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首页> 外文学位 >The functional morphology of the mammalian corpus cavernosum with special reference to erection in the nine-banded armadillo (Dasypus novemcinctus).
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The functional morphology of the mammalian corpus cavernosum with special reference to erection in the nine-banded armadillo (Dasypus novemcinctus).

机译：哺乳动物海绵体的功能形态，特别涉及九带犰狳（Dasypus novemcinctus）的勃起。

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摘要

This project examines how the morphological design of a hydrostat called the corpus cavernosum within the mammalian penis allows it to inflate to its intromittent shape and increase its flexural stiffness during erection. By examining the gross morphology and histology of flaccid and artificially erected penises from the nine-banded armadillo (Dasypus novemcinctus), I confirmed previous reports that (1) the corpus cavernosum is a biological hydrostat reinforced by an array of collagen fibers arranged at 0;Artificial inflation of armadillo corpora shows that folded tissue and crimped collagen fibers in the wall of the flaccid corpus cavernosum allow it to expand in response to a small (1 kPa) rise in intracavernosal pressure, then increase in stiffness by three to four orders of magnitude at strains larger than 15%. Wall expansion also increases the second moment of area of the corpus cavernosum. Increasing both tissue stiffness and second moment of area contribute to the increase in the flexural stiffness of the corpus cavernosum during erection, although the presence of trabeculae reduces the maximum potential flexural stiffness of the erect corpus cavernosum in favor of protecting the urethra from compression. Once the penis is erect, the axial orthogonal array of collagen fibers gives the corpus cavernosum a fixed shape and size and allows it to resist tensile, compressive, and bending forces.;By examining the gross morphology and histology of corpora from animals in eight additional mammalian orders, I infer that the orthogonal collagen fiber array and the collagenous trabeculae are shared by all therian mammals. Differences in the size of the tunica albuginea's axial orthogonal array and differences in the length and arrangement of the trabeculae may be correlated with length and cross-sectional shape differences in the erect corpora cavernosa among mammalian taxa. The particular shape of the erect corpus cavernosum affects both its relative stiffness to Euler and local buckling and its relative flexural stiffness in different bending planes.
机译：该项目研究了哺乳动物阴茎中称为卵泡海绵体的静水器的形态设计如何使其膨胀为内向形状并在勃起过程中增加其弯曲刚度。通过检查九带状犰狳（Dasypus novemcinctus）的松弛和人工竖起的阴茎的总体形态和组织学，我证实了以前的报道：（1）海绵体是一种生物增液器，由排列为0的胶原纤维阵列增强；犰狳体的人为充气表明，松弛的海绵体壁中折叠的组织和卷曲的胶原纤维使其能够响应海绵体腔内压力的小幅升高（1 kPa）而膨胀，然后使其硬度增加三至四个数量级大于15％的菌株。壁扩张还增加了海绵体区域的第二矩。尽管小梁的存在降低了直立海绵体的最大潜在挠曲刚度，有利于保护尿道免受压迫，但增加组织刚度和面积的第二矩都有助于勃起海绵体的挠曲刚度的增加。阴茎勃起后，胶原纤维的轴向正交排列使海绵体具有固定的形状和大小，并使其能够抵抗拉伸，压缩和弯曲力。;通过检查另外八种动物的动物体的总体形态和组织学我推断，正交的胶原纤维阵列和胶原小梁是所有泰勒族哺乳动物共有的。白膜的轴向正交阵列的大小的差异以及小梁的长度和排列的差异可能与哺乳动物类群中直立海绵体的长度和横截面形状的差异有关。直立的海绵体的特殊形状会影响其对欧拉和局部屈曲的相对刚度以及在不同弯曲平面中的相对挠曲刚度。

著录项

  • 作者

    Kelly, Diane Alyssa.;

  • 作者单位

    Duke University.;

  • 授予单位 Duke University.;
  • 学科 Biology Anatomy.;Biology Zoology.;Applied Mechanics.;Biology Animal Physiology.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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