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innervations Flashcards

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1
Q

Platysma innervation and action

A

Innervation: Cervical branch of Facial N.
A: Draws corners of mouth inferiorly, draws skin of the neck superiorly

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2
Q

Sternocleidomastoid muscle innervation and action

A

Innervation: Spinal accessory nerve (CN XI, motor)
Action: Unilateral contraction = ipsilateral lateral flexion & contralateral rotation
Bilateral contraction = cervical flexion

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3
Q

Trapezius muscle innervation and action

A

Innervation: Spinal accessory nerve (CN XI; motor)
A: Elevates, retracts, and rotates scapulae superiorly
Descending (superior) fibers: elevate scapulae/shoulders; maintain level of shoulders against gravity or
resistance

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4
Q
  • Sternohyoid Muscle innervation and action
A

Innervated by Ansa Cervicalis (C1-C3)
Depresses hyoid after elevation during swallowing

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5
Q
  • Superior Belly of Omohyoid muscle innervation and action
A

Innervated by: Ansa Cervicalis (C1-C3)
Depresses, retracts, and steadies hyoid
Inferior belly attaches to scapula and is in the posterior triangle of neck

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6
Q

Sternothyroid muscle innervation and action

A

Innervation Ansa Cervicalis (C2-C3)
Depresses hyoid and larynx

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7
Q

Thyrohyoid muscle innervation and action

A

Innervated by nerve to thyrohyoid (C1)
Depresses hyoid and elevates larynx

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8
Q

Mylohyoid innervation and action

A

Innervation: Nerve to mylohyoid, a branch of inferior alveolar nerve (from mandibular nerve, CN V3)
A: Elevates hyoid, floor of mouth, and tongue during swallowing and speaking

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9
Q

Geniohyoid innervation and action

A

Innervation: nerve to geniohyoid (C1)
A: Pulls hyoid anterosuperiorly; shortens floor of mouth; widens pharynx

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10
Q

Stylohyoid innervation and action

A

Innervated by: Facial nerve (CN VII), Stylohyoid (preparotid) branch of Facial Nerve
A: Elevates and retracts hyoid, elongating floor of mouth

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11
Q

Digastric innervation and action

A

Anterior belly innervation: Nerve to mylohyoid, a branch of inferior alveolar nerve from mandibular
division of the Trigeminal nerve (CN V3)
Posterior belly innervation: Facial nerve (CN VII), Digastric (preparotid) branch of Facial Nerve
A: Working with infrahyoid muscles, depresses mandible against resistance; elevates and steadies hyoid
during swallowing and speaking

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12
Q

longus colli innervation and action

A

c2-6
neck flexion, rotate face away, laterally flex neck

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13
Q

longus capitis innervation and action

A

c1-c3
flex head

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14
Q

rectus capitis anterior innervation and action

A

c1-c2
flex head

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15
Q

rectus capitis lateralis innervation and action

A

c1-c2
laterally flex head

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16
Q

anterior scalene innervation and action

A

c4-c6
elevate 1st rib, laterally flex neck, flex neck, rotate face away

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17
Q

middel scalene innervation and action

A

c3-c8
elevate 1st rib, laterally flex neck

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18
Q

posterior scalene

A

c6-c8
elevate 2nd rib, laterally flex neck

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19
Q

What is the action and innervation of the Platysma?

A

Action: Depresses the mandible, tenses skin of the neck.
Innervation: Cervical branch of the facial nerve (CN VII).

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20
Q

What is the action and innervation of the Trapezius?

A

Action: Elevates, retracts, and rotates scapula; lower fibers depress scapula

Innervation: Accessory nerve (CN XI) and cervical spinal nerves C3 and C4

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21
Q

What is the action and innervation of the Sternocleidomastoid ?

A

Action: Flexes and laterally rotates head; aids in forced inspiration
Innervation: Accessory nerve (CN XI), cervical nerves C2 and C3

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22
Q

What is the action and innervation of the Sternohyoid?

A

Action: Depresses hyoid after swallowing
Innervation: Ansa cervicalis (C1-C3)

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23
Q

What is the action and innervation of the Sternothyroid?

