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CMCBones
Bones function, structure, etc.
| Question | Answer |
|---|---|
| Bones: Function (5) | Support, Protect, Movement, Storage of fat and calcium, Hematopoiesis. |
| Bone Markings Tip: Terms Beginning With T | Projections. |
| Bone Markings Tip: Terms Beginning With F (except facet) | Depressions. |
| Bones: Classification | 206 bones. Classified by tissue type and shape. |
| Compact Osseous Tissue | Dense and looks smooth. |
| Spongy Osseous Tissue | Composed of needlelike pieces and has lots of open space. |
| Long Bones | Limbs, Longer than wider, compact bone. |
| Short Bones | Sesamoid, wrist, ankle, patella. Cube-shaped and spongy. |
| Irregular Bones | Vertebrae, hips. Whatever doesn't fit into the other categories. |
| Long Bone: Composed of | Epiphysis. |
| Epiphysis | The ends of the bone. |
| Epiphysis: Composed of | Spongy bone. |
| Articular Cartilage | Covers the epiphysis. Provides slippery surface and friction free movement. |
| Articular Cartilage: Composed of | Hyaline Cartilage. |
| Epiphyseal Line | Remnant of the epiphyseal plate from childhood where lengthwise growth of bones happened. |
| Diaphysis | Middle of the bone composed of compact bone. |
| Periosteum | Covers the diaphysis. |
| Sharpey's Fibres | Secure the periosteum to the bone. |
| Nutrient Arteries | Provide blood to the tissue. |
| Medullary Cavity | Storage of fat tissue in adults: "yellow marrow". In infants, red blood cells: "red marrow". |
| Osteocytes: Location | Cavities called lacunae. |
| Lacunae: Arranged in | Concentric circles called lamella. |
| Centre of Lamella | Haversian canal. |
| Canaliculi | Tiny canals that connect bone cells to the nutrient supply and allow bones to heal quickly. |
| Calcium Salts | Give bones hardness and compression resistance. |
| Collagen Fibres | Provide flexibility and strength. |
| Ossification | Process of bone growth. |
| Osteoblasts | Convert hyaline cartilage to bone tissue in fetus. |
| Change After Growth #1 | Pull of gravity and muscles on the skeleton. |
| Bedridden People | Less bone mass. |
| Body Builders | Bones are thick where muscles attach. |
| Change After Growth #2 | Calcium levels in blood. |
| Osteoclasts | When calcium is needed osteoclast break down the bone to release calcium in the blood. When calcium is high, it is deposited back on to the bones. |
| Open or Compound Break | Break that penetrates the skin. |
| Closed or Simple Break | Clean break. |
| Comminuted Break | Bone breaks into fragments. |
| Compression Break | Bone is crushed. |
| Depression Break | Bone is pressed inward (skull). |
| Spiral Break | Ragged break, occurs from twisting. |
| Impacted Break | Broken bone ends are forced into each other. |
| Greenstick Break | Incomplete break. |
| Hairline Break | Very small crack in the bone "stress fracture". |
| Rickets | Disease of children where bones fail to calcify. Bones show a "bowing". Lack of calcium or vitamin D. |
| Reduction | Realignment of broken bone ends. Manually moving bones, or through surgery. |
| Bone Healing Time | 6-8 Weeks. Takes longer for older people because of low blood circulation. |
| Bone Repair Step 1 | Hematoma Forms: Blood fills breakage area and swelling occurs. |
| Bone Repair Step 2 | Fibrocartilage forms between the break and new blood vessels fill the gap. |
| Bone Repair Step 3 | A bony callus starts to form by osteoblasts and replaces the fibrocartilage. |
| Bone Repair Step 4 | Over the next few months, the bony callus remodels itself to form a more sturdy patch on the fracture site. |
| Tuberosity | Large, rounded projection; may be roughened. |
| Condyle | Rounded articular projection. |
| Articulate (Articulation) | Joint where two bones meet. |
| Sinus | Cavity withing bone, filled with air and lined with mucous membrane. |
| Epicondyle | Raised area on or above a condyle. |
| Process | Any bone prominence. |
| Crest | Narrow ridge of bone; usually prominent. |
| Trochanter | Very large, blunt, irregularly shaped process (the only examples are on femur). |
| Foramen | Round or oval opening through a bone. |
| Facet | Smooth, nearly flat articular surface. |
| Fossa | Shallow, basin-like depression in bone, often serving as an articular surface. |
| Meatus | Canal-like passageway. |
| Parts of Skeleton (2) | Axial, Appendicular. |
| Axial | Skull, Thoracic Cage, Vertebral Column. |
| Appendicular | Limbs, Pectoral Girdle, Pelvic Girdle. |