Skeletal System

4. an opening, hole, or passage, especially in a bone
7. the shaft or central part of a long bone
9. articulation that permits free movement, a freely movable joint (also called synovial joint)
12. a cavity or depression, especially in bone
15. the formation of bone
16. a lifelong process where mature bone tissue is removed from the skeleton and new bone tissue is formed
18. an anatomical feature of the infant human skull comprising any of the soft membranous gaps (sutures) between the cranial bones that make up the calvaria of a fetus or an infant
19. a bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted
20. system the cylindrical, column-like structures in compact bones, it consists of microscopic cylindrical structures oriented parallel to the long axis of a bone

1. a type of continuous, slightly movable joint
2. microscopic canals between the lacunae of ossified bone, its radiating processes of the osteocytes (called filo podia) project into these canals; these cytoplasmic processes are joined together by gap junctions
3. the state of being jointed
5. a cell that has secreted the matrix of cartilage and become embedded in it
6. a thin layer, membrane, scale, or plate like tissue or part, especially in bone tissue
8. plate a hyaline cartilage plate in the metaphysis at each end of a long bone, its plate is found in children and adolescents; in adults who have stopped growing, the plate is replaced by an epiphyseal line
10. the production of blood cells and platelets, which occurs in the bone marrow
11. a fluid-filled sac or saclike cavity, especially one countering friction at a joint
13. the absorption into the circulation of cells or tissue
14. a dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints
17. a cell that secretes the matrix for bone formation
21. membrane the soft tissue found between the articular capsule (joint capsule) and the joint cavity of synovial joints