Germ layer Health Dictionary

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Germ Layer: From 2 Different Sources

Any one of the three discrete varieties of body tissue that develop in the early stages of growth of the EMBRYO. Development of the layers can be followed throughout the embryo’s stages of growth and specialisation into the body’s full range of tissues and organs (see ECTODERM; ENDODERM; MESODERM).
Health Source: Medical Dictionary
Author: Health Dictionary
any of the three distinct types of tissue found in the very early stages of embryonic development (see ectoderm; endoderm; mesoderm). The germ layers can be traced throughout embryonic development as they differentiate to form the entire range of body tissues.
Health Source: Oxford | Concise Colour Medical Dictionary
Author: Jonathan Law, Elizabeth Martin

Germ Cell

Those embryonic cells with the potential to develop into ova (see OVUM) or spermatozoa (see SPERMATOZOON).... germ cell

Germ

The popular term used to describe any microorganisms that cause disease, such as viruses and bacteria. (See also germ cells.)... germ

Germ Cell Tumour

A growth comprised of immature sperm cells in the male testis or of immature ova in the female ovary. A seminoma is one type of germ cell tumour (see testis, cancer of).... germ cell tumour

Four-layer System

a continuous compression bandage consisting of four layers that are applied and left in situ for up to seven days to treat venous leg ulcers, increasing the chance of healing by up to 30%. Thorough assessment of the patient’s status must be undertaken before the application.... four-layer system

Germ Plasm

the substance postulated by 19th-century biologists (notably Weismann) to be transmitted via the gametes from one generation to the next and to give rise to the body cells.... germ plasm

Malpighian Layer

the stratum germinativum: one of the layers of the *epidermis.... malpighian layer

Smear Layer

a layer of microcrystalline and organic particle debris that remains on the hard tissues of the teeth whenever they are cut. It may be important in assisting or preventing the penetration of bacteria into the dentinal tubules. The success of root canal treatment depends on the complete removal of the smear layer with a *chelating agent such as EDTA, but its presence may be useful in restorative dentistry.... smear layer

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