The hymen is a part of the female reproductive system and can break under certain circumstances.

The cell membrane plays an important role in maintaining the structure of the cell.

The ophthalmologist diagnosed me with uveitis.

Cats close their nictitating membrane when they are surprised.

The serous membrane covers many organs in the body.

The cere of this bird is very brightly colored.

He is training his triceps brachii muscle every day.

He is doing special exercises to strengthen the opponens digiti minimi muscle of his foot.

My opponens pollicis muscle hurts.

He underwent surgery due to an injury to his extensor digitorum communis.