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相关概念视频

Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

13.2K
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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Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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The Sarcomere01:08

The Sarcomere

7.8K
A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each...
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Skeletal Muscle Anatomy00:55

Skeletal Muscle Anatomy

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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.
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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:
1.8K
Gross Anatomy of Skeletal Muscles01:12

Gross Anatomy of Skeletal Muscles

11.9K
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,...
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相关实验视频

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A Rapid Automated Protocol for Muscle Fiber Population Analysis in Rat Muscle Cross Sections Using Myosin Heavy Chain Immunohistochemistry
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肌肉组成和功能上的差异:探索CT解剖点和SARC-F组件

Janaína Oliveira de Araújo1, Maria Karolainy do Nascimento1, Amanda de Sousa Rebouças1

  • 1Postgraduate Program in Health Sciences, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil.

Nutrition (Burbank, Los Angeles County, Calif.)
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概括

这项研究发现,较低的骨肌肉辐射密度 (SMD) 表明肌肉构成不佳,与癌症患者的肉症风险较高有关. 在特定的身体部位较低的SMD与SARC-F问卷结果相关.

关键词:
解剖学上的地标.肌肉质量 肌肉质量 肌肉质量质量质量的肌肉质量.肌肉辐射密度是指肌肉的辐射密度.查萨尔科佩尼亚的查

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Author Spotlight: Isolation of Long Muscle Fibers from Mouse Hindlimb Muscles for Studying Excitation-Contraction Coupling Across Fiber Types
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Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions
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相关实验视频

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A Rapid Automated Protocol for Muscle Fiber Population Analysis in Rat Muscle Cross Sections Using Myosin Heavy Chain Immunohistochemistry
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Author Spotlight: Isolation of Long Muscle Fibers from Mouse Hindlimb Muscles for Studying Excitation-Contraction Coupling Across Fiber Types
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Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions
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Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

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科学领域:

  • 在瘤学瘤学.
  • 老年病的医生 老年病的医生
  • 放射学 放射学是一门学科.
  • 营养 营养 营养 营养 营养

背景情况:

  • 标志着肌肉损失和肌肉衰弱的萨尔科佩尼亚显著影响癌症患者的治疗结果.
  • SARC-F问卷是一个查软骨的查工具,但其与客观肌肉参数的相关性需要进一步调查.
  • 计算机断层扫描 (CT) 扫描为肌肉组成和形态学提供了详细的见解.

研究的目的:

  • 为了研究癌症患者在SARC-F组件之间肌肉参数的差异.
  • 使用CT衍生地标探索SARC-F得分和肌肉参数之间的关系.
  • 评估骨肌肉 (SM) 截面积,SM指数和SM辐射密度 (SMD) 与肉症指标相关.

主要方法:

  • 对128名癌症患者的横截面分析,这些患者有可用的CT扫描.
  • 用于评估肌肉功能的SARC-F问卷 (得分≥4表明状态不佳).
  • CT测量SM横截面积,SM指数和SMD在L3,大腿和部区域.

主要成果:

  • 具有SARC-F评分≥4的患者在所有评估的基准上显示出显著较低的SMD.
  • 在L3下方的SMD与力量,行走和爬楼梯的困难有关.
  • 在部和大腿水平上较低的SMD与爬楼梯困难有关.
  • 部水平的SMD与SARC-F总体得分独立相关.

结论:

  • 肌肉构成差,以较低的SMD为证据,与癌症患者的肉类症风险更高有关.
  • 来自CT的肌肉参数,特别是SMD,可以识别患肌肉功能不佳风险的个体.
  • 这些发现凸显了CT成像在瘤学环境中评估肉症的实用性.