Bird M M
J Anat. 1985 Jun;140 ( Pt 4)(Pt 4):651-8.
Explants from embryonic chick tectum maintained in culture for at least two weeks contained presynaptic dendrites, characterised by focal presynaptic specialisations in addition to the usual fine structural features of dendrites. The explants also contained bouton-like structures with both pre- and postsynaptic specialisations, interpreted as the terminal parts and appendages of the presynaptic dendrites. The dendrites and their appendages engaged in various serial synapses including triplet and reciprocal synapses. Although it is known that cells which do not normally have presynaptic dendrites may be induced to develop them under abnormal developmental or pathological conditions, the development of presynaptic dendrites in the present material is more likely to be a manifestation of organotypic development, since the adult avian tectum normally contains cells with presynaptic dendrites.
在培养中维持至少两周的鸡胚顶盖外植体含有突触前树突，其特征除了具有树突通常的精细结构特征外，还有局灶性突触前特化。外植体还含有具有突触前和突触后特化的纽扣样结构，被解释为突触前树突的终末部分和附属物。树突及其附属物参与了各种串联突触，包括三联体突触和相互突触。虽然已知在异常发育或病理条件下，通常没有突触前树突的细胞可能会被诱导产生突触前树突，但本材料中突触前树突的发育更可能是器官型发育的一种表现，因为成年鸟类顶盖通常含有具有突触前树突的细胞。
