Laryngeal Anatomy

Question 1

Intrinsic laryngeal muscles

Answer 1

thyroarytenoid & cricothyroid

Question 2

Thyroarytenoid

Answer 2

• makes up body of VFs, contraction shortens
• RLN innervation

Question 3

Cricothyroid

Answer 3

• contraction rocks cricoid back, raises pitch (stretches VFs)
• THE ONLY SLN innervated laryngeal muscle

Question 4

Vocal fold ADDuctors

Answer 4

lateral cricoarytenoids (LCA) & transverse & oblique interarytenoids (IAs)

Both innervated by RLN

Question 5

Vocal fold ABductors

Answer 5

posterior cricoarytenoid muscles (PCA)

Question 6

Extrinsic laryngeal muscles- Suprahyoids

Answer 6

Suprahyoids help with hyoid elevation, increasing pitch, and widening the pharynx and PES during swallowing.
- includes mylohyoid, stylohyoid, geniohyoid, and digastric muscles

Question 7

Extrinsic laryngeal muscles- Infrahyoids

Answer 7

Infrahyoids help with hyolaryngeal depression
- Includes sternohyoid, thyrohyoid, omohyoid, sternothyroid