Hello-hello!
It’s high time we revised the anatomy of the human body!
Let’s start with the largest organ – skin!
The three layers of the skin, from superficial to deep, include:
📌 epidermis
📌 dermis
📌 hypodermis
Let’s focus on epidermis first:
📌The epidermis is the outermost layer of the skin, providing a protective barrier against external factors. It is a stratified epithelium composed of several layers, each with distinct functions. These layers include:
⚡️Stratum Basale (Basal Layer): The innermost layer constantly produces new skin cells through cell division. Melanocytes, responsible for melanin production, are also present in this layer.
⚡️Stratum Spinosum: 2nd layer, comprises 8-10 keratinocyte cell layers which can no longer divide. Keratinocytes are connected by desmosomes, providing strength and flexibility to the skin.
⚡️Stratum Granulosum: 3rd layer, where keratinocytes begin to flatten and lose their nuclei (process called keratinization). The stratum granulosum plays a crucial role in lipid production, contributing to skin hydration.
⚡️Stratum Lucidum: Found in areas of thick skin, such as the palms and soles, the stratum lucidum is a translucent layer composed of flattened, clear, and densely packed keratinocytes. It enhances the skin's resilience in regions subjected to mechanical stress.
⚡️Stratum Corneum: The outermost layer, consists of dead skin cells (keratinocytes) that have undergone keratinization. This layer forms a protective barrier, preventing water loss and external threats.
📎 source: Rook's Textbook of Dermatology, 4 Volume Set, 9th Edition
It’s high time we revised the anatomy of the human body!
Let’s start with the largest organ – skin!
The three layers of the skin, from superficial to deep, include:
📌 epidermis
📌 dermis
📌 hypodermis
Let’s focus on epidermis first:
📌The epidermis is the outermost layer of the skin, providing a protective barrier against external factors. It is a stratified epithelium composed of several layers, each with distinct functions. These layers include:
⚡️Stratum Basale (Basal Layer): The innermost layer constantly produces new skin cells through cell division. Melanocytes, responsible for melanin production, are also present in this layer.
⚡️Stratum Spinosum: 2nd layer, comprises 8-10 keratinocyte cell layers which can no longer divide. Keratinocytes are connected by desmosomes, providing strength and flexibility to the skin.
⚡️Stratum Granulosum: 3rd layer, where keratinocytes begin to flatten and lose their nuclei (process called keratinization). The stratum granulosum plays a crucial role in lipid production, contributing to skin hydration.
⚡️Stratum Lucidum: Found in areas of thick skin, such as the palms and soles, the stratum lucidum is a translucent layer composed of flattened, clear, and densely packed keratinocytes. It enhances the skin's resilience in regions subjected to mechanical stress.
⚡️Stratum Corneum: The outermost layer, consists of dead skin cells (keratinocytes) that have undergone keratinization. This layer forms a protective barrier, preventing water loss and external threats.
📎 source: Rook's Textbook of Dermatology, 4 Volume Set, 9th Edition