TRAJECTORY OF GROUP-IA AND GROUP-IB FIBERS FROM THE HINDLIMB MUSCLES AT THE L3 AND L4 SEGMENTS OF THE SPINAL-CORD OF THE CAT
TRAJECTORY OF GROUP-IA AND GROUP-IB FIBERS FROM THE HINDLIMB MUSCLES AT THE L3 AND L4 SEGMENTS OF THE SPINAL-CORD OF THE CAT
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DOI：
10.1002/cne.902620202
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发表时间：
1987-08-08
影响因子：
2.5
通讯作者：
MANNEN, H
中科院分区：
文献类型：
--
作者：
HONGO, T;KUDO, N;MANNEN, H
十九个生理上确定的Ia组和5个Ib组纤维在L3和L4水平的脊髓起源于各种后肢肌肉的轴突内注射辣根过氧化物酶（HRP）。重建染色轴突的运动轨迹。它们向吻尾方向延伸8.6 mm-18.0 mm。上行轴突分布于背索的不同区域：来自脚趾肌肉的上行轴突（直径3 μ m）在旁正中区的近腹部分中延伸;来自小腿肌肉的那些（3.0-5.0 μ m）;来自大腿肌肉的那些（5.0-7.0 μ m）;以及来自外侧区域中的臀部肌肉的那些（6.0-7.0 μ m）。主支血管从母纤维发出，间隔0.5- 6.2mm，平均2.4mm。来自脚趾肌肉（直径1.0 μ m）的纤维束从背内侧进入克拉克柱，并且主要在柱的背内侧三分之一处分支。来自小腿肌肉（1.0-2.0 μ m）的纤维束从背侧进入克拉克柱，并终止于其中部以及V-VII层。来自大腿肌肉（1.0-2.5 μ m）的纤维束从外侧穿过或穿过克拉克柱的外侧部分，并终止于其腹外侧部分和V-VIII层。来自臀部肌肉的纤维束（1.5-2.5 μ m）从克拉克柱的侧面穿过，并且主要在层VII-IX中分支。随着肌肉的起源变得更近端，克拉克柱外终止的比例逐渐增加。因此，I组纤维的轨迹是在背索和灰质中组织的。终扣的长轴在Ia纤维中为0.5至17 μ m，在Ib纤维中为0.5至8 μ m。在克拉克柱内外都发现了“巨型”Ia钮（大于7 μ m）。
Nineteen physiologically identified group Ia and five group Ib fibers at the L3 and L4 levels of the spinal cord originating from various hind-limb muscles were intraaxonally injected with horseradish peroxidase (HRP). The trajectories of the stained axons were reconstructed. They extended for distances 8.6 mm-18.0 mm rostrocaudally. Ascending axons ran in various regions of the dorsal funiculus: The ascending axon from a toe muscle (3 .mu.m in diameter) ran in the ventralmost part of the paramedian region; those from shank muscles(3.0-5.0 .mu.m) in both dorsal and ventral paramedian regions; those from thigh muscles (5.0-7.0 .mu.m) in both the paramedian and the more lateral regions; and those from hip muscles (6.0-7.0 .mu.m) in the lateral region. Main collaterals arising from the parent fiber were given off at intervals of 0.5-6.2 mm (mean 2.4 mm). Collaterals of a fiber from a toe muscle (1.0 .mu.m in diameter) entered Clarke''s column from the dorsomedial side and ramified mostly in the dorsomedial one-third of the column. Collaterals of fibers from shank muscles (1.0-2.0 .mu.m) entered Clarke''s column from the dorsal side and terminated in its middle parts as well as in laminae V-VII. Collaterals of fibers from thigh muscles (1.0-2.5 .mu.m) passed lateral to or through the lateral part of Clarke''s column and terminated in its ventrolateral part and in laminae V-VIII. Collaterals of fibers from hip muscles (1.5-2.5 .mu.m) passed lateral to Clarke''s column and ramified mostly in laminae VII-IX. As the muscle of origin became more proximal, the proportion of termination outside of Clarke''s column progressively increased. Thus, the trajectory of group I fibers was somatotopically organized both in the dorsal funiculus and in the gray matter. The long axis of boutons ranged from 0.5 to 17 .mu.m in Ia fibers and from 0.5 to 8 .mu.m in Ib fibers. "Giant" Ia boutons (above 7 .mu.m) were found both in and outside Clarke''s column.