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BIOL 1840U (44)
Lecture

Skin Histology

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School
Department
Biology
Course
BIOL 1840U
Professor
Peter Cheung
Semester
Fall

Description
Outline of Lecture 21 (05-07 A; Hubbard) Skin Histology Epidermis - Epidermal ridge: projects into dermis for epidermis-dermis attachment, prominent in thick skin - Four layers (superficial to deep) - Stratum corneum: cornified dead cells - Stratum granulosum: apoptotic cells and exocytosis of lamellar bodies - Stratum spinosum: nonproliferative, desmosomes keep cells attached to each other - Stratum basale: proliferating cells, hemidesmosomes attach to dermis - Melanocytes: cells with clear cytoplasm and prominent nuclei that transfer melanin to keratinocytes - Merkel cell: touch receptors - Langerhans’ cell: immune protection in spinous layer - No intrinsic blood supply to epidermis; nutrients diffuse from plexus III Dermis - Dermal papillae: projects into epidermis fo
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