The left side moved naturally as she made funny faces — but the right side barely twitched. “Muscles of the face either pull up or pull down.

The face contains over 40 muscles responsible for our expressions and movements. Unlike body muscles that attach to bones on both ends, many facial muscles connect directly to the skin on one end.

‌Hemifacial spasm is a disorder of the nerves and muscles that causes nonpainful involuntary twitching on one side of the face. Many people refer to hemifacial spasms as lip muscle spasms.

In many cases, this condition only affects one side of your face, though. If your facial nerve becomes inflamed or damaged, it can affect your control over muscle groups in your: Eyebrow ...

This can make the muscles on one side of the face droop. Experts don’t know exactly why Bell’s palsy happens, but some think it may be related to a viral infection of the facial nerve.

Coyotes have the face muscles for that ‘sad-puppy’ look. ... He examined a little facial muscle called the LAOM at the upper, outer side of each eye in 10 coyote cadavers from Texas.