Osteoblasts vs osteoclasts

Secondary ossification

Appears after the first ossification center. In longs bones it appears in the epiphysis

Osteoblast

Calcium phosphate is absorbed into the matrix and hardens it

Osteoblast

Canaliculi extend out from the cells and connect to the other cells (gap junctions) so they can exchange nutrients and wastes

Osteoclast

Cells that originate from the same cells that make monocytes in the blood. Theses cells will dissolve and erode away mature bone tissue

Osteoblast

Eventually these cells become imbedded in the matrix they produce

Osteoclast

Produces calcium phosphate that digests the collagen of bone matrix

Osteoblast

Secrete of matrix as they lie on existing bone surfaces

Osteoclast

Secrets hydrochloric acid that will dissolve calcium phosphate in bone

Osteoclast

The cells they originate from are blood stem cells, hemopoietic cells

Primary ossification

The first area of the bone to start ossification. Occurs in the diaphysis

Osteoblast

The imbedded osteoblasts is now an osteocyte

Osteoclast

The regions of bone they dissolve away will be replaced as osteoblasts come to those site and produce to bone matrix

Osteoblast

The space is occupies is called a lucuna

Osteoclast

These cells are large and multinucleated

Osteoblast

This cell can no longer divide

Osteoblast

This matrix is a jelly like material made up of protein collagen fibers