SPINAL-CORD LOCATION OF THE MOTONEURONS INNERVATING THE ABDOMINAL, CUTANEOUS MAXIMUS, LATISSIMUS-DORSI AND LONGISSIMUS DORSI MUSCLES IN THE CAT
SPINAL-CORD LOCATION OF THE MOTONEURONS INNERVATING THE ABDOMINAL, CUTANEOUS MAXIMUS, LATISSIMUS-DORSI AND LONGISSIMUS DORSI MUSCLES IN THE CAT
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DOI：
10.1007/bf00269465
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发表时间：
1987-01-01
影响因子：
2
通讯作者：
EVERTSE, F
中科院分区：
文献类型：
--
作者：
HOLSTEGE, G;VANNEERVEN, J;EVERTSE, F
在猫的腹直肌、外斜肌、内斜肌、腹横肌、皮大肌、背阔肌和背最长肌中进行辣根过氧化物酶（HRP）注射。结果表明，支配外斜肌、内斜肌和腹横肌的运动神经元位于胸中段、胸段尾段和腰段上段的高度重叠区域。这些运动神经元细胞群存在于腹角的侧面以及胸椎尾部和腰椎上部水平，它们与白质接壤。直肌运动神经元的位置与其他运动神经元细胞组的位置有些不同，因为它们也存在于低颈椎和上胸椎水平，并且在 T12 至 L3 节段中，它们发现于其他腹肌运动神经元细胞组内侧的腹角。在胸椎中部水平，直肌运动神经元与其他腹肌运动神经元位于同一区域。在尾侧 C6 至喙侧 C8 水平的腹角腹外侧部分中观察到背阔肌运动神经元。此外，它们还发现于腹角横向的T9至L3节段，该区域与除直肌运动神经元外的其他腹肌运动神经元位于同一区域。背最长肌运动神经元位于所有胸段和上 4 腰段腹角的最腹侧部分。皮肤最大运动神经元存在于一个细胞群中，位于尾部 C8-喙 T1 灰质和白质边缘的腹角腹外侧。该细胞群对应于 Matsushita 和 Ueyama (1973) 的腹侧运动核 (VMN) 的尾部。有趣的是，在腹肌和背阔肌尾部（但不在头侧）注射 HRP 后，VMN 中也存在标记的运动神经元，但在背最长肌注射的病例中则没有。讨论了这些运动神经元是否由于 HRP 泄漏到腹部和尾部背阔肌而被标记的可能性。如果渗漏不是这种情况，VMN 中的运动神经元可能参与腹部肌肉的特定功能，例如所谓的稳态收缩。
Horseradish peroxidase (HRP) injections were made in the rectus abdominis, obliquus externus, obliquus internus, transversus abdominis, cutaneous maximus, latissimus dorsi and the longissimus dorsi muscles in the cat. The results showed that motoneurons innervating the obliquus externus, obliquus internus and transversus abdominis muscles were located in greatly overlapping areas of midthoracic, caudal thoracic and upper lumbar spinal segments. These motoneuronal cell groups were present laterally in the ventral horn and at caudal thoracic and upper lumbar levels they bordered on the white matter. The location of the rectus motoneurons differed somewhat from the location of the other motoneuronal cell groups because they were also present at low cervical and upper thoracic levels and in the segments T12 to L3 they were found in the ventral horn medial to the other abdominal muscle motoneuronal cell group. At mid-thoracic levels rectus motoneurons were located in the same area as the other abdominal muscle motoneurons. Latissimus dorsi motoneurons were observed in a large cell group in the ventrolateral part of the ventral horn at the levels caudal C6 to rostral C8. Furthermore they were found in the segments T9 to L3 laterally in the ventral horn which is the same area in which the other abdominal muscle motoneurons except the rectus ones are located. Longissimus dorsi motoneurons were located in the most ventral portion of the ventral horn in all thoracic and upper 4 lumbar segments. The cutaneous maximus motoneurons wre found in a cell group, located ventrolaterally in the ventral horn at the edge of the gray and white matter at the level caudal C8-rostral T1. This cell group corresponds to the caudal part of the ventral motor nucleus (VMN) of Matsushita and Ueyama (1973). Interestingly, labeled motoneurons were also present in the VMN after injecting HRP in the abdominal muscles as well as in the caudal (but not in the rostral) parts of the latissimus dorsi muscle but not in the longissimus dorsi injected cases. The possibility whether these motoneurons are labeled because of leakage of HRP to abdominal and caudal latissimus dorsi muscles is discussed. If leakage would not be the case, motoneurons in the VMN may be involved in specific functions of the abdominal muscles, such as the so-called steady state contractions.