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将CT-HRP分别注入家兔的胸锁乳突肌和斜方肌内,以研究脊髓内标记神经元的节段分布。实验结果表明,胸锁乳突肌和斜方肌运动神经元位于脊髓颈段前角内,并分为两个独立的细胞柱。胸锁乳突肌运动神经元位于C_1和C_2节段的前角背内侧区,主要分布于C_1节段的尾侧半和C_2节段的吻侧半;神经元胞体平均直径为36.7μm。斜方肌运动神经元位于C_2～C_3节段的前角腹外侧区,主要分布于C_3和C_4节段;神经元胞体平均直径为29.3μm,比胸锁乳突肌神经元略小。胸锁乳突肌和斜方肌运动神经元的树突向四周伸展,广布于灰质后角的基底部、中间带和前角内,并延伸到白质的侧索内。其中最显而易见的是胸锁乳突肌神经元树突伸向中央管周灰质和白质前索,此结果为讨论胸锁乳突肌和斜方肌的不同功能作用提供了形态学基础。
The CT-HRP were injected into the sternocleidomastoid and trapezius of rabbits to study the segmental distribution of labeled neurons in the spinal cord. The experimental results show that the sternocleidomastoid and trapezius muscle motor neurons are located in the anterior horn of cervical cervical segment and are divided into two independent cell columns. The sternocleidomastoid motor neurons were located in the dorsal medial anterior horn of C_1 and C_2 segments and mainly distributed in the caudal halves of C_1 and C_2 segments. The average diameter of neurons was 36.7μm. The trapezius muscle motor neurons located in the anterior horn ventral region of C_2 ~ C_3 segments and mainly distributed in C_3 and C_4 segments. The mean diameter of neurons was 29.3 μm, which was slightly smaller than that of sternocleidomastoid muscle. The dendrites of the sternocleidomastoid and trapezius motoneurons extend around the base of the posterior horn of the gray matter, in the middle zone and in the anterior horn, and extend into the lateral cords of the white matter. The most obvious of these is the dendrites of the sternocleidomastoid neurons projecting to the central perivascular gray matter and white matter precursors, providing the morphological basis for discussing the different functional roles of sternocleidomastoid and trapezius muscles.