A

Action: Depresses thyroid cartilage
Innervation: Ansa cervicalis (C1-C3)

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24
Q

What is the action and innervation of the Thyrohyoid?

A

Action: Depresses hyoid and elevates larynx
Innervation: C1 via hypoglossal nerve (CN XII)

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25
What is the action and innervation of the Cricothyroid?
Action: Tenses and elongates vocal cords Innervation: External branch of the superior laryngeal nerve (CN X)
26
What is the action and innervation of the Superior belly of Omohyoid?
Action: Depresses hyoid bone Innervation: Ansa cervicalis (C1-C3)
27
What is the action and innervation of the Inferior belly of Omohyoid?
Action: Depresses hyoid bone Innervation: Ansa cervicalis (C1-C3)
28
What is the action and innervation of the Anterior belly of Digastric?
Action: Elevates hyoid and assists in opening mandible Innervation: Mylohyoid nerve (branch of CN V3)
29
What is the action and innervation of the Posterior belly of Digastric?
Action: Elevates hyoid and assists in opening mandible Innervation: Facial nerve (CN VII)
30
What is the action and innervation of the Stylohyoid?
Action: Elevates and retracts hyoid Innervation: Facial nerve (CN VII)
31
What is the action and innervation of the Mylohyoid?
Action: Elevates hyoid and floor of mouth Innervation: Mylohyoid nerve (branch of CN V3)
32
What is the action and innervation of the Geniohyoid?
Action: Pulls hyoid bone anterosuperiorly Innervation: C1 via hypoglossal nerve (CN XII)
33
What is the action and innervation of the Anterior Scalene?
Action: Elevates the first rib; laterally flexes and rotates neck Innervation: Cervical spinal nerves C4-C6
34
What is the action and innervation of the Middle Scalene?
Action: Elevates the first rib; laterally flexes neck Innervation: Cervical spinal nerves C3-C8
35
What is the action and innervation of the Posterior Scalene?
Action: Elevates the second rib; laterally flexes neck Innervation: Cervical spinal nerves C6-C8
36
What is the action and innervation of the Longus Capitis?
Action: Flexes head and neck Innervation: Cervical spinal nerves C1-C3
37
What is the action and innervation of the Longus Colli?
Action: Flexes neck; assists in lateral flexion and rotation Innervation: Cervical spinal nerves C2-C6
38
What is the action and innervation of the Superior Pharyngeal Constrictor?
Action: Constricts pharyngeal walls during swallowing Innervation: Pharyngeal branch of vagus nerve (CN X)
39
What is the action and innervation of the Middle Pharyngeal Constrictor?
Action: Constricts pharyngeal walls during swallowing Innervation: Pharyngeal branch of vagus nerve (CN X)
40
What is the action and innervation of the Inferior Pharyngeal Constrictor?
Action: Constricts pharyngeal walls during swallowing Innervation: Pharyngeal branch of vagus nerve (CN X)
41
What is the action and innervation of the Occipitofrontalis?
Action: Raises eyebrows and wrinkles forehead Innervation: Facial nerve (CN VII)
42
What is the action and innervation of the Orbicularis Oculi?
Action: Closes eyelids Innervation: Facial nerve (CN VII)
43
What is the action and innervation of the Orbicularis Oris?
Action: Compresses and protrudes lips Innervation: Facial nerve (CN VII)
44
What is the action and innervation of the Zygomaticus Major?
Action: Elevates corner of mouth (smiling) Innervation: Facial nerve (CN VII)
45
What is the action and innervation of the Zygomaticus Minor?
Action: Elevates upper lip Innervation: Facial nerve (CN VII)
46
What is the action and innervation of the Depressor Labii Inferioris?
Action: Depresses lower lip Innervation: Facial nerve (CN VII)
47
What is the action and innervation of the Depressor Anguli Oris?
Action: Depresses corner of mouth (frowning) Innervation: Facial nerve (CN VII)
48
What is the action and innervation of the Mentalis?
Action: Elevates and protrudes lower lip Innervation: Facial nerve (CN VII)
49
