Musculoskeletal Wk 2 - Cytodifferentiation cells within a tissue become specialized Histogenesis various cell types come together to form tissues

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Cytodifferentiation: cells within a tissue become specialized. Histogenesis: various cell types come together to form tissues. Induction: Chemical messages that affect the behavior and development of cells and tissues
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Skin Development Epidermis is derived from surface ectoderm Dermis is derived from mesoderm Somatic lateral mesoderm (limbs of body) Dermatomes of the somites (axis of body)
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Periderm: Thin layer of flattened epidermal cells that allow exchange of water, sodium, and glucose between the amniotic fluid and epidermis
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Vernix Caseosa Covers fetal skin Protects skin from exposure to fluids Facilitates birth Almost like vasoline
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Third month epidermis Peridermal cells –outermost layer Intermediate cells Basal cells – innermost layer
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Sixth Month Epidermis Peridermal cells die Epidermis is now a barrier from the outside environment
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Immigrant Epidermal Cells Melanoblasts are derived from neural crest cells Langerhans Cells are derived from bone marrow Merkel Cells derived from epidermal precursors or neural crest cells???
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Dermis Somatic dermatomes (Dorsal Trunk) Neural crest cells (Head and Neck) Lateral mesoderm
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Glands Derived from the epidermis Sebaceous Buds off of follicular epidermis Sweat Eccrine Epidermal downgrowths Apocrine Downgrowth from stratum germinativum Begin to secrete during puberty
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Hair Derived from the stratum gerinativum Lanugo Fine hair that covers the entire body of the embryo Replaced perinatal period by coarser hair
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This note was uploaded on 11/21/2011 for the course ANAT 1502 taught by Professor Johnh.romfh during the Spring '10 term at Life Chiropractic College West.

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Musculoskeletal Wk 2 - Cytodifferentiation cells within a tissue become specialized Histogenesis various cell types come together to form tissues

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