Bannatyne B A, Maxwell D J, Fyffe R E, Brown A G
Q J Exp Physiol. 1984 Jul;69(3):547-57. doi: 10.1113/expphysiol.1984.sp002841.
Three slowly adapting type I and two slowly adapting type II afferent fibres from the lumbosacral cord of the cat were intra-axonally labelled with horseradish peroxidase and processed for light and electron microscopy. Terminals from both types of afferent exhibited similar ultrastructural features in that both formed contacts with one to five post-synaptic profiles, including dendritic shafts and spine heads, some of which contained vesicles. The stained axons were themselves post-synaptic in axo-axonic synapses. Maximum diameters of slowly adapting boutons and the dendritic shafts on which they terminated were measured. The present results indicate that there is considerable overlap in the morphological characteristics studied for all large myelinated cutaneous afferent boutons. It is not possible therefore to distinguish between these on ultrastructural grounds alone.
从猫的腰骶脊髓中选取了三条慢适应I型和两条慢适应II型传入纤维，通过轴突内注射辣根过氧化物酶进行标记，并进行光镜和电镜处理。两种传入纤维的终末表现出相似的超微结构特征，即它们都与一至五个突触后成分形成接触，包括树突干和棘突头，其中一些含有囊泡。被染色的轴突本身在轴-轴突触中是突触后成分。测量了慢适应终扣及其终止的树突干的最大直径。目前的结果表明，在所有大的有髓皮肤传入终扣所研究的形态学特征上存在相当大的重叠。因此，仅根据超微结构的依据无法区分它们。