What is the action and innervation of the Levator Labii Superioris?
Action: Elevates upper lip Innervation: Facial nerve (CN VII)
50
What is the action and innervation of the Levator Anguli Oris?
Action: Elevates corner of mouth Innervation: Facial nerve (CN VII)
51
What is the action and innervation of the Buccinator?
Action: Compresses cheek, holds food between teeth Innervation: Facial nerve (CN VII)
52
What is the action and innervation of the Masseter?
Action: Elevates and protrudes mandible Innervation: Mandibular nerve (CN V3)
53
What is the action and innervation of the Temporalis?
Action: Elevates and retracts mandible Innervation: Mandibular nerve (CN V3)
54
What is the action and innervation of the Lateral Pterygoid?
Action: Protracts mandible, aids in lateral movements Innervation: Mandibular nerve (CN V3)
55
What is the action and innervation of the Medial Pterygoid?
Action: Elevates mandible, aids in lateral movements Innervation: Mandibular nerve (CN V3)
56
What is the action and innervation of the Levator Palpebrae Superioris?
Action: Elevates upper eyelid Innervation: Oculomotor nerve (CN III)
57
What is the action and innervation of the Superior Oblique?
Action: Depresses, abducts, and internally rotates eyeball Innervation: Trochlear nerve (CN IV)
58
What is the action and innervation of the Superior Rectus?
Action: Elevates, adducts, and internally rotates eyeball Innervation: Oculomotor nerve (CN III)
59
What is the action and innervation of the Lateral Rectus?
Action: Abducts eyeball Innervation: Abducens nerve (CN VI)
60
What is the action and innervation of the Medial Rectus?
Action: Adducts eyeball Innervation: Oculomotor nerve (CN III)
61
What is the action and innervation of the Inferior Rectus?
Action: Depresses, adducts, and externally rotates eyeball Innervation: Oculomotor nerve (CN III)
62
What is the action and innervation of the Inferior Oblique?
Action: Elevates, abducts, and externally rotates eyeball Innervation: Oculomotor nerve (CN III)
63
What is the action and innervation of the Levator Veli Palatini?
Action: Elevates soft palate during swallowing Innervation: Pharyngeal plexus of vagus nerve (CN X)
64
What is the action and innervation of the Tensor Veli Palatini?
Action: Tenses soft palate, opens auditory tube Innervation: Mandibular nerve (CN V3)
65
What is the action and innervation of the Salpingopharyngeus?
Action: Elevates pharynx and larynx during swallowing Innervation: Pharyngeal plexus of vagus nerve (CN X)
66
What is the significance of the Salpingopharyngeal Fold?
mucosal fold covering the Salpingopharyngeus muscle; assists in equalizing pressure in the middle ear
67
What is the action and innervation of the Stylopharyngeus?
Action: Elevates pharynx and larynx during swallowing Innervation: Glossopharyngeal nerve (CN IX)
68
What is the action and innervation of the Palatoglossus?
Action: Elevates posterior tongue, brings soft palate towards tongue Innervation: Pharyngeal plexus of vagus nerve (CN X)
69
What is the significance of the Palatoglossal Fold?
Mucosal fold containing the Palatoglossus muscle, forms the boundary of the oral cavity and oropharynx
70
What is the action and innervation of the Palatopharyngeus?
Action: Elevates pharynx and narrows oropharyngeal isthmus Innervation: Pharyngeal plexus of vagus nerve (CN X)
71
What is the significance of the Palatopharyngeal Fold?
Significance: Mucosal fold covering the Palatopharyngeus muscle; plays a role in pharyngeal closure during swallowing
72
What is the action and innervation of the Genioglossus?
Action: Protrudes and depresses tongue Innervation: Hypoglossal nerve (CN XII)
73
What is the action and innervation of the Styloglossus?
Action: Retracts and elevates tongue Innervation: Hypoglossal nerve (CN XII)
74
What is the action and innervation of the Hyoglossus?
Action: Depresses and retracts tongue Innervation: Hypoglossal nerve (CN XII)

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