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Three types of protein fibers in CT matrix
- Collagen - tough, flexible, "rope"
- Elastin - stretches and recoils "rubberband"
- Reticular fibers - net-like
- Most common
- Closely packed collagen, smooth and firm
- Bone ends (articular), fetal skeleton
- Collagen + elastic fibers
- Tough & flexible
- External ear
- Networked collagen, durable
- Intervertebral discs, menisci
General characteristics of cartilage
- No innervation (nerves)
- Avascular (no blood vessels)
- Perichondrium - outer covering, support and nutrition
- -around most (not articular surfaces)
The most important matrix protein in cartilage?
The most important matrix protein in bone?
The key difference between bone and cartilage?
Ossification is the?
- The salts
- The complete replacement of a tissue with bone
- Outer surface, dense & solid
- Cells and matrix into osteons
- -pillars of layers
- -opposite orientation collagen fibers
- Resist forces parallel to surface and twisting
- Trabeculae from network
- Lightweight, multiple force directions
- Inside & ends of bones
- Yellow marrow - fat (diaphyses)
- Red marrow - stem & blood cells (located in epiphyses)
- Infants - most of bone is marrow
- Adults - proximal ends of femur and humerus, sternum and pelvis
- Covering of CT, blasts, clasts
- N & blood supply
- Growth and remodeling, fusion w/ CT framework - ligaments, tendons, fascia