Which of the following layers is also known as the stratum germinativum?

Appeared in: NHM UP Staff Nurse-2023 Shift-2nd

Explanation

The stratum basale is the deepest layer of the epidermis, resting on the basement membrane.
It contains a single row of cuboidal or columnar stem cells that are mitotically active, meaning they continuously divide.
This process of cell division regenerates the keratinocytes for all superficial layers, earning it the name 'stratum germinativum' (germinating layer).

Option A: This is a thin, clear layer found only in thick skin, like the palms and soles. It consists of dead or dying cells and is not involved in cell generation.
Option B: This is the most superficial (outermost) layer, composed of multiple layers of dead, flattened, anucleated cells (corneocytes). Its function is protection, not cell production.
Option D: Located just above the stratum basale, this 'prickle cell layer' provides strength and flexibility to the skin due to its desmosomal connections. While some cell division can occur in its deepest part, the primary germinative layer is the stratum basale.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Layers of the epidermis and their nomenclature as background academic context rather than a clinical decision trigger.
Understanding the stratum germinativum is crucial for comprehending skin healing. Superficial wounds that only affect the epidermis can heal without scarring because the stratum basale regenerates the lost cells.
Basal cell carcinoma, the most common type of skin cancer, originates from the uncontrolled division of cells in the stratum basale.
What if? If a second-degree burn destroys the entire epidermis, including the stratum basale, the skin cannot regenerate on its own. Healing must occur from the edges of the wound or from skin appendages (hair follicles, sweat glands), and skin grafting is often required.

How to Approach the Question

First, identify the key term in the question: 'stratum germinativum'.
Break down the term: 'Germinativum' relates to 'germination' or 'generation', implying a layer where new cells are produced.
Recall the functions of the different epidermal layers. The deepest layer is responsible for mitosis (cell division).
Match the function of cell generation with the correct layer. The stratum basale is the primary site of mitosis in the epidermis.
Conclude that stratum basale is the layer also known as stratum germinativum.

Concept Tested & Keywords

QGrNn-PGmr2ZWvg03xjyTd

E6 Physiology Essentials Sembulingam 10e Part 2 p. 2-4

E6 Anatomy Applied Ashalatha 4e p. 229-231

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 4 p. 49-51

Practise the full NHM UP Staff Nurse-2023 Shift-2nd

Attempt every question from this paper in a timed mock, then review the full solution for each one.