Across
- 3. first vertebra
- 6. encloses and protects the brain
- 9. a cavity in the diaphysis
- 10. occurs in the yolk sack, liver and spleen, and red bone marrow
- 12. the portion of the skeleton that consists of the skull, hyoid bone, vertebral column, and thoracic cage
- 13. break down bone matrix
- 16. a plate that remains between the primary and secondary ossification centers
- 17. articulates with the humerus, ulna, and wrists
- 19. form bone tissue within the membranous layers
- 21. bone with continuous extracellular matrix
- 22. extends from the scapula to the elbow
- 24. second vertebra
- 25. triangular structure formed of five fused vertebrae
- 27. bones that develop from sheetlike layers of specialized connective tissues
Down
- 1. bones that develop as hyaline cartilage that is later replaced by bone tissue
- 2. round
- 4. consists of a manubrium, bod, and xiphoid processes
- 5. rodlike bones located between the sternum and scapulae
- 7. broad, triangular bones that articulate with the humerus of each upper limb
- 8. twelve pairs attached to twelve thoracic vertebrae.
- 11. the portion of the skeleton that includes the pectoral girdle and upper limbs
- 14. fills the medullary cavity
- 15. mature bone cells
- 18. cartilage,
- 20. hundred and six, amount of bones in the adult skeleton
- 23. ends of bones that form joints with adjacent bones
- 25. bone with irregular interconnecting spaces between bony plates
- 26. forms the lowest part of the vertebral canal
- 28. articulates with the radius laterally and with a disc of fibrocartilage