Cricothyroid: Origins, Insertions, Innervation And Action

Cricothyroid: Origins, Insertions, Innervation And Action

List the origin, insertion, nerve supply, actions and applied anatomy of cricothyroid muscle.
Answer.

Cricothyroid Muscle Origin

Anterolateral part of the arch of cricoid cartilage.

Cricothyroid Muscle Insertion

Inferior cornu and adjoining part of the lower border of thyroid cartilage.

Cricothyroid Muscle Nerve supply

External laryngeal nerve.

Cricothyroid Muscle Actions

It lengthens and tenses vocal cords by tilting the thyroid cartilage forwards. It also causes adduction of vocal cords.

Cricothyroid Muscle Applied anatomy

The cricothyroid muscle is an important muscle for pitch and tone of voice. Hence, its paralysis may alter the voice significantly, which is noticeable especially in singers.