Basal layer of cell in stratified squamous epithelium is –
First, I need to recall the structure of stratified squamous epithelium. The basal layer is the deepest layer, right? It's where the cells are attached to the basement membrane. The cells here are cuboidal or columnar and actively dividing. They're called basal cells or germinativum cells. Wait, in some textbooks, the basal and germinativum layers are considered together, but in stratified squamous epithelium, the basal layer is the one closest to the basement membrane.
Now, the options aren't provided, but the correct answer is supposed to be the basal cells. Let's think about possible distractors. Common mistakes might confuse the spinous layer (prickle cells) or the granular layer. The spinous layer is above the basal layer, and the granular layer has cells filled with keratohyalin granules. The stratum basale in skin is part of the epidermis, which is stratified squamous.
For the core concept, the key point is the basal layer's role in cell proliferation. The cells here undergo mitosis to replenish the layers above. They're undifferentiated and give rise to the more differentiated layers.
Why is the correct answer right? Because the basal layer consists of basal cells that are mitotically active. They produce the spinous cells through differentiation. The basement membrane is just below them, anchoring the epithelium to underlying connective tissue.
Wrong options: If an option mentions spinous cells (prickle cells), that's incorrect because they're in the layer above. Granular cells are in the granular layer, which is superficial. Squamous cells are the topmost layer.
Clinical pearl: Remember that in the epidermis, the stratum basale (basal layer) is the only layer with mitotically active cells. This is crucial for wound healing and regeneration. Also, in pathological conditions like basal cell carcinoma, the origin is from these basal cells.
Need to check if the terms used are standard. Yes, "basal cells" are the correct term for the basal layer in stratified squamous epithelium. The germinativum layer is sometimes included with the basal layer in some classifications, but the question specifically asks for the basal layer.
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**Core Concept**
The basal layer (stratum basale) of stratified squamous epithelium consists of cuboidal to columnar **basal cells** that are mitotically active. These cells undergo proliferation to replenish the suprabasal layers, forming the foundation for epithelial renewal. This layer is directly attached to the basement membrane.
**Why the Correct Answer is Right**
The basal layer is composed of **basal cells** (also called germinative cells), which are the only mitotically active cells in stratified squamous epithelium. These cells differentiate into spinous cells (stratum spinosum) as they migrate upward. The basement membrane (lam