Anatomy lecuture 4
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Questions and Answers

What function does the skin NOT perform in relation to waste management?

  • Eliminates metabolic wastes through sweat
  • Aids in removing heavy metals from the body
  • Absorbs toxins from the environment (correct)
  • Converts chemicals into carcinogens
  • Which layer of skin is formed first during embryonic development?

  • Periderm (correct)
  • Basal layer
  • Stratum germinativum
  • Dermis
  • Which cell type arises from neural crest cells and is responsible for pigment production?

  • Fibroblasts
  • Melanoblasts (correct)
  • Mesenchymal cells
  • Keratinocytes
  • What is the primary role of keratinocyte enzymes in the context of cancer and inflammation?

    <p>Disarm carcinogenic chemicals</p> Signup and view all the answers

    What is the primary composition of the vernix caseosa that protects fetal skin?

    <p>Sebum, dead skin cells, and lanugo hair</p> Signup and view all the answers

    What is the primary function of the subcutaneous layer of the skin?

    <p>Binds skin to underlying tissues</p> Signup and view all the answers

    What is the primary function of the papillary layer of the dermis?

    <p>Increases surface area for nutrient exchange</p> Signup and view all the answers

    Which type of tissue primarily makes up the epidermis?

    <p>Stratified squamous epithelium</p> Signup and view all the answers

    How do keratinocytes receive nutrients and oxygen?

    <p>By diffusion from dermal vessels</p> Signup and view all the answers

    Which of the following is NOT a function of the integument?

    <p>Psychological signaling to indicate mood</p> Signup and view all the answers

    Which specialized cell is found in the papillary layer of the dermis and is responsible for touch sensation?

    <p>Meissner’s corpuscle</p> Signup and view all the answers

    Which cells play a significant role in the immune defense of the skin?

    <p>Dendritic cells</p> Signup and view all the answers

    What is the main role of melanocytes in the skin?

    <p>To produce melanin</p> Signup and view all the answers

    What type of connective tissue makes up the reticular layer of the dermis?

    <p>Dense irregular connective tissue</p> Signup and view all the answers

    Which layer of the epidermis contains Merkel cells that are associated with touch sensation?

    <p>Stratum basale</p> Signup and view all the answers

    Which layer of the skin is avascular?

    <p>Epidermis</p> Signup and view all the answers

    What role does the reticular layer NOT serve in the skin's function?

    <p>Assisting in energy storage</p> Signup and view all the answers

    What is the composition of melanin responsible for skin color?

    <p>Eumelanin and pheomelanin</p> Signup and view all the answers

    Which of the following layers directly provides vascular supply to the epidermis?

    <p>Papillary layer</p> Signup and view all the answers

    Which of the following layers is directly connected to the dermis?

    <p>Stratum basale</p> Signup and view all the answers

    What are epidermal ridges and dermal papillae primarily responsible for?

    <p>Grip and friction</p> Signup and view all the answers

    Which of the following is NOT a metabolic function of the integument?

    <p>Insulation of body temperature</p> Signup and view all the answers

    Which is NOT a characteristic of the epidermis?

    <p>Directly vascularized with blood vessels</p> Signup and view all the answers

    Which layer of the epidermis is primarily responsible for the production of keratin and the formation of epidermal ridges?

    <p>Stratum Basale</p> Signup and view all the answers

    What unique characteristic is associated with keratinocytes in the stratum spinosum?

    <p>They have a spiny appearance due to desmosomes.</p> Signup and view all the answers

    In which layer are keratohyalin granules primarily accumulated, aiding in keratin formation?

    <p>Stratum Granulosum</p> Signup and view all the answers

    What is the primary function of the stratum lucidum?

    <p>It provides additional protection against friction.</p> Signup and view all the answers

    What distinguishes keratinocytes in the stratum corneum from those in other layers?

    <p>They are dead and anucleate.</p> Signup and view all the answers

    What type of cells are primarily involved in immune defense within the spiny layer of the epidermis?

    <p>Langerhans cells</p> Signup and view all the answers

    How does albinism primarily affect individuals?

    <p>By significantly decreasing melanin production.</p> Signup and view all the answers

    Which layer of the epidermis is the last that contains living cells?

    <p>Stratum Granulosum</p> Signup and view all the answers

    What contributes to the waterproof barrier in the skin?

    <p>Lipids released by lamellar bodies</p> Signup and view all the answers

    Which specific locations in the body contain the stratum lucidum?

    <p>Palms and soles only</p> Signup and view all the answers

    What is the primary function of the TYR gene in melanocytes?

    <p>To code for tyrosinase, which is crucial for melanin production</p> Signup and view all the answers

    What results in the characteristic appearance of individuals with albinism?

    <p>Normal melanocyte number with defective melanin production</p> Signup and view all the answers

    Which exteroceptor type is primarily responsible for detecting light touch?

    <p>Meissner corpuscles</p> Signup and view all the answers

    What role does the skin play in vitamin D synthesis?

    <p>It converts 7-dehydrocholesterol to cholecalciferol upon UV exposure</p> Signup and view all the answers

    In which layer of the skin is fat primarily stored?

    <p>Hypodermis</p> Signup and view all the answers

    How does vitiligo differ from albinism?

    <p>Vitiligo involves loss of melanocytes in patches, while albinism affects all skin areas</p> Signup and view all the answers

    Which sensory receptor is specialized for detecting pressure and vibration?

    <p>Pacinian corpuscles</p> Signup and view all the answers

    What primary function does the integument serve with regards to blood?

    <p>It acts as a blood reservoir containing about 5% of total blood volume</p> Signup and view all the answers

    Which of the following correctly describes a function of the integument related to lipid metabolism?

    <p>Production of ceramides to maintain skin barrier function</p> Signup and view all the answers

    Study Notes

    Functions of the Integument

    • Protection: Acts as a physical barrier and initiates immune responses.
    • Sensory function: Detects various stimuli.
    • Thermoregulation: Helps maintain body temperature.
    • Metabolic functions: Involves vitamin D synthesis, energy storage, and electrolyte removal via sweat.
    • Sexual signaling: Indicates health status and releases sex pheromones.

    Layers of the Integument

    Epidermis

    • Composed of stratified squamous epithelium, avascular, and derives from ectoderm.
    • Home to keratinocytes, which produce keratin and migrate to the surface.
    • Receives nutrients and oxygen via diffusion from dermal blood vessels.
    • Interlocked with the dermis through epidermal ridges and dermal papillae, important for grip.

    Dermis

    • Connective tissue layer derived from mesoderm containing blood vessels.
    • Papillary Layer: Composed of loose connective tissue, contains dermal papillae and capillaries for nutrient supply; houses sensory receptors.
    • Reticular Layer: Denser layer providing structural support, contains collagen, elastin fibers, blood vessels, sweat, and sebaceous glands.

    Subcutaneous Layer

    • Consists of loose areolar connective tissue and adipose tissue.
    • Binds skin to underlying tissues and serves as a storage site for fat.

    Specific Layers of the Epidermis and Keratinization

    • Stratum Basale: Deepest layer, consists of keratinocyte stem cells and melanocytes; responsible for cell production.
    • Stratum Spinosum: Thickest layer, contains keratinocytes connected via desmosomes; beginning of keratin production.
    • Stratum Granulosum: 3-5 layers of alive keratinocytes; accumulates keratohyalin granules important for waterproof barrier.
    • Stratum Lucidum: Present in thick skin areas (e.g., palms and soles); provides an additional friction barrier.
    • Stratum Corneum: Outermost layer with dead, keratinized cells; forms a strong protective barrier.

    Albinism and Melanocytes

    • Albinism: Genetic condition leading to reduced melanin production; results in very light skin, hair, and eyes.
    • Melanocytes may be present but are defective, leading to inefficient melanin synthesis.
    • Melanocytes originate from neural crest cells; mutations in genes such as TYR affect melanin production.

    Sensory Roles of the Integument

    • Exteroceptors respond to external stimuli.
    • Nerve fibers in the skin regulate blood flow and gland secretion.
    • Sensory neurons in the epidermis: Free nerve endings detect pain and temperature; Merkel cells sense light touch.
    • Sensory neurons in the dermis: Various receptors (Meissner, Ruffini, Krause, Pacinian) detect touch, pressure, and vibration.

    Metabolic, Reservoir, and Disposal Functions of the Integument

    • Metabolic: Synthesizes vitamin D from UV exposure and plays a role in lipid metabolism.
    • Reservoir: Dermis holds about 5% of the body's blood volume; subcutaneous layer stores fat for energy and insulation.
    • Disposal: Eliminates waste through sweat and aids in toxin removal.

    Development of the Integument

    • Epidermis Development: Arises from ectoderm; early formation of simple cuboidal cells develops into protective basal and periderm layers.
    • Dermis Development: Derived from mesoderm; formed by collagen and elastic tissues and vascular development.
    • Melanocyte Development: Neural crest cells migrate to differentiate into melanoblasts.
    • Vernix Caseosa: Waxy fetal skin coating protects against amniotic fluid and consists of sebum, dead skin cells, and hair.

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    Description

    This quiz covers the main functions of the integument, including protection, sensory function, thermoregulation, metabolic processes, and sexual signaling. Additionally, it explores the structure of the epidermis, dermis, and subcutaneous layers, focusing on the tissues involved, specialized cells, and specific layers that make up these regions.

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