Pronunciation: [ɛɡzˈə͡ʊdəm] (IPA) 
The word "exoderm" is spelled with an "o" in the second syllable, rather than an "i" as is the case with words like "endoderm" or "mesoderm". This is because the "o" represents the sound "ɑ" (as in "father"), while the "i" represents the sound "ɪ" (as in "bit"). The IPA phonetic transcription of "exoderm" is "ɛksəʊdɜːm", with the stressed syllable being the first one, pronounced "ɛks".
The term "exoderm" refers to a layer or tissue found in the early embryo during its developmental stages. It specifically pertains to the outer layer of cells that forms the ectoderm, which is one of the three primary germ layers responsible for the formation of various bodily tissues and structures. The exoderm is essential in the early stages of embryogenesis and the differentiation of cells.
During embryonic development, the exoderm gives rise to critical structures such as the epidermis, hair, nails, and glands. It also contributes to the formation of the nervous system, including the brain and spinal cord, as well as sensory organs like the eyes and ears. Additionally, the exoderm is involved in the development of the neural crest, a group of cells that plays a crucial role in the formation of a diverse range of tissues and structures throughout the body.
The exoderm is formed through a process called gastrulation, which occurs during the early stages of embryonic development. Gastrulation involves the migration and rearrangement of cells to form distinct germ layers, including the exoderm. This layer ultimately gives rise to a multitude of important tissues in the developing organism.
In summary, exoderm refers to the outer layer of cells in the developing embryo, playing a vital role in the formation of various tissues and structures, such as the epidermis, nervous system, sensory organs, and neural crest.
The word "exoderm" is derived from the combination of two Greek roots: "exo", meaning "outside", and "derma", meaning "skin". "Exoderm" thus refers to the outer layer of the skin or the epidermis.
