Neck and Larynx Muscles

Question 1

What does the Trapezius Muscle do? What innervates it?

Answer 1

Extends neck bilaterally, laterally flexes neck and rotates face away Spinal Accessory Nerve

Question 2

What does the Sternocleidomastoid Muscle do? What innervates it?

Answer 2

Extends and flexes neck, laterally flexes neck and rotates face away Spinal Accessory Nerve

Question 3

What does the Anterior Scalene Muscle do? What innervates it?

Answer 3

Flexes neck and elevates first rib Anterior Rami C3-C6

Question 4

What does the Middle Scalene Muscle do? What innervates it?

Answer 4

Flexes neck and elevates first rib Anterior Rami C2-C7

Question 5

What does the Posterior Scalene Muscle do? What innervates it?

Answer 5

Laterally flexes neck and elevates second rib Anterior Rami C5-C7

Question 6

What does the Mylohyoid Muscle do? What innervates it?

Answer 6

Elevates hyoid bone, floor of mouth and tongue

Nerve to Mylohyoid

Question 7

What does the Geniohyoid Muscle do? What innervates it?

Answer 7

Elevates hyoid bone, shortens floor of mouth, widens pharynx

C1 via hypoglossal nerve

Question 8

What does the Digastric Muscle do? What innervates it?

Answer 8

Elevates and steadies hyoid bone, depresses mandible Anterior Belly: Nerve to Mylohyoid Posterior Belly: Facial Nerve

Question 9

What does the Stylohyoid Muscle do? What innervates it?

Answer 9

Elevates and retracts hyoid bone, elongates floor of mouth Facial Nerve

Question 10

What does the Sternohyoid Muscle do? What innervates it?

Answer 10

Depresses Hyoid Bone Ansa Cervicalis (C1-C3)

Question 11

What does the Sternothyroid Muscle do? What innervates it?

Answer 11

Depresses thyroid cartilage Ansa Cervicalis (C2-C3)

Question 12

What does the Thyrohyoid Muscle do? What innervates it?

Answer 12

Depresses Hyoid Bone and elevates thyroid cartilage C1 via hypoglossal nerve

Question 13

What does the Omohyoid Muscle do? What innervates it?

Answer 13

Depresses and retracts hyoid bone Ansa Cervicalis (C1-C3)

Question 14

What does the Platysma Muscle do? What innervates it?

Answer 14

Draw corner of mouth inferiorly and draws skin of neck superiorly Cervical Branch of Facial Nerve

Question 15

What does the Cricothyroid Muscle do? What innervates it?

Answer 15

Stretches and tenses vocal ligament (high notes) External Laryngeal Nerve (External Branch of Superior Laryngeal Nerve)

Question 16

What does the Thyroarytenoid Muscle do? What innervates it?

Answer 16

Relaxes vocal fold Recurrent Laryngeal Nerve

Question 17

What does the Longus Capitus Muscle do? What innervates it?

Answer 17

Flexes neck Anterior Rami (C1-C3)

Question 18

What does the Posterior Cricoarythenoid Muscle do? What innervates it?

Answer 18

Abducts vocal fold

Recurrent laryngeal N.