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