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相关概念视频

Assessment of the Cardiovascular System III: Palpation01:27

Assessment of the Cardiovascular System III: Palpation

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Palpation involves feeling the body to evaluate texture, size, consistency, and tenderness for assessing cardiovascular health. The following steps are organized in a head-to-toe order:
Jugular Venous Pressure (JVP) Measurement
Position the patient at a thirty- to forty-five-degree angle or in a semi-fowler's position. Look for the highest point of pulsation in the internal jugular vein and measure the vertical distance to the angle of Loius or sternal angle. A normal JVP is 3-4 cm above...
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Vascular Spasm01:16

Vascular Spasm

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Arteries of the Upper Limbs01:12

Arteries of the Upper Limbs

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The subclavian artery transitions into the axillary artery as it exits the chest and enters the axillary region. This artery is critical for supplying blood to the shoulder area, including the head of the humerus, through the humeral circumflex arteries. As the vessel continues into the upper arm or brachium, it becomes the brachial artery. This artery plays a key role in vascularizing the brachial region and bifurcates at the elbow into several branches. These branches include the deep...
983
Muscles of the Forearm that Move the Hand and Fingers01:17

Muscles of the Forearm that Move the Hand and Fingers

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The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi...
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Somatosensation01:33

Somatosensation

38.4K
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Veins of Upper Limbs01:17

Veins of Upper Limbs

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The human circulatory system, a marvel of biological engineering, is a complex network of vessels that transport blood throughout the body. Among these, the veins responsible for carrying blood from the upper limbs are divided into two categories: deep and superficial.
The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
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相关实验视频

Updated: Sep 9, 2025

Non-invasive Assessment of Microvascular and Endothelial Function
05:41

Non-invasive Assessment of Microvascular and Endothelial Function

Published on: January 29, 2013

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人类手指的血管运动

Pekka Talke, Jonathan S Maltz, Marcus Talke

    Journal of vascular research
    |August 28, 2025
    PubMed
    概括

    这项研究展示了一种记录人手指尖血管运动或血管振荡的方法. 观察到的血管运动与神经活动无关,与α- 2上腺体受体激活有关.

    科学领域:

    • 生理学
    • 血管生物学
    • 药理学

    背景情况:

    • 血管运动是调节血液流动的关键.
    • 之前记录血管运动的方法经常被其他血管信号所混.
    • 开发隔离和研究血管运动的方法对于了解血管控制至关重要.

    研究的目的:

    • 描述和验证记录人类血管运动的方法.
    • 在不同的条件下调查血管运动的特征,包括清醒和麻醉状态.
    • 为了区分血管运动与其他自发的血管振荡.

    主要方法:

    • 在三项研究中,采用光电显微镜记录手指尖的血管运动.
    • 第1项研究涉及接受德克斯梅托米丁的清醒受试者进行化学同情切除.
    • 第2和第3项研究分别对清醒的志愿者和麻醉患者进行了分级输注.

    主要成果:

    • 血管运动频率在0. 020至0. 037赫兹之间被记录.
    • 观察到的血管振荡与神经活动无关.
    • 发现血管运动具有局部性质,并与α- 2上腺体受体激活相关.

    结论:

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    • 描述的光聚体学方法有效地记录了血管运动,没有显著的干扰.
    • 血管运动是血管的内在特性,由α-2-上腺体受体调节.
    • 这种技术为研究临床和研究环境中的血管运动提供了可靠的工具.