Dermal-Epidermal Junction and Stratum Corneum

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Questions and Answers

What type of cells primarily make up the stratum corneum?

Keratinocytes

Eosinophilic squamous cells (correct)

Melanocytes

Fibroblasts

Which characteristic describes the cytoplasm of the cells in the stratum corneum?

Filled with keratin (correct)

Filled with fluid

Contains nuclei

Rich in organelles

In which area of the body is the stratum corneum typically thicker?

On the eyelids

On the palm of the hand (correct)

On the forehead

On the scalp

What is a defining feature of the cells in the stratum corneum?

They have no nuclei Signup and view all the answers

What is the primary component of the cytoplasm in stratum corneum cells?

Keratin Signup and view all the answers

What is the relationship between the basal surface and unmyelinated nerve fibers?

The basal surface is in contact with the terminal of an unmyelinated nerve fiber. Signup and view all the answers

What structure is located between the epidermis and dermis?

A basement membrane. Signup and view all the answers

Which of the following statements about the dermal-epidermal junction is true?

It has a basement membrane present. Signup and view all the answers

How is the basal surface described in terms of its contact with nerve fibers?

It is in contact with the terminal of an unmyelinated nerve fiber. Signup and view all the answers

Which statement about the structure located between the epidermis and dermis is incorrect?

The basement membrane is always absent in healthy skin. Signup and view all the answers

What characteristic do the epidermal progenitor cells possess?

They are highly mitotic. Signup and view all the answers

Which of the following statements is true regarding the progenitor cells of the epidermis?

They can differentiate into all epidermal layers. Signup and view all the answers

What role do highly mitotic cells play in the epidermis?

They act as progenitors for all epidermal cells. Signup and view all the answers

In which layer of the skin do progenitor cells primarily reside?

Epidermis Signup and view all the answers

What distinguishes epidermal progenitor cells from other skin cells?

They undergo constant mitosis. Signup and view all the answers

What is formed by a melanocyte and its associated keratinocytes?

Epidermal-melanin unit Signup and view all the answers

What can be said about the density of epidermal-melanin units across individuals?

It is the same in all individuals. Signup and view all the answers

Which cell type is associated with the production of melanin?

Melanocyte Signup and view all the answers

What role do keratinocytes play in relation to melanocytes?

They associate with melanocytes to form units. Signup and view all the answers

Which of the following statements is not true regarding epidermal-melanin units?

Their density is different for different skin colors. Signup and view all the answers

What type of microscope is typically used for viewing larger specimens or living organisms?

Light microscope Signup and view all the answers

Which of the following characteristics is true for an electron microscope?

Can achieve higher magnifications than light microscopes Signup and view all the answers

What is a limitation of using a light microscope?

It cannot resolve details at the cellular level Signup and view all the answers

In which scenario would an electron microscope be preferred over a light microscope?

Studying the surface features of viruses Signup and view all the answers

How does the sample preparation differ between light and electron microscopes?

Electron microscopy often involves heavy metal staining Signup and view all the answers

Study Notes