OINA's 2 - Table 5.1 - Muscles of Ant Triangle

Question 1

Omohyoid - origin

Answer 1

Inferior belly: scapula

Superior belly: intermediate tendon

Question 2

Omohyoid - insertion

Answer 2

Inferior belly: intermediate tendon

Superior belly: body of hyoid bone

Question 3

Omohyoid - action

Answer 3

Depresses hyoid bone and larynx

Question 4

Omohyoid - nerve

Answer 4

Ansa cervicalis (APR of C1, C2, C3)

Question 5

Sternohyoid - origin

Answer 5

Manubrium of sternum

Question 6

Sternohyoid - insertion

Answer 6

Body of hyoid bone

Question 7

Sternohyoid - action

Answer 7

Depresses hyoid bone and larynx

Question 8

Sternohyoid - nerve

Answer 8

Ansa cervicalis (APR of C1, C2, C3)

Question 9

Sternothyroid - origin

Answer 9

Manubrium of sternum

Question 10

Sternothyroid - insertion

Answer 10

Thryoid cartilage

Question 11

Sternothyroid - action

Answer 11

Depresses larynx

Question 12

Sternothyroid - nerve

Answer 12

Ansa cervicalis (APR of C1, C2, C3)

Question 13

Thryohyoid - origin

Answer 13

Thyroid cartilage

Question 14

Thryohyoid - insertion

Answer 14

Body and greater horn of hyoid bone

Question 15

Thryohyoid - action

Answer 15

Depresses hyoid bone

Question 16

Thyrohyoid - nerve

Answer 16

Thyrohyoid branch of hypoglossal nerve (hitchhiking branches of APR of C1)

Question 17

Digastric (posterior belly) - origin

Answer 17

Temporal bone at base of skull

Question 18

Digastric (posterior belly) - insertion

Answer 18

Intermediate tendon, which passes through sling of fascia on greater horn of hyoid bone

Question 19

Digastric (posterior belly) - action

Answer 19

Raises hyoid bone

Question 20

Digastric (posterior belly) - nerve

Answer 20

Facial nerve (VII)

Question 21

Digastric (anterior belly) - origin

Answer 21

Intermediate tendon

Question 22

Digastric (anterior belly) - insertion

Answer 22

Digastric fossa of mandible

Question 23

Digastric (anterior belly) - action

Answer 23

Elevates hyoid bone

Question 24

Digastric (anterior belly) - nerve

Answer 24

Nerve to mylohyoid (cranial nerve V-3)

Question 25

Mylohyoid - origin

Answer 25

Mylohyoid line on medial aspect of mandibular body

Question 26

Mylohyoid - insertion

Answer 26

Median raphe and body of hyoid bone

Question 27

Mylohyoid - action

Answer 27

Elevates hyoid bone, base of tongue, and floor of mouth

Question 28

Mylohyoid - nerve

Answer 28

Nerve to mylohyoid (cranial nerve V-3)

Question 29

Geniohyoid - origin

Answer 29

Inferior genial tubercle of mandible

Question 30

Geniohyoid - insertion

Answer 30

Body of hyoid bone

Question 31

Geniohyoid - action

Answer 31

Elevates and protracts hyoid bone

Question 32

Geniohyoid - nerve

Answer 32

APR of C1

Question 33

Stylohyoid - origin

Answer 33

Styloid process

Question 34

Stylohyoid - insertion

Answer 34

Greater horn of hyoid bone

Question 35

Stylohyoid - action

Answer 35

Elevates hyoid bone

Question 36

Stylohyoid - nerve

Answer 36

Facial nerve (VII)