CHP7 Bone Tissue

endochondral zone of reserve cartilage layer of

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: forming Osteoblasts deposit temporary framework of trabeculae • Osteoclasts breakdown temporary bony framework to Osteoclasts enlarge the primary marrow cavity…bone ends remain as hyaline cartilage @ this stage hyaline Metaphysis= transitional zone between shaft & cartilage transitional heads of long bones heads • 5 zones of transformation from cartilage to bone zones cartilage Metaphysis Metaphysis Endochondral (cont.) Endochondral Zone of reserve cartilage= layer of ‘unchanged’ cartilage Zone of cell proliferation= (2nd) llayer of cartilage where ayer chondrocytes multiply & form columns of flat lacunae chondrocytes Zone of cell hypertrophy= (3rd) chondrocytes enlarge chondrocytes enlarge • Bone grows longer as cells multiply & swell Bone grows Zone of calcification= minerals deposited in matrix btwn columns minerals & calcify cartilage to form temporary support calcify Zone of bone deposition= llucanae walls breakdown & ucanae chondrocytes die; an empty channel remains that soon fills with osteoblasts & bld vessels • Lamella form around channel (becomes central canal) Lamella central • Osteoclasts dissolve calcified cartilage, concurrently Osteoclasts Secondary Ossification Center Secondary 2ndary ossification center= ~ birth, epiphyses begin to birth, form by similar processes as in 1o ossification center form • Chondrocytes swell; matrix dissolves & cells die; buds Chondrocytes of perichondrium grow into cartilage & osteoblasts/osteoclasts begin reorganizing tissue from epiphysis center outwards epiphysis • Trabeculae of cartilage matrix Trabeculae are calcified into spongy bone are Bone growth & remodeling Bone Hyaline cartilage remains in 2 places~ joint surfaces Hyaline (articular cartilage) & jjunction of diaphysis & epiphysis unction (epiphyseal plate) • A metaphysis (area of cartilagenous material) remains on metaphysis each side of epiphyseal plate each Bone continues to grow & remodel throughout life~ • Femurs become longer, curvature of cranial bones; Femurs athletes or manual labor ppl have greater bone density & mass mass • Bone surfaces develop/increase bumps, spines, & ridges Bone for muscle attachment for Bone gr...
View Full Document

This note was uploaded on 01/12/2014 for the course ZOO 250 taught by Professor Staff during the Fall '08 term at S.E. Louisiana.

Ask a homework question - tutors are online