What is a Gastrula and Blastula?
gastrula, early multicellular embryo, composed of two or more germinal layers of cells from which the various organs later derive. The gastrula develops from the hollow, single-layered ball of cells called a blastula which itself is the product of the repeated cell division, or cleavage, of a fertilized egg.
What are the three primary germ layers quizlet?
The ectoderm, mesoderm, and endoderm; the three tissue layers of an early embryo from which all later tissues and organs arise. is an outer layer that gives rise to the epidermis and nervous system.
What does the endoderm become?
Endoderm cells give rise to certain organs, among them the colon, the stomach, the intestines, the lungs, the liver, and the pancreas. The ectoderm, on the other hand, eventually forms certain “outer linings” of the body, including the epidermis (outermost skin layer) and hair.
What does the mesoderm become?
The mesoderm gives rise to the skeletal muscles, smooth muscle, blood vessels, bone, cartilage, joints, connective tissue, endocrine glands, kidney cortex, heart muscle, urogenital organ, uterus, fallopian tube, testicles and blood cells from the spinal cord and lymphatic tissue (see Fig.
What is the difference between a blastula and a gastrula?
Gastrula: Gastrula is an embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells. Blastula: Blastula is formed from the morula in the process called blastulation. Gastrula: Gastrula is formed from the blastula in the process called gastrulation.
How are the cells in the blastula formed?
Visit the Virtual Human Embryo project at the Endowment for Human Development site to click through an interactive of the stages of embryo development, including micrographs and rotating 3-D images. The cells in the blastula then rearrange themselves spatially to form three layers of cells. This process is called gastrulation.
How does gastrulation lead to the development of organs?
Gastrulation leads to the formation of the three germ layers that give rise during further development to the different organs in the animal body. This process is called organogenesis. Organs develop from the germ layers through the process of differentiation.
How are the three layers of cells involved in gastrulation?
This process is called gastrulation. During gastrulation, the blastula folds in on itself and cells migrate to form the three layers of cells (Figure 13.10) in a structure, the gastrula, with a hollow space that will become the digestive tract. Each of the layers of cells is called a germ layer and will differentiate into different organ systems.