Muscle Positions and Actions

Flashcards for muscle positions and actions.

The __ forms most of the cheek and gives it shape.

Buccinator

The buccinator compresses the cheek to keep __ in the mouth while chewing (aids mastication).

food

The __ joins the lower cheek to the corner of the mouth and pulls back angles of the corner of the mouth, as in smiling and grimacing.

Risorius

The __ forms the chin.

Mentalis

The mentalis lifts the chin and pulls the __ outwards.

bottom lip

The __ runs from the corner of the lower lip and extends over the chin and pulls the corner of the mouth downwards.

Triangularis

The __ runs down the cheek towards the corner of the mouth and pulls the corner of the mouth upwards and sideways, as in smiling and laughing.

Zygomaticus

The __ runs down and back from the cheek to the angle of the jaw and raises the lower jaw for mastication.

Masseter

The __ runs either side of the neck and pulls the head down to the shoulders, rotates the head to the side, and pulls the head forward to the chest (flexion of the neck).

Stemocleidomastoid

The __ is in the front of the throat and covers the neck, pulling down the lower lip and angles of the mouth, and forms horizontal wrinkles in the neck.

Platysma

The __ is a kite-shaped muscle in the upper back and sides of the neck, rotating the shoulders, pulling back the scapula, pulling the shoulders back, and assisting in rotating the arm.

Trapezius

The __ is in the front of the chest, under the breast, pulling the arm forward and assisting the rotation of the arm.

Pectoralis