Platysma

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Platysma

Platysma (pronunciation: /pləˈtɪzmə/) is a superficial muscle that overlaps the sternocleidomastoid in the neck. It is a thin, broad sheet of muscle derived from the pectoral and deltoid muscles.

Etymology

The term "platysma" is derived from the Greek word "platys", meaning "broad". This is in reference to the broad, flat shape of the muscle.

Anatomy

The platysma muscle is found in the superficial fascia of the neck, extending from the upper parts of the pectoralis major and deltoid muscles to the base of the mandible. It is responsible for depressing the lower lip and corner of the mouth, contributing to facial expressions of surprise or fright.

Related Terms

  • Sternocleidomastoid: This is a muscle in the neck that acts to flex and rotate the head.
  • Pectoralis Major: A thick, fan-shaped muscle situated at the chest (anterior) of the human body.
  • Deltoid: A large triangular muscle covering the joint of the shoulder, responsible for lifting the arm and giving the shoulder its range of motion.

See Also

External links

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