Laryngeal Muscles : Mnemonics

Extrinsic muscles

Nerve supply: Ansa cervicalis (CN XII + C1, C2, C3)

Infrahyoid muscles (Depressors of larynx):

Mnemonic: TOSS

1. Thyrohyoid (Thyroid to hyoid)
2. Omohyoid (Suprascapular notch to hyoid)
3. Sternohyoid (Sternum to hyoid)
4. Sternothyroid (Sternum to thyroid)

Suprahyoid muscles (Elevators of larynx):

Mnemonic: MDGS

1. Mylohyoid (Mandible to hyoid)
2. Digastric (Mandible and Mastoid to hyoid)
3. Geniohyoid (Tongue to hyoid)
4. Stylohyoid (Styloid process to hyoid)

Intrinsic muscles

Muscles	Origin	Insertion	Function
Thyroepiglotticus	Thyroaryetenoid muscle	Epiglottis (lateral surface)	Opens laryngeal inlet
Aryepiglotticus	Oblique arytenoid muscle	Epiglottis	Closes laryngeal inlet
Posterior cricoarytenoid	Cricoid (posterior/lamina)	Arytenoid	Abductor of vocal cords
Lateral cricoarytenoid	Cricoid (lateral/arch)	Arytenoid	Adductor of vocal cords
Interarytenoid (Transverse and Oblique)	Arytenoid	Arytenoid	Adductor of vocal cords
Cricothyroid	Cricoid	Thyroid	Tensor of vocal cords
Thyroarytenoid/Vocalis	Thyroid	Arytenoid (Thyroarytenoid)/Vocal ligament (Vocalis)	Relaxor of vocal cords

Nerve supply:

Mnemonic: SCAR

1. Superior laryngeal nerve (External laryngeal nerve): Cricothyroid

2. All other muscles: Recurrent laryngeal nerve