Question

Stratum spinosum and stratum basale are together called.
A) Stratum lucidum
B) Stratum granulosum
C) Stratum corneum
D) Stratum Malpighii

Answer 1

Hint: Stratum basale is the deepest layer while stratum spinosum present just above it. They can also be called as the part of the malpighian layer. Stratum corneum is the uppermost layer. Stratum lucidum is present in thicker skin. Stratum granulosum located stratum spinosum.

Complete answer:
Epidermis consists of five layers, that are Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum and stratum corneum. The deepest layer of epidermis is known as Stratum Basale. It is also known as stratum germinativum, the deepest layer. It is separated from the dermis by the basement membrane and attached to the basement membrane by hemidesmosomes. It has cuboidal and columnar shaped cells. It contains melanocytes.
Stratum spinosum is also known as prickle cell. Polyhedral cells are present in the cell layer which is also called spines. The spine extends outward and contacts neighboring cells as desmosomes. This layer also contains dendritic cells.
Malphigian layer of the skin is mainly defined by the stratum basale and stratum spinosum as a single unit. It can be defined as stratum basale and stratum spinosum specifically. Its name was termed by the name of Marcello Malpighi. From the basal layer of the rete Malpighi basal cell carcinoma originates.
From the above information we have found that stratum spinosum and stratum basale are together called as stratum malpighii.

So, the correct answer is option D.

Note: The Malphigian layer is the important layer as it consists of two epidermis layers. It plays a vital role in the body. It protects the body against pathogens and excessive water loss. It also helps to regulate temperature, provide insulation and sensation. Human skin is mainly made up of two layers: the epidermis and the dermis.