Questions and Answers
¿De qué capa del embrión se origina la epidermis?
Ectodermo superficial
¿Qué células en la epidermis producen melanina?
Melanocitos
¿De qué células se origina la dermis?
Células mesenquimales
Study Notes
- The skin has a dual origin: the epidermis from the superficial ectoderm and the dermis from the underlying mesenchyme.
- The epidermis develops layers: basal/germinative, spinous, granular, and cornified.
- Melanocytes in the epidermis produce melanin, which gives pigmentation to the skin, hair, and nails.
- The dermis originates from three sources: mesoderm of the lateral plate, paraxial mesoderm, and neural crest cells.
- The dermis contains sensory nerve organs and papillary projections that extend into the epidermis.
- Hair develops from solid epithelial proliferations that penetrate into the dermis and form hair papillae.
- Sebaceous glands secrete sebum into hair follicles and onto the skin.
- Sweat glands are exocrine and form from yemas in the germinative layer of the epidermis.
- Mammary glands are modified sweat glands that develop from thickened epidermal bands and produce milk after puberty.
- Hormones stimulate branching of mammary ducts to form alveoli.
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