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相关概念视频

Classification of Bones01:18

Classification of Bones

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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...
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Overview of the Axial Skeleton01:09

Overview of the Axial Skeleton

5.3K
The skeleton is subdivided into two major divisions—the axial skeleton and the appendicular skeleton. The axial skeleton forms the vertical, central axis of the body. It includes all of the bones of the head, neck, chest, and back. It protects the brain, spinal cord, heart, and lungs. It also serves as the attachment site for muscles that move the head, neck, and back and for muscles that act across the shoulder and hip joints to move their corresponding limbs.
The axial skeleton of the...
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Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

2.0K
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
2.0K
Testing a Claim about Mean: Unknown Population SD01:21

Testing a Claim about Mean: Unknown Population SD

3.5K
A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
3.5K
Bone Markings01:26

Bone Markings

5.3K
Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
5.3K
Introduction to the Skeletal System01:20

Introduction to the Skeletal System

5.6K
The skeletal system is the central framework of the body, consisting of different connective tissues: bones, cartilage, tendons, and ligaments.
Components of the Skeletal System
Bone, or osseous tissue, is a hard connective tissue that forms an internal support structure for the human body. Bones shield vulnerable organs and soft tissue from external forces. For example, the vertebral bones protect and support the spinal cord.
Cartilage, a semi-rigid connective tissue found in regions such as...
5.6K

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Author Spotlight: Exploring the Role of Mechanical Signals in Tissue Regeneration Through Atomic Force Microscopy
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在体中对骨皮的比较分析.

Anastasiia Maliuk1,2, Arsalan Marghoub1, Catherine J A Williams3,4,5

  • 1Department of Mechanical Engineering, University College London, London, UK.

Anatomical record (Hoboken, N.J. : 2007)
|February 24, 2024
PubMed
概括

骨皮 (ODs) 是爬行动物的矿化皮肤组织. 这项研究发现,体和物种之间的OD结构存在显著差异,这挑战了简单的保护功能假设.

关键词:
斯克瓦马塔 (Squamata) 是一个小队.生物材料是一种生物材料.生物力学 生物力学材料表征材料的表征.形态学 形态学 形态学爬行动物 爬行动物 爬行动物

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科学领域:

  • 动物学 动物学
  • 比较解剖学的比较解剖学
  • 古生物学的古生物学

背景情况:

  • 骨皮 (ODs) 是许多爬行动物的皮肤中发现的矿化组织.
  • 它们通常被认为是提供保护的,但它们多样化的结构表明它们有不同的功能.

研究的目的:

  • 研究三种物种不同解剖区域的骨皮形态和物质性质的变化.
  • 了解骨皮结构的多样性及其对功能的影响.

主要方法:

  • 来自三种物种的成年的全身CT扫描.
  • 从10个不同的身体区域提取和微型CT扫描单个骨质皮.
  • 使用切割和纳米印记技术对骨皮的表征.

主要成果:

  • 在物种之间和个体内的不同身体位置之间观察到骨皮虫的显著形态和结构多样性.
  • 尖 (Tiliqua gigas) 显示出最一致的外部骨皮形态.
  • 在 *Broadleysaurus major* (Gerrhosauridae) 和 *Tribolonotus novaeguineae* (Scincidae) 中发现了较大的骨皮变异.
  • 之前在其他物种中报告的密集的封闭组织,仅在研究的一种物种 (*B. major*) 中发现.

结论:

  • 的骨皮结构非常复杂和可变,不仅在物种之间,而且在动物体内的个体体内.
  • 这种变化引发了关于骨皮动物的主要功能以及控制其形状和属性的遗传/发育机制的问题.