part of part_of has part has_part develops from anatomical structure 解剖结构 mixed endoderm/mesoderm-derived structure 混合内胚层/中胚层衍生结构 anterior region of body 身体前部 endocrine system 内分泌系统 endocrine gland 内分泌腺 thymus 胸腺 A thymus develops in all vertebrates from the endodermal epithelium of certain pharyngeal pouches and from the adjacent ectodermal epithelium. In fishes, all the pouches, or the first four, contribute to thymus formation, but in tetrapods, the number is more restricted. In mammals, only the third and fourth are involved, and the contribution of the third is by far the greater.[well established][VHOG] AAO:0010548 Anatomical structure of largely lymphoid tissue that functions in cell-mediated immunity by being the site where T cells develop. Anatomical structure which originates as several paired thickenings on the dorsal side of the pharyngeal pouches and secretes thymosin.[AAO] BTO:0001374 CALOHA:TS-1043 EFO:0000860 EHDAA2:0002017 EHDAA:9119 EMAPA:18768 EV:0100138 FMA:9607 GAID:464 MA:0000142 MAT:0000080 MESH:A06.407.850 MIAA:0000080 OpenCyc:Mx4rvpIympwpEbGdrcN5Y29ycA TAO:0001078 UBERON:0002370 UMLS:C0040113 VHOG:0000253 XAO:0000163 ZFA:0001078 check - a subtype of gland? not in GO. NCIT has thymus and thymus gland. EHDAA2 has ductless gland. thymic thymus gland thymus gland thymus organ thymus organ uberon 大部分淋巴组织的解剖结构，通过成为T细胞发育的部位而在细胞免疫中起作用。 检查-腺体的亚型？ 不在GO。 NCIT有胸腺(thymus)和胸腺(thymus gland)。 EHDAA2有无管腺。 胸腺 胸腺 胸腺 胸腺器官 胸腺器官 胸腺在所有脊椎动物中由某些咽囊的内胚层上皮和相邻的外胚层上皮发育而成。在鱼类中，所有的袋囊或前四个袋囊都有助于胸腺的形成，但在四足动物中，数量更受限制。在哺乳动物中，只有第3和第4只参与其中，而第3类的贡献则要大得多。[well established][VHOG] 起源成为咽囊背侧的成对增厚的解剖学结构，其分泌胸腺素。[AAO] hematopoietic system 造血系统 immune system 免疫系统 gland 腺(gland) thymus lymphoid tissue 胸腺淋巴组织 thymus epithelium 胸腺上皮 hemopoietic organ 造血器官 immune organ 免疫器官 hemolymphoid system gland 血淋巴系统腺 thymus primordium 胸腺原基