Skin Homework
Layer B is composed primarily of __________.
areolar connective tissue
Pressure receptors, called lamellar (Pacinian) corpuscles, are located in this layer of the integument.
dermal reticular layer
Which structure is highlighted?
fibroblast nuclei
Which structure is highlighted?
hair follicle
What is the most common cell type in the epidermis?
keratinocytes
What type of tissue is highlighted?
stratified cuboidal epithelium
Which layer is highlighted?
stratum spinosum
Which of the following terms describes layer D?
subcutaneous
What percentage of the dermis is composed of the highlighted tissue type?
80%
Cell division would be most common among cells in which of the labeled layers?
D Cells migrate upwards through the epidermis after being generated by mitosis in the stratum basale.
Layers B and C collectively form the __________.
Dermis
Which layer is composed primarily of dense irregular connective tissue?
Dermis
Drag the labels onto the diagram to identify the main structural features in the epidermis of thin skin.
Left picture- top to bottom: stratum corneum, stratum granulosum, stratum spinosum, straum basale, dermin right picture: top left to right: keratinocytes (many purple balls) derndiritic cell (purple blob) melanocyte (gray blob) tactile (merkel) cell (blue blob)
The portion of a hair that projects from the scalp surface is known as the __________.
Shaft
The ________ is the structure responsible for goose bumps.
arrector pili
Which structure is highlighted?
arrector pili muscle
Which structure is highlighted?
basement membrane
Which structure is highlighted?
duct of sudoriferous gland
Which structure is highlighted?
eccrine duct
Identify the layer indicated in the figure above.
hypodermis
These cells produce a brown-to-black pigment that colors the skin and protects DNA from ultraviolet radiation damage. The cells are __________.
melanocytes
This layer of the dermis is responsible for fingerprints.
papillary layer
Which region of the skin is highlighted?
reticular layer of dermis
The ducts of __________ glands usually empty into a hair follicle but may also open directly on the skin surface.
sebaceous
These glands are found all over the skin except in the palms of the hands and soles of the feet. They produce an oily substance that lubricates skin and hair.
sebaceous glands
What is secreted by the highlighted structure?
sebum
Which type of tissue is the highlighted region composed of?
stratified squamous epithelium, keratinized
From deep to superficial, the layers of the epidermis of thin skin are _______
stratum basale, stratum spinosum, stratum granulosum, stratum corneum
The cells in this layer of epidermis are dead, and their flat, scale-like remnants are filled with keratin.
stratum corneum
The most superficial layer of the epidermis is the __________.
stratum corneum
This layer of the epidermis contains translucