Muscle of the body with S

• sphincter

  Sphincter is a ring of muscle controlling openings.

• sternocleidomastoid

  Sternocleidomastoid turns and flexes the neck.

• skeleton
• serratus

  Serratus is a saw-toothed muscle group on the ribs.

• stomach muscle

  Colloquial for abdominal muscles of stomach

• Shoulders

  Shoulder muscles group: deltoid, rotator cuff etc.

• shin muscle

  Generic term for the tibialis area muscle

The words in the list Muscle of the body with S come from players of the word game City, Country, River.