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Related Concept Videos

Papillary Dermis01:11

Papillary Dermis

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Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
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Reticular Dermis01:15

Reticular Dermis

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The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
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Classifying Matter by Composition03:35

Classifying Matter by Composition

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
A mixture is composed of two or...
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Decision Making: Traditional Method01:14

Decision Making: Traditional Method

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The process of hypothesis testing based on the traditional method includes calculating the critical value, testing the value of the test statistic using the sample data, and interpreting these values.
First, a specific claim about the population parameter is decided based on the research question and is stated in a simple form. Further, an opposing statement to this claim is also stated. These statements can act as null and alternative hypotheses, out of which a null hypothesis would be a...
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Composite Bodies00:55

Composite Bodies

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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
Composite bodies have widespread applications in mechanical engineering, from automobiles to aircraft to rockets. For example, an automobile wheel comprises...
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Composition of Blood01:22

Composition of Blood

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The blood in our bodies comprises three major components: blood plasma, formed elements, and the extracellular matrix. Blood plasma is a yellowish fluid that constitutes 55% of the total blood volume. It is primarily made up of water and essential substances such as electrolytes and proteins. Blood plasma serves as a medium for transporting blood cells and also contains nutrients, enzymes, hormones, antibodies, and gases.
Formed elements constitute the remaining 45% of the blood volume. These...
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Related Experiment Video

Updated: Feb 15, 2026

An Experimental Human DIEP Flap Model to Investigate Preservation Strategies for Vascularized Composite Allografts and Free Flaps
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Artificial Dermis Composite Tissue Flaps versus Traditional Prefabricated Flaps.

Yuchong Wang, Mengyan Sun, Haiying Dai

    Journal of the American Podiatric Medical Association
    |January 12, 2018
    PubMed
    Summary

    Artificial dermis composite tissue flaps show comparable results to traditional flaps for repairing exposed bone and tendon injuries in rats. These artificial flaps demonstrated superior blood perfusion and thickness, suggesting they may be a better alternative for tissue repair.

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    Area of Science:

    • Regenerative Medicine
    • Tissue Engineering
    • Orthopedic Surgery

    Background:

    • Exposed bone and tendon injuries pose significant challenges in reconstructive surgery.
    • Traditional prefabricated flaps are a common method for covering such defects.
    • The development of advanced biomaterials like artificial dermis offers potential improvements in tissue repair.

    Purpose of the Study:

    • To compare the efficacy of artificial dermis composite tissue flaps versus traditional prefabricated flaps.
    • To evaluate flap performance in a rat model of exposed bone and tendon injury.
    • To assess the potential of artificial dermis as a superior alternative for complex wound repair.

    Main Methods:

    • A randomized study involving Sprague Dawley rats (n=40 per group).
    • Group A received artificial dermis composite tissue flaps; Group B received traditional prefabricated flaps.
    • Comparative analysis of flap appearance, range of motion, swelling, histology, and imaging over 28 days.

    Main Results:

    • No significant differences were observed in flap appearance, range of motion, or swelling between the groups.
    • Artificial dermis composite flaps exhibited enhanced blood perfusion compared to traditional flaps.
    • Histological analysis revealed greater thickness in the artificial dermis composite flaps.

    Conclusions:

    • Artificial dermis composite tissue flaps are a viable and potentially superior option for repairing exposed bone and tendon injuries.
    • These flaps demonstrate comparable functional outcomes to traditional methods with improved biological characteristics.
    • The study suggests artificial dermis composite flaps as an ideal alternative for complex tissue defect reconstruction.