Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
https://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2mentary system. In humans, skin derivatives indude nails hair, and several types of sweat ansi sebaceous glands. Ihc surfaces of the body arc covered cither by thin skin or thick skin. skin, or integument, consists of two distinct regions the superficial epidermis and a deep dermis. Tire surface lay Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2er of the skin, or the epidermis, is nonvascular and is lined by keratinized stratified squamous epithelium with distinct cell types and different celEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
l layers. Inferior to the epidermis is the vascular dermis, characterized by dense irregular connective tissue, blood vessels, nerves, and different ghttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2connective (issue and adipose tissue that forms the superficial fascia seen in gross anatomy.Dennis: Papillary and Reticular LayersDermis is the inferior connective tissue layer that binds to the epidermis. A distinct basement membrane separates the epidermis from (he dermis. In addition, (he dermis Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2 contains epidermal derivatives, such as the sweat glands, sebaceous glands, and hair follicles.The junction of the dermis with the epidermis is irregEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
ular. Hie superficial layer of the dermis forms numerous raised projections called dermal papillae, which interdigitate with evaginations of the epidehttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2illaries, blood vessels, fibroblasts, macrophages, and other loose connective tissue cells.I he deeper layer of the dermis is called the reticular layer. This layer is thicker and is characterized by dense irregular connective tissue fibers (mainly type I collagen) and is less cellular than the papi Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2llary layer. Also, this layer of the dermis can withstand more mechanical stresses and can provide support for nerves, blood vessels, hair follicles,Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
and all the sweat glands. There is no distinct boundary between the two dermal layers, and the papillary layer blends with the reticular layer. Also, https://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2tissue of the dermis is highly vascular and contains numerous blood vessels, lymph vessels, and nerves. Certain regions of the skin exhibit arteriovenous anastomoses used for temperature regulation. Here, hlood passes directly from the arteries into the veins. In addition, the dermis contains numero Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2us sensory receptors. Meissner corpuscles are located closer to the surface of the skin In dermal papillae, whereas Pacinian corpuscles are found deepEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
er in the connective tissue of the dermis (Overview Fig. 12.1).261262 PART IVI SystemsFUNCTIONAL CORRELATIONS 12.1 Epidermal Cells and Cell LayersTherhttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2rgo keratinization, or cornification, and form the protective epidermal and surface layer for the skin. The epidermis is composed of stratified keratinized squamous epithelium. There are other less abundant cell types in the epidermis. These are the melanocytes. Langerhans cells, and Merkel cells, w Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2hich are interspersed among the keratinocytes in the epidermis. In thick skin, five distinct and recognizable cell layers can be identified.Stratum BaEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
sale (Germlnatlvum)—The Deepest LayerThe stratum basale is the deepest or basal layer in the epidermis. It consists of a single layer of columnar to chttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2ed desmosomes, and to the underlying basement membrane by hemidesmosomes. Cells in the stratum basale serve as stem cells for the epidermis; thus, much increased mitotic activity is seen in this layer. The cells continually divide and mature as they migrate up toward the superficial layers. All cell Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2s in the stratum basale produce and contain Intermediate keratin filaments that increase in number as the cells move superficially. These filaments evEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
entually form the components of keratin in the superficial cell layer.Stratum Splnosum—The Second LayerAs the keratmocytes divide by mitosis, they movhttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2ine histologic preparations with different chemicals cause those cells to shrink. As a result, the developed intercellular spaces between cells appear to form numerous cytoplasmic extensions, or spines, that project from their surfaces. The spines represent the sites where desmosomes are anchored to Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2 bundles of intermediate keratin filaments, or tonofilaments, and to neighboring cells. The synthesis of keratin filaments continues in this layer, anEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
d they are assern bled into bundles of tonofilaments. Tonofilamcnts maintain cohesion among cells and provide resistance to the abrasion of the epiderhttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2hilic keratohyalln granules and form the third layer, the stratum gtanulosum. Three to five layers of flattened cells form this layer. The secretory granules arc not surrounded by a membrane and consist of the protein filaggrln, which associates and cross-links with bundles of keratin tonofilaments. Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2 The combination of keratin tonotilaments with the filaggrin protein of keratohyalm granules produces keratin through the process called keratinizatioEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
n. The keratin formed by this process is the soft keratin of the skin. In addition, the cytoplasm in the cells of stratum granulosum contains membranehttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2losum and the next layer, the stratum corneurn (or stratum lucidum if present), as a lipid that forms an impermeable water barrier and seals the skin.Stratum Lucidum—The Fourth LayerIn thick skin only, the stratum lucidum is translucent and barely visible; it lies just superior to the stratum granul Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2osum and inferior to the stratum corneum. The tightly packed cells lack nuclei or organelles and are dead. The flattened cells contain densely packedEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
keratin filaments.CHAPTER L| ..FUNCTIONAL CORRELATIONS 12.1 Epidermal Cells and Cell Layers (Continued)Stratum Corneum—The Fifth LayerThe stratum cornhttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2 of flattened, dead cells filled with soft keratin filaments. The keratinized, superficial cells from this layer are continually shed, or desquamated, and are replaced by new cells arising from the deep stratum basale. During the keratimzation process, the hydrolytic enzymes disrupt the nucleus and Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2all cytoplasmic organelles, which disappear as the cells fill with keratin.Other Skin CeltsIn addition to the kcratinocytcs thill form and become theEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
superficial layer of keratinized epithelium, the epidermis also contains three less abundant cell types. These arc melanocytes, Langerhans cells, and https://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2ematoxylin and cosin.Melanocytes arc derived from the neural crest cells. They have long, irregular cytoplasmic or dendritic extensions that branch into the epidermis. Melanocytes are located between the stratum basalc and the stratum spinosum of the epidermis and synthesize the dark brown pigment m Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2elanin. Melanin is synthesized from the amino acid tyrosine by melanocytes. Tie formed melanin granules in the melanocytes then migrate to their cytopEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
lasmic extensions, from which they are transferred to keralinocytes in the basal cell layers of the epidermis. Melanin imparts a dark color to the skihttps://khothuvien.cori!A\ »Integumentary SystemGeneral OverviewSkin is the largest organ in the body. Its derivatives and appendages form the integum Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2 effects of ultraviolet radiation.Langerhans cells originate from bone marrow, migrate via the bloodstream, and reside in the skin, mainly in the stratum spinosum. These dendritic-type cells participate in the body’s inuntuir responses. Langerhans cells recognize, phagocylose, and process foreign an Ebook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2tigens and then present them to T lymphocytes for an immune response. T1US, these cells function as antigen-presenting cells and arc part of the immunEbook diFiore''s atlas of histology - With functional correlations (12th edition): Part 2
ologic defense of the skin.Merkel cells are found in the stratum basale layer of the epidermis and are most abundant in the fingertips. Because theseGọi ngay
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