Chapter 8, Problem 10WYL

Summary Introduction

To determine:

The week during which separate fingers and toes are formed.

Introduction:

The bone is formed by either intramembranous ossification or endochondral ossification. The skull bones are mostly formed from intramembranous ossification, whereas almost all of the remaining bones of the skeleton form through endochondral ossification. The appendicular skeleton starts to develop during the fourth week when limb bud appears as a small ridge along the lateral sides of the embryo