CHAPTER 7 Skeletal System: The Skull

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Across
  1. 3. ventral derivative of the
  2. 5. having two joints
  3. 6. bony flap cover of exit gill slits
  4. 7. jaw suspension in mammals
  5. 10. lies behind the orbit
  6. 15. having one joint
  7. 18. runs across the top of the skull
  8. 20. behind the jaws
  9. 21. none of the arches attaches themselves directly to the skull
  10. 24. joint passes through the dermatocranium behind the eye
  11. 25. dermal bones encircle the eye to define the orbit superficially
  12. 27. teeth are continually replaced
  13. 29. encircles the external naris/forms the snout
  14. 30. gap that partially divided posterior braincase.
  15. 32. mandibular arch is attached to the braincase
  16. 33. proposed the composite theory
  17. 34. use of a rapid sticky tongue to capture prey
  18. 36. in which the Meckel's cartilage is usually encased
  19. 37. fused cranial components immediately surrounding the brain
  20. 38. movement within skull
  21. 39. hold the olfactory epithelium
  22. 40. chewing of food before swallowing
Down
  1. 1. first fully functional arch of the jaw
  2. 2. hinge passes across the back of the skull allowing rotation
  3. 4. mandibular arch of gnathostomes is formed by fusion of parts of the premandibular arch and parts of the mandibular arch of jawless ancestors
  4. 8. fusion of various bones in different species
  5. 9. equivalent term for chondrocranium
  6. 11. composed of dermal bones
  7. 12. joint in the dermatocranium passes in front of the orbits
  8. 13. internal skeleton
  9. 14. rapidly grasp the prey with its jaws
  10. 16. earliest jawed condition
  11. 17. formed of endochondral bone or of cartilage
  12. 19. no movement between upper jaw and braincase
  13. 22. cover much of the roof of the mouth
  14. 23. formed from or within the integument
  15. 26. Branchial arches that support the mouth
  16. 28. two successive sets of teeth
  17. 31. dermal plates of the head were thick and tightly joined
  18. 35. most ancient part of the skull
  19. 36. jaw suspension in most amphibians, reptiles, and birds