A Muscle is a Little Mouse?!

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Across
  1. 4. The mythological king who couldn't reach the fruit or drink
  2. 5. study of the origin of words
  3. 6. Invented by Edward Jenner and used today to protect us from some illnesses
  4. 8. To be in a wild rage
  5. 9. word meaning cow
  6. 12. Tempt a person with something they can’t have
  7. 13. first letter of the Greek alphabet
Down
  1. 1. The language from which ‘berserk’ comes
  2. 2. Time spent alone when we have a dangerous illness that is easily spread
  3. 3. The word for the evil spirit in a nightmare
  4. 7. mice in our arms!
  5. 10. A word that means awesome or stylish but originally meant a bit cold
  6. 11. Someone who is wise