Hanaway J, Smith J M
J Comp Neurol. 1979 Feb 1;183(3):471-86. doi: 10.1002/cne.901830303.
The lateral basal region (LBR) of the spinal cord gray matter (Rexed's laminae IV-VII) by physiologic and anatomic criteria is the major terminal zone for the corticospinal (CS) tract in the cat. The neurons in this area are medium-sized with abundant spines on their dendrites. Axon terminals on the dendrites and somata of these neurons form synapses easily classified as asymmetric with spheroid vesicles and symmetric with flattened vesicles. There are rare exceptions to this. In a systematic count of terminals, 82% have spheroid and 18% flattened vesicles. The majority of all terminals are on dendrites (84.9%) and a minority on somata (14.1%). Less than 1% are axoaxonic. Degeneration of the corticospinal tract was produced by transecting one hemisphere of our experimental cats. Its termination in the lower cervical cord was studied for 17 hours to 7 days after surgery. Vesicle depletion and clumping and dense polymembranous inclusions were the most common forms of degeneration. Filamentous proliferation in the terminals was also prominent; dark degeneration, however, was infrequent. The percent of degenerating CS terminals in the LBR was the following: 17 hours - 2.2%, 36 hours - 4.19%, 2 days - 10.3%, 3 days - 8.4%, 4 days - 6.9%, 7 days - 10.25%; 84.8% of degenerating CS terminals were axodendritic and 15.2% axosomatic.
根据生理和解剖学标准，脊髓灰质的外侧基部区域（LBR，即Rexed板层IV-VII）是猫皮质脊髓（CS）束的主要终末区。该区域的神经元为中等大小，其树突上有丰富的棘。这些神经元树突和胞体上的轴突终末形成的突触很容易分为含球状小泡的不对称突触和含扁平小泡的对称突触。但也有罕见的例外情况。在对终末进行系统计数时，82%的终末含球状小泡，18%含扁平小泡。所有终末大部分位于树突上（84.9%），少数位于胞体上（14.1%）。轴-轴突触少于1%。通过横断实验猫的一个半球来造成皮质脊髓束的变性。在术后17小时至7天研究其在下颈髓的终末情况。小泡耗竭、聚集以及密集的多膜性内含物是最常见的变性形式。终末中的丝状增生也很明显；然而，深色变性并不常见。LBR中变性的CS终末百分比情况如下：17小时 - 2.2%，36小时 - 4.19%，2天 - 10.3%，3天 - 8.4%，4天 - 6.9%，7天 - 10.25%；84.8%的变性CS终末为轴-树突突触，15.2%为轴-体突触。
