endoderm /en·do·derm/ (en´do-derm) the innermost of the three primitive germ layers of the embryo; from it are derived the epithelium of the pharynx, respiratory tract (except the nose), digestive tract, bladder, and urethra.endoder´malendoder´mic
endoderm
en·do·derm ( n d -dûrm ) or en·to·derm (nt-)n. The innermost of the three primary germ layers of an embryo, developing into the gastrointestinal tract, the lungs, and associated structures. Also called hypoblast. en do·dermal adj. |
endoderm
[en′dədurm]
Etymology: Gk, endon + derma, skin
(in embryology) the innermost of the cell layers that develop from the embryonic disk of the inner cell mass of the blastocyst. From the endoderm arises the epithelium of the trachea, bronchi, lungs, GI tract, liver, pancreas, urinary bladder, anal canal, pharynx, thyroid, tympanic cavity, tonsils, and parathyroid glands. The endoderm thus comprises the lining of the cavities and passages of the body and the covering of most of the internal organs. Compare ectoderm, hypoblast, mesoderm.
endoderm
see entoderm.
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