Endoderm

of each other. Cephalization is the development of nervous tissues becoming concentrated towards the anterior end of an animal. Triploblasty means that an organism has three tissue layers, an ectoderm (outer layer), mesoderm (middle layer), and an endoderm (inner layer). Flatworms do not have a body cavity which makes them acoelomate. During embryonic development the blastopore develops into the mouth, making them protostomes. Flatworms can be parasitic and non-parasitic. Dugesia (planaria) are…

“prenatal” period. In the first phase, germinal stage, “the zygote begins to divide and grow in complexity during the first two weeks following conception” (Feldman, 2014). In the embryonic stage the zygote forms into an embryo and the ectoderm, endoderm, and mesoderm forms. The last phase is fetal and in this stage, the child begins to grow…

invertebrates (Myers, 2002). Typically, they can be found in marine water, freshwater, and general damp terrestrial habitats, being free living, but more than often parasitic (Myers, 2002). Additionally, platyhelminths are known to have three germ layers: an endoderm, ectoderm, and a mesoderm. The addition of the mesoderm allows animals to form true organ systems; however, this is all truly possible due to the mesoderm’s key feature, the coelom- a fluid-filled cavity that stores and protects…

The pancreas is a compound glandular organ; derived from the endoderm, and is located in the retroperitoneum associated with several vital structures, which complicate diagnostic and therapeutic procedures. Normally it has an average weight of 90 g, and is shaped like a tadpole, that is divided into four main anatomical areas: head, neck, body, and tail (7). The pancreatic head is the thickest portion of the pancreas and lies within the C-loop of the duodenum, to the right of the superior…

According to the guttmacher.org it states that the defintion of pregnancy is when “A woman is consider pregnant only when a fertilized egg has implanted in the wall of a females uterus.” This paper will be covering the Development periods and the Trimester. implanted in the lining of the women uterus. When a female is pregnant she will go through an orderly sequence that takes her through stages as the soon to be baby begins to grow. The term prenatal development is broken down into three…

What is the relevance of embryonic study to clinical medicine? Embryology consists of investigation of the cellular, molecular and structural factors contributing to the formation of an organism. It also provides a logical framework for understanding human anatomy. The fundamental knowledge of embryonic study is important for creating health care strategies for better reproductive outcomes. The expanding understanding on embryology has resulted in new techniques being developed for therapeutic…

Stem cells are cells that have the capacity to develop into some or many different cell types in the body, depending on whether they are multipotent or pluripotent. Serving as a sort of repair system, they can theoretically divide without limit to restore other cells for as long as the person or animal is still alive. When a stem cell divides, each "daughter" cell has the potential to either remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell…

Locomotion is the movement of a body from one place to another. There are various ways in which species of organisms in the 9 major phylum classes of the kingdom Animalia adapted unique muscle systems and how they use them. A phylum class includes organisms that are different but share important characteristics that resulted from evolutionary relationships among major groups of animals that allowed organisms to adapt in terms of the way they locomote. The Phylum Porifera is made up of sea…

The Animal Book Chapter 1: Animal characteristics Chapter 2: Body Parts Body plans refer to similarities in development, structure, and function among members of a particular group (phylum). At some point, members of that group share the same body plan during their development process. Which could be a possible explanation for shared structural plans that have been observed in the anatomy and embryology. Timing, pattern, and scale of development determine the organism's shape, and closely…

Criminology is a subject which aims towards discovering the reasons behind an individual’s choice to commit crime and their behaviour in some situations. By understanding a person’s motives to commit a crime, criminologists can try and prevent crime from happening. Several criminologists developed their own theories which explain why people commit crime, what makes them do it and also how we can prevent individuals from committing a crime again. The main theoretical perspectives examined in…