ANATOMY

GENERAL ANATOMY

SKELETAL ANATOMY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which is true of bone in an embryo?
A
The entire bone model is made of articular cartilage.
B
The entire bone model is made of hyaline cartilage.
C
Most of the bone model is made of hyaline cartilage with the outermost part of the diaphysis covered with a bony collar.
D
Most of the bone model is made of articular cartilage with the outermost part of the diaphysis covered with a bony collar
Explanation: 

Detailed explanation-1: -The cartilage model includes hyaline cartilage resembling the shape of the future bone as well as a surrounding membrane called the perichondrium.

Detailed explanation-2: -Hyaline cartilage is the most widespread and is the type that makes up the embryonic skeleton. It persists in human adults at the ends of bones in free-moving joints as articular cartilage, at the ends of the ribs, and in the nose, larynx, trachea, and bronchi.

Detailed explanation-3: -Endochondral Ossification These bones are called endochondral bones. In this process, the future bones are first formed as hyaline cartilage models.

Detailed explanation-4: -In the early stages of embryonic development, the embryo’s skeleton consists of fibrous membranes and hyaline cartilage. By the sixth or seventh week of embryonic life, the actual process of bone development, ossification (osteogenesis), begins.

Detailed explanation-5: -Bone formation requires a template for development. This template is mostly cartilage, derived from embryonic mesoderm, but also includes undifferentiated mesenchyme (fibrous membranes) in the case of intramembranous ossification. This framework determines where the bones will develop.

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