Brink E E, Modianos D T, Pfaff D W
Brain Behav Evol. 1980;17(1):67-88. doi: 10.1159/000121791.
Ablations of lateral longissimus, medial longissimus, and the lumbar transversospinalis system were performed singly and sequentially on female albino rats. Animals were tested postoperatively with males and by manual stimulation for lordosis. In tests with males, the strength of lordosis was rated specifically with respect to the extent of rump elevation; in manual stimulation tests, rating was based on the full lordotic response. Animals were also tested for the ability to cross a balance beam as an indication of the general status of the animals' posture and locomotion. The data from tests with males proved more sensitive in showing up effects of the ablations on lordosis. Lateral longissimus ablations and transversospinalis ablations led predictably to worsened lordosis. Medial longissimus ablations did not significantly affect lordosis. The manual stimulation data were consistent with the data obtained in tests with males. Ablated animals were not impaired on the balance beam test. The results indicate that lateral longissimus and the lumbar transversospinalis system are major participants in the rump elevation of lordosis, an early and biologically important component of the lordotic response. This information permits focus on lateral longissimus and the lumbar transversospinalis system in the investigation of the neural control of lordosis.
对雌性白化大鼠依次单独进行了外侧最长肌、内侧最长肌和腰段横突棘肌系统的切除手术。术后对动物与雄性进行测试，并通过手动刺激来检测脊柱前凸情况。在与雄性的测试中，根据臀部抬高的程度对脊柱前凸的强度进行具体评分；在手动刺激测试中，评分基于完整的脊柱前凸反应。还测试了动物穿越平衡木的能力，以此作为动物姿势和运动总体状况的指标。来自与雄性测试的数据在显示切除手术对脊柱前凸的影响方面更具敏感性。外侧最长肌切除和横突棘肌切除可预见地导致脊柱前凸恶化。内侧最长肌切除对脊柱前凸没有显著影响。手动刺激数据与在与雄性测试中获得的数据一致。接受切除手术的动物在平衡木测试中未受损害。结果表明，外侧最长肌和腰段横突棘肌系统是脊柱前凸中臀部抬高的主要参与者，而臀部抬高是脊柱前凸反应早期且具有生物学重要性的组成部分。这些信息使得在研究脊柱前凸的神经控制时能够聚焦于外侧最长肌和腰段横突棘肌系统。
