这关键区别在表皮和真皮之间表皮是皮肤的最外层或上层,而真皮是位于表皮下方的皮肤的内层。
鸟类和哺乳动物是吸热动物。为了保持恒定的体温,这些生物需要具有高代谢率和控制体面热量损失的有效手段。皮肤是人体的器官,在监测和调节温度变化时与外部环境接触。实际上,它是脊椎动物的外覆盖。它包含结缔组织, blood vessels,sweat glandsand sense cells, which carry out numerous functions. The human skin has two main layers as epidermis and dermis, which overlay the subcutaneous fat-containingadipose tissues。
CONTENTS
1。概述和关键差异
2。What is Epidermis
3。What is Dermis
4。表皮和真皮之间的相似之处
5。Side by Side Comparison – Epidermis vs Dermis in Tabular Form
6.Summary
What is Epidermis?
Epidermis is one of the two layers of the skin. In fact, it is the outermost layer of skin which is embryonic ectodermal in origin. It is separated from the dermis (inner layer) by a basement membrane. Most importantly, it forms a complete covering to the body perforated only by sweat gland openings and hair follicles.
表皮有许多细胞层,形成了分层的鳞状上皮。基底细胞层具有立方体细胞。外层具有鳞状的角化细胞。此外,表皮具有四到五层上皮细胞。这些层是层基层,脊柱层,颗粒层,角质层和露西层。
![Difference Between Epidermis and Dermis 1 表皮和真皮之间的差异](https://i0.wp.com/m.mcpcourse.com/wp-content/uploads/2011/10/Difference-Between-Epidermis-and-Dermis_Figure-1.jpg?resize=556%2C345&ssl=1)
图01:表皮和真皮
Furthermore, stratum basale is the deepest epidermal cell layer composed of a single layer of cuboidal cells. It is attached to the basal lamina. Stratum spinosum comprises eight to ten layers of keratinocytes. Keratinocytes synthesize keratin, which is a protein that makes cells waterproof. As the keratin content in cells increases, they get cornified and die. They also can be modified as nails, claws, hooves, feathers and hair in animals. Moreover, stratum corneum is the most superficial layer of the epidermis and it is in contact with the external environment. Its cells are dry and mostly dead. Cells of the stratum corneum are subject to periodic shedding. The below layer – stratum granulosum – replaces the cells of the stratum corneum.
什么是真皮?
真皮是皮肤的内层,主要是中胚层的。它是一个密集的基质,由富含弹性纤维的结缔组织组成,并含有血液毛细血管,淋巴管,肌肉纤维,色素呼叫,汗腺和毛囊。
此外,毛囊起源于表皮,从真皮中起泡,从真皮中的血毛细血管中获取滋养。皮脂腺露出毛囊,分泌皮脂。皮脂使皮肤保持湿润,并防止皮肤流失。在毛囊的底部,有一个平滑肌,称为到达pili肌肉。它有助于改变头发的位置以及被困在头发和皮肤之间的空气量。因此,它也执行热调节功能。真皮中的汗腺会产生汗水,并有助于执行功能以及热调节功能。
此外,真皮中既有运动神经元和感觉神经元。感觉神经元检测热,冷,触摸,疼痛和压力。真皮中存在的血液毛细血管通过扩散向真皮和表皮的活部分提供了氧气和氧气。
表皮和真皮之间有什么相似之处?
- 表皮和真皮是动物的保护细胞覆盖物。
- 它们是使皮肤变成的两层。
- 此外,真皮位于表皮下。
表皮和真皮有什么区别?
表皮和真皮之间的关键区别在于表皮是最外层的,而真皮是内层。此外,真皮是中胚层的,而表皮的起源是外胚层。此外,表皮会修饰形成头发,指甲,羽毛,鹿角,蹄等,而真皮则没有。这是表皮和真皮之间的另一个区别。
表皮既由生活和非生命组成部分组成,但真皮完全活着。这是表皮和真皮之间的重要区别。此外,真皮包含腺毛细血管,光滑肌肉,色素细胞和神经,而表皮没有这些元素。表皮和真皮之间的另一个区别是,表皮不断脱落细胞,而真皮无法脱落细胞。
摘要 - 表皮与真皮
真皮和表皮形成两层basic body covering or the skin. Together, they perform the function of protecting internal organs from damage, dehydration, and disease. The cornified epidermis prevents damage by friction, while the dermis and subcutaneous tissues prevent mechanical damage. Melanin, the dark pigment in chromatophores of the dermis, protects the body from UV radiation. Moreover, the sebum and structure of the skin itself prevent the entry of pathogens. This summarizes the difference between epidermis and dermis.
参考:
1.“表皮”。百科全书,lubopitko,在这里可用。
图片提供:
1. formal_epidermis_and_ddermis_with_intrardermal_nevus_10x.jpg:kilbadcropped和由fama clamosa(Talk)和MikaelHäggström(通过公共域)(通过公共域)(通过公共域)(kilbadcropped)(kilbadcropped)(kilbadcropped)(kilbadcropped)(kilbadcropped)(kilbadcropped)(kilbadcropped)(kilbadcropped)(kilbadcropped)下议院维基梅迪亚
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