At the same time beneath the perichondrium osteoblasts are developed which also begin to give rise to spongy bone.
This tissue has a fibrous character and becomes converted into the perichondrium and other parts.
The free surface of the cartilage is invested by a fibrous membrane, the perichondrium.
perichondrium, per-i-kon′dri-um, n. the fibrous investment of cartilage.
In the earliest stage the future bone consists of hyaline cartilage surrounded by a vascular sheath, the perichondrium.
The perichondrium thus becomes the periosteum, and the bone produced by it, is periosteal or membrane bone.
perichondrium per·i·chon·dri·um (pěr'ĭ-kŏn'drē-əm)
n. pl per·i·chon·dri·a (-drē-ə)
The dense irregular fibrous membrane of connective tissue covering the surface of cartilage except at the endings of joints.