Actions of facial muscles

Adducts scapula draws scapulae together. It is also a plantar flexor of the foot at the ankle joint. Typically, one attachment remains stationary and is called the origin and the other attachment moves and is called the insertion. The gastrocnemius attaches to the distal end of the femur and inserts onto the heel bone by way of the calcaneal Achilles tendon. Special types of movement occur at particular joints and include: The muscles on each side form a trapezoid shape. Fig 1 — The external and internal intercostals of the thoracic wall.

This muscle has two heads and forms the curved calf of the posterior leg. It attaches to the tarsal bones on the medial side of the foot and dorsiflexes and inverts the foot. These muscles act to change the volume of the thoracic cavity during respiration. The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. Wikimedia Commons has media related to Zygomaticus major muscles.