The Skeletal System Cartilages Objectives Know the basic

The Skeletal System Cartilages Objectives: -Know the basic structure, types, and location of cartilages -Know how cartilage grows Agenda: 1) Quick Read 2) Intro of skeletal system 3) Cartilage presentation Reminders: Vocab/ Stems due TOMORROW Life is 10% what happens to me and 90% of how I react to it. –Charles Swindoll

Figure 6. 1

Skeletal Cartilage • Contains no blood vessels or nerves • Surrounded by the perichondrium (dense irregular connective tissue) that resists outward expansion • Three types – hyaline, elastic, and fibrocartilage

Made of Cells called chondrocytes encased in small cavities, lacunae, within extracellular matrix (ground substance)

Hyaline Cartilage The most abundant cartilage in body Makes up most of fetal skeleton

Location 1. Articular-covers ends of most bones at moveable joints http: //www. youtube. com/watch? v=U 79_Rq. ZNIFg http: //videos. howstuffworks. com/discovery/29111 assignment-discovery-carticel-cartilage-implant-video. htm

2. Costal: connect ribs to sternum

3. Respiratory –forms larynx (voicebox) -trachea walls

4. Nasal –support external nose

Elastic cartilage-contains stretchy elastic fibers -better able to bend repeatedly

Found in -external ear -epiglottis http: //www. craniofacialcenter. com/book/Ear_2. htm

Fibrocartilage • Highly compressible • • Great tensile strength Found in menisci of knee & vertebrae of spine

4. Growth of Cartilage • • Appositional growth “growth from outside” cartilage-forming cell in the surrounding perichondrium secrete new matrix against the external face of existing cartilage

Interstitial growth • Lacuane-bound chondrocytes inside cartilage divide & secrete new matrix, expanding cartilage from within • Growth ends during adolescence when skeleton stops growing