The Depressor anguli oris (Triangularis) arises from the oblique line of the mandible, whence its fibres converge, to be inserted, by a narrow fasciculus, into the angle of the mouth.

The depressor labii inferiorus is involved in pulling both the corner lip and lateral portion of the lower lip side down.

The Frontalis muscle, also known as the occipitofrontalis or epicranius, is thin, of a quadrilateral form, and intimately adherent to the superficial fascia. It is broader than the Occipitalis and its fibers are longer and paler in color. It is located on the front of the head.

The levator anguli oris (caninus) is a facial muscle of the mouth arising from the canine fossa, immediately below the infraorbital foramen.

The levator labii superioris (or quadratus labii superioris) is a muscle of the human body used in facial expression. It is a broad sheet, the origin of which extends from the side of the nose to the zygomatic bone.

The levator labii superioris alaeque nasi muscle is, translated from Latin, the “lifter of the upper lip and of the wing of the nose”. It has the longest name of any muscle in an animal.