Embryology at a Glance 2nd Edition 2018
Embryology at a Glance 2nd Edition 2018Our biological development is a fascinating subject deserving study for interest’s sake alone. Anunderstanding of embryological development also helps us answer questions about our adult anatomy, why congenital abnormalities sometimes occur and gives us
insights into where we come from. In medicine the importance of an understanding of normal development quickly becomes clear as a student begins to make the same links between embryology, .anatomy, physiology and neonatal medicine. The study of embryology has been documented as far back as the sixth century bc when the chicken egg was noted as a perfect way of studying development. Aristotle (384–322 bc) compared preformationism and epigenetic theories of development.
Why study embryology?
Do animals begin in a preformed way, merely becoming larger, or do they form from something much simpler, developing the struc- tures and systems of the adult in time? From studies of chickens’ eggs of different days of incubation and comparisons with the embryos of other animals Aristotle favoured epigenetic theory, noting similarities between the embryos of humans and other animals in very early stages. In a chicken’s egg, a beating heart can be observed with the naked eye before much else of the chicken has formed. Aristotle’s views directed the field of embryology until the invention of the light microscope in the late 1500s. From theno onwardsembryology as a field of study was developed.
A common problem that students face when studying embryology is the apparent complexity of the topic. Cells change names, the vocabulary seems vast, shapes form, are named and renamed, and not only are there structures to be concerned with but also the changes to those structures with time. In anatomy, structures acquire new names as they move to a new place or pass another structure (e.g. the external iliac artery passes deep to the inguinal ligament and becomes the femoral artery).
In embryology, cells acquire new names when they differentiate to become more specialised or group together in a new place; structures have new names when they move, change shape or new structures form around them. With time and study students discover these processes, just as they discover anatomical structures.
Here you can download the book