellies) insertion

Answer 2

digastric fossa

Question 3

Digastric (ant. and post. bellies) innervation

Answer 3

Posterior = CN VII (facial)
Anterior = CN V (trigeminal)
**different CN bc they derive from differnt arches (mandibular and hyoid arch)

Question 4

Digastric (ant. and post. bellies) action

Answer 4

Elevates hyoid; depresses mandible

Question 5

All of the suprahyoid muscles have what action?

Answer 5

elevate the hyoid

Question 6

Mylohyoid origin

Answer 6

Mylohyoid line inside of mandible

Question 7

Mylohyoid insertion

Answer 7

midline raphe; hyoid

*big sheet of muscles that meets at midline and attaches along hyoid

Question 8

Mylohyoid Innervation

Answer 8

CN V aka trigeminal

Question 9

Mylohyoid Action

Answer 9

Elevates hyoid; elevates floor of oral cavity

Question 10

Stylohyoid origin

Answer 10

Styloid process

Question 11

Stylohyoid insertion

Answer 11

hyoid (splits around the sling of digastirc)

Question 12

Stylohyoid innervation

Answer 12

CN VII aka facial nerve

Question 13

Stylohyoid action

Answer 13

Elevates and retracts hyoid

Question 14

Both Stylohyoid and _________ are next to each other? innervated by?

Answer 14

posterior belly of digastric

**CN VII aka facial nerve

Question 15

mylohyod and _________ are innervatied by?

Answer 15

anterior belly of digastric

*CN V aka trigeminal

Question 16

Geniohyoid origin

Answer 16

Genial tubercles on mandible

Question 17

Geniohyoid insertion

Answer 17

hyoid

Question 18

Geniohyoid innervation

Answer 18

C1 ventral rami

Question 19

Geniohyoid action

Answer 19

Elevates hyoid; Helps protrude tongue

Question 20

name the 4 suprhyoid muscles?

Answer 20

Digastric (ant. And post. bellies)
Mylohyoid
Stylohyoid
Geniohyoid

Question 21

Omohyoid (superior and inferior bellies) origin

Answer 21

Hyoid

Question 22

Omohyoid (superior & inferior bellies) insertion

Answer 22

superior scapula -goes deep to trapezius and inserts on scapula

Question 23

Omohyoid (superior & inferior bellies) innervation

Answer 23

ansa cervicalis

*part of the motor part of cervical plexus

Question 24

Omohyoid (superior and inferior bellies) action

Answer 24

Depresses the hyoid

Question 25

All infrehyoid muscles? This is opposite of?

Answer 25

infrahyoid muscles= depress hyoid

*opposite of suprahyoid muscles= elevate hyoid

Question 26

Sternohyoid is found next to?

Answer 26

next to superior belly of omhyoid

Question 27

Sternohyoid origin

Answer 27

Manubrium of sternum

Question 28

Sternohyoid insertion

Answer 28

hyoid

Question 29

Sternohyoid innervation

Answer 29

ansa cervicalis

Question 30

Sternohyoid action

Answer 30

Depresses the hyoid

Question 31

Thyrohyoid origin

Answer 31

Thyroid cartilage

Question 32

Thyrohyoid insertion

Answer 32

hyoid

Question 33

Thyrohyoid innervation

Answer 33

C1 ventral rami

Question 34

Thyrohyoid action

Answer 34

Depresses the hyoid

Question 35

Sternothyroid origin

Answer 35

Manubrium of Sternothyroid sternum

Question 36

Sternothyroid insertion

Answer 36

thyroid cartilage

Question 37

Sternothyroid action

Answer 37

Depresses the larynx*

Question 38

Sternothyroid innervation

Answer 38

ansa cervicalis

Question 39

What two muscles are innervated by C1 ventral rami?

Answer 39

Thyrohyoid and Geniohyoid

Question 40

Name the infrahyois Muscles?

Answer 40

Omohyoid (superior and inferior bellies)
Sternohyoid
Thyrohyoid
Sternothyroid