CORTICO-SPINAL TRACT OF THE CAT - AN ATTEMPT TO CORRELATE THE PATTERN OF DEGENERATION WITH DEFICITS IN REFLEX ACTIVITY FOLLOWING NEOCORTICAL LESIONS
CORTICO-SPINAL TRACT OF THE CAT - AN ATTEMPT TO CORRELATE THE PATTERN OF DEGENERATION WITH DEFICITS IN REFLEX ACTIVITY FOLLOWING NEOCORTICAL LESIONS
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DOI：
10.1002/cne.901080103
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发表时间：
1957-01-01
影响因子：
2.5
通讯作者：
LIU, CN
中科院分区：
文献类型：
--
作者：
CHAMBERS, WW;LIU, CN
用Nauta和Marchi技术对12只猫的皮质脊髓束的起源部位和脊髓分布进行了测定。该束起源于乙状回、冠状回和外侧裂前回，而不是来自顶叶、枕叶和颞叶。单侧损伤（乙状回消融或球锥体部分）后发现两条神经束：一条大的交叉侧束和一条小的不交叉腹侧束。腹侧束延伸到上颈段，在腹侧白色连合处交叉，然后进入脊髓灰质。相反，在单侧损伤外侧前回后，可观察到4条神经束（交叉和非交叉，外侧和腹侧）。所有4个束都很小，交叉的外侧束和不交叉的腹侧束较大。所有皮质脊髓束的终末前分布（Marchi未显示）主要分布于背角，部分纤维分布于中间灰质。此外，薄束核和楔束核也有较多纤维分布，Clark核也有少量纤维分布。腹角未见终末前变性。皮质脊髓束的这种分布表明该系统对感觉和运动机制的影响。乙状回的离散病变（缺陷仅限于单个肢体）表明皮质脊髓系统不仅在其皮质起源处而且在其脊髓终止处都是空间组织的。
The sites of origin and spinal distribution of the cortico-spinal tract have been determined by Nauta and Marchi techniques in 12 cats. The tract originates in the sigmoid, coronal and anterior ectosylvian gyri, and not from parietal, occipital and temporal areas. Two tracts are found following unilateral lesion (ablation of sigmoid gyrus or section of bulbar pyramid): a large crossed, lateral tract and a small uncrossed ventral tract. The ventral tract extends into upper cervical segments and crosses in ventral white commissure before entering spinal gray. In contrast 4 tracts are seen following unilateral lesion of anterior ectosylvian gyrus (crossed and uncrossed, lateral and ventral). All 4 tracts are small, the crossed lateral and uncrossed ventral being the larger. The preterminal distribution of all cortico-spinal tracts (not revealed by Marchi) was chiefly to the dorsal horn with some fibers to the intermediate gray. In addition many fibers were distributed to gracile and cuneate nuclei and a few to Clarke''s nucleus. No preterminal degeneration was found in the ventral horn. This distribution of the cortico-spinal tract suggests an influence of this system on sensory as well as motor mechanisms. Discrete lesions of the sigmoid gyrus, with deficits limited to a single limb, reveal that the cortico-spinal system is spatially organized not only at its cortical origin but also at its spinal termination.