Definitions

1. noun

a small muscle, especially one of the small muscles that make up a larger muscle group.

“The musculus flexor pollicis longus is responsible for flexing the thumb.”

2. noun

a small muscle in the eye that controls the shape of the pupil.

“The musculus dilator pupillae is responsible for dilating the pupil in low light conditions.”

3. noun

a small muscle in the ear.

“The musculus tensor tympani helps regulate the movement of the eardrum.”