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Margin of Error01:27

Margin of Error

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The margin of error is also called the maximum error of an estimate. The margin of error is the maximum possible or expected difference between the observed sample parameter value and the actual population parameter value. For proportion, it is the maximum difference between the value of sample proportion obtained from the data and the true value of population proportion. As the true value of the population parameter is not known, the margin of error is calculated using the sample statistic.
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The external iliac artery transitions out of the body cavity, entering the femoral region of the lower leg, and is renamed the femoral artery at the point where it traverses the body wall. This artery is responsible for the distribution of blood to the thigh's deep muscles and the skin's ventral and lateral regions, achieved through several minor branches and the lateral deep femoral artery, which also spawns a lateral circumflex artery. The knee area receives blood from the genicular...
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Arteries, the vasculature responsible for transporting blood from the heart, possess robust walls capable of enduring the elevated pressures exerted by the heartbeat. Arteries near the heart are especially thick-walled and enriched with elastic fibers across their three tunics, classifying them as elastic or conducting arteries. These arteries, usually with a diameter exceeding 10 mm, are characterized by their ability to dilate in response to the blood pumped from the heart's ventricles...
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Arteries of the Upper Limbs01:12

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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...
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Overview of Systemic Arteries01:11

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The human body is a complex, well-organized machine, and at the heart of its operations lies the circulatory system. This network of blood vessels, which includes systemic arteries, plays a vital role in maintaining life by transporting nutrients, oxygen, and waste products to and from cells throughout the body.
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Arteries of the Head and Neck01:26

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The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
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Intraoperative Assessment of Resection Margins in Oral Cavity Cancer: This is the Way
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When the marginal artery is not marginal.

W H Roberts, P C Engen, D A Mitchell

    Anatomischer Anzeiger
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Unusual precolic anastomosing loops of the marginal artery were observed in multiple subjects during dissection. This anatomical variation can complicate surgical assessment of bowel blood supply and potentially impact circulation post-resection.

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    Area of Science:

    • Anatomy
    • Surgical Anatomy
    • Vascular Anatomy

    Background:

    • The marginal artery, a critical component of the colic vascular supply, is typically formed by anastomosing arterial loops.
    • Detailed anatomical variations in this vascular arcade are not always the primary focus during routine dissection.

    Purpose of the Study:

    • To report the unexpected finding of a significant precolic anastomosing loop of the marginal artery.
    • To highlight the potential surgical implications of such anatomical variations.

    Main Methods:

    • Systematic dissection and observation of the colic vasculature.
    • Documentation of anatomical anomalies in multiple human subjects.

    Main Results:

    • A prominent precolic anastomosing loop of the marginal artery was identified in one subject.
    • Similar, though less pronounced, anastomosing loops were observed in two additional subjects.
    • The presence of these loops was unexpected during routine anatomical dissection.

    Conclusions:

    • The observed precolic anastomosing loops represent a notable variation in colic arterial anatomy.
    • This anatomical variation poses challenges for surgical planning, particularly in evaluating blood supply to resected bowel segments.
    • Potential impairment of distal bowel perfusion following resection must be considered due to altered collateral circulation patterns.