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相关概念视频

Skeletal Muscle Anatomy00:55

Skeletal Muscle Anatomy

94.4K
Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
94.4K
Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

60.0K
Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
60.0K
Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

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Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
4.4K
Gross Anatomy of Skeletal Muscles01:12

Gross Anatomy of Skeletal Muscles

22.8K
The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
22.8K
Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

26.3K
Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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相关实验视频

Updated: Mar 18, 2026

Three-Dimensional Shape Modeling and Analysis of Brain Structures
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Three-Dimensional Shape Modeling and Analysis of Brain Structures

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三维肌肉形状中的性别差异:使用统计形状建模从性二重形态解脱异构.

Jun Umehara1,2, Masashi Taniguchi2, Masahide Yagi1,2

  • 1Faculty of Rehabilitation, Kansai Medical University, Hirakata, Japan.

Scandinavian journal of medicine & science in sports
|March 17, 2026
PubMed
概括

这项研究使用统计形状建模来分析人类四头四腿肌肉. 虽然大多数肌肉形状的性别差异是由于大小 (全度),但在男性和女性之间确立了明显的内在形状变化.

关键词:
所有度测法 (allometry) 是一种全度测法.生物力学 生物力学形态学 形态学 形态学性二态性质性质二态性质性质二态性质统计形状模型是一个统计形状模型.

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3D Ultrasound Imaging: Fast and Cost-effective Morphometry of Musculoskeletal Tissue

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Skeletal Muscle Gender Dimorphism from Proteomics
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科学领域:

  • 人类解剖学 人类解剖学
  • 生物力学 生物力学
  • 形态测量法 形态测量法 形态测量法

背景情况:

  • 性二态性观察到骨肌肉的大小和形状.
  • 从性二形态学中解脱全度效应对于理解人类肌肉中与性别相关的形状差异至关重要,但仍然未得到充分探索.

研究的目的:

  • 为了识别人类四头四腿肌的形状的性别差异.
  • 利用统计形状建模来实现一种新的肌肉形态分析方法.
  • 为了区分性别之间的尺寸驱动 (全度) 和内在形状变化.

主要方法:

  • 从43名健康的年轻成年人 (22名男性,21名女性) 获得磁共振图像.
  • 测量四个四肢骨头的肌肉大小 (体积,横截面积,长度,宽度,厚度).
  • 开发统计形状模型来量化肌肉形状变化,并通过线性歧视进行性别分类.

主要成果:

  • 与女性相比,男性的肌肉体积,横截面积,长度,宽度和厚度显著增加.
  • 统计形状模型揭示了与性别相关的形状差异,在考虑肌肉体积 (全量计) 后保留了一些明显的变化.
  • 超大侧体和超大中间体中的特定区域显示出与性别相关的独特形状差异,使得精确的性别分类成为可能.

结论:

  • 大多数观察到的四头四腿骨形状的性别差异归因于整体尺寸差异 (全度学).
  • 在男性和女性四头骨肌之间存在内在的,与大小无关的形状差异.
  • 统计形状建模是一种有价值的工具,用于在肌肉形态学中区分全度效应与真实性二态.