All nourishment is by means of diffusion through the matrix, so cartilage seldom acquires much thickness although it grows by internal expansion. There are drawings of the different types of cartilage on display. They have different amounts of calcification which is the addition of calcium salts and differ in their fibre content. Cartilage is derived from mesochyme and forms a matrix for bones, ends of bones, intercostals from ribs, nose, ears etc. Name the three major types of cartilage.
Bone can either be dermal or replacement.
Dermal bone forms directly in the skin from mesenchyme. Osteoblasts form a calcium phosphate matrix and deposit salts, they then become osteocytes. Dermal bones are plate like, but can become thicker or grow at the edges. Membrane bones are deep bones that also do not have a primary cartilage matrix. Give some examples of dermal bones seen in this lab.