Muscle Innervations

Question 1

Innervation:

Middle pharyngeal constrictor

Answer 1

Pharyngeal branch of vagus & pharyngeal plexus, plus branches of external and recurrent laryngeal nerves (from CN X)

Question 1

Innervation:

Inferior pharyngeal constrictor

Answer 1

Pharyngeal branch of vagus & pharyngeal plexus, plus branches of external and recurrent laryngeal nerves (from CN X)

Question 1

Innervation:

Stylopharyngeus muscle

Answer 1

Glossopharyngeal nerve (CN IX)

Question 3

Innervation:

Depressor anguli oris

Answer 3

Mandibular branch of facial nerve

Question 3

Innervation:

Medial pterygoid muscle

Answer 3

Nerve to the medial pterygoid (V3)

Question 4

Innervation:

Occipitofrontalis (both frontal & occipital bellies)

Answer 4

Facial nerve

Question 5

Innervation:

Orbicularis oris

Answer 5

Buccal branch of facial nerve

Question 5

Innervation:

Genioglossus

Answer 5

Hypoglossal nerve (CN XII)

Question 6

Innervation:

Mentalis

** It raises and pushes up the lower lip, causing wrinkling of the chin, as in doubt or displeasure. It is sometimes referred to as the “pouting muscle.”**

Answer 6

Mandibular branch of facial nerve

Question 8

Innervation:

Nasalis

Answer 8

Buccal branch of facial nerve

Question 8

Innervation:

Lateral pterygoid muscle

Answer 8

Nerve to the lateral pterygoid (V3)

Question 9

Innervation:

Cricothyroid

Answer 9

External laryngeal nerve (from CN X)

Question 10

Innervation:

Hypoglossus

Answer 10

Hypoglossal nerve (CN XII)

Question 11

Innervation:

Temporalis muscle

Answer 11

Deep temporal nerve (V3)

Question 13

Innervation:

Orbicularis oculi

Answer 13

Temporal and zygomatic branches of facial nerve

Question 14

Innervation:

Platysma

Answer 14

Cervical branch of facial nerve

Question 15

Innervation:

Vocalis

Answer 15

Inferior laryngeal nerve (terminal part of recurrent laryngeal nerve, from CN X)

Question 16

Innervation:

Digastric, anterior belly

Answer 16

Mylohyoid nerve (from inferior alveolar —> V3)

Question 17

Innervation:

Levator labii superioris alaeque nasi

**Causes you to snarl. Nicknamed the Elvis Muscle. translated from Latin, the “lifter of both the upper lip and of the wing of the nose”. It has the longest name of any muscle in an animal.**

Answer 17

Buccal branch of facial nerve

Question 18

Innervation:

Geniohyoid muscle

Answer 18

C1 coursing with hypoglossal nerve (CN XII)

Question 19

Innervation:

Zygomaticus major

Answer 19

Zygomatic and buccal branches of facial nerve

Question 21

Innervation:

Buccinator

Answer 21

Buccal branch of facial nerve

Question 22

Innervation:

Mylohyoid muscle

Answer 22

Nerve to mylohyoid (branch of inferior alveolar nerve from V3)

Question 23

Innervation:

Superior pharyngeal constrictor

Answer 23

Pharyngeal branch of vagus & pharyngeal plexus

Question 24

Innervation:

Masseter

Answer 24

Masseteric nerve from trigeminal (CN V3 - madibular)

Question 25

Innervation:

Styloglossus

Answer 25

Hypoglossal nerve (CN XII)

Question 27

Innervation:

Digastric, posterior belly

Answer 27

Facial nerve

Question 28

Innervation:

Thryoarytenoid

Answer 28

Inferior laryngeal nerve (terminal part of recurrent laryngeal nerve, from CN X)

Question 29

Innervation:

Stapedius muscle

Answer 29

CN VII - facial

Question 30

Innervation:

Tensory tympani muscle

Answer 30

CN V3 - Mandibular nerve of trigeminal