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相关概念视频

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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Papillary Dermis01:11

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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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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Layers of the Epidermis01:21

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The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
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Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Cells of the Epidermis01:24

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The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
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人类角膜中中心与外周厚度的解释

Jan P G Bergmanson1, Alan R Burns1, Maria K Walker1

  • 1University of Houston, College of Optometry, Texas Eye Research & Technology Center, 4401 Martin Luther King Boulevard, Houston, TX 77204-2020, United States.

Contact lens & anterior eye : the journal of the British Contact Lens Association
|April 8, 2024
PubMed
概括

人类的角膜在外围是较厚的,这是由于后面片的厚度增加,而不是更多的片. 较大的原纤维体直径也在外围层中观察到.

关键词:
原纤维的原纤维.Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal Stroma Corneal角膜的厚度 角膜的厚度在Lamellae中,它们是的.超结构的超结构

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科学领域:

  • 眼科医生 眼科 眼科
  • 角膜解剖学 角膜解剖学
  • 超结构成像超结构成像

背景情况:

  • 人类的角膜表现出区域厚度的变化,在外围比中央更厚.
  • 人们假设这种外围加厚是由于较多的树叶层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层.

研究的目的:

  • 为了研究外周人角膜厚度增加的解剖基础.
  • 用高分辨率成像来确定是否增加了叶片数或其他因素导致外周角膜加厚.

主要方法:

  • 用光显微镜 (LM) 和传输电子显微镜 (TEM) 分析了人类捐赠者的角膜.
  • 电流区域 (中心,外围前部,中间,后部) 被成像以评估厚度,片状细胞数,片状细胞厚度,原纤维直径和密度.

主要成果:

  • 周边角膜 (536 ± 29 μm) 显著比中央角膜 (415 ± 34 μm) 更厚.
  • 中央地区和外围地区的状虫数量没有显著差异.
  • 周围的后面面膜是~50%更厚的,而周围的原纤维的直径是~30%大于中央的.

结论:

  • 周围角膜的加厚主要是由于后层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层层
  • 虽然外围的原纤维较大,但只有后面的叶片表现出增加的厚度,而不是前面或中间的叶片.