name the layers of the epidermis and describe the characteristics of each.
4/5 LAYERS OF THE EPIDERMIS – all 5 layers are present in thick skin (palms, finger tips & soles
Stratum corneum (horny layer) – accounts for up to 3⁄4 of epidermal thickness (20 – 30 cell layers thick)
Stratum lucidum (clear layer) – very thin translucent band with flattened, dead keratinocytes with indistinct boundaries, not present in regions of thin skin
- Stratum granulosum (granular layer) – the cells contains an abundance of granules.
- – cells flatten, nuclei & organelles disintegrate due to inadequate nourishment.
Stratum spinosum* (spiny or prickly layer) – appear spiky and contain a weblike system of intermediate filaments made of prekeratin protein.
Stratum basale* (basal layer) – constantly undergo mitotic cell division. (single cell layer) also known for its alternate name -- stratum germinativum
*only layer to receive adequate nourishment is spinosum & basale layers.