Question

Embryonic skeleton of bony vertebrates is made of

Answer 1

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In the embryos of bony vertebrates the endoskeleton is made up of cartilage which further converted into bone during development.

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Answer 2

Answer:

The embryo's skeleton is made up of hyaline cartilage and fibrous membranes during the early stages of development.

Explanation:

During the early stages of development, the embryo's skeleton is formed of hyaline cartilage and fibrous membranes. Ectoderm and endoderm are the only two tissue layers that make up the early embryo. The real ossification (osteogenesis) phase of bone growth starts by the sixth or seventh week of embryonic life.

• Ectodermal cell proliferation causes a longitudinal thickening when the early embryo is only made up of the two tissue layers endoderm and ectoderm.
• The notochord and the mesoderm, the third basic layer, are produced by this thickening, or primitive streak. In the embryonic skeleton, cartilage serves as the precursor of the first form of bone, which is gradually replaced by bone.
• Osteoid is a gelatinous matrix material secreted by specialized connective tissue cells called osteoblasts that is formed of the fibrous protein collagen and the organic glue mucopolysaccharide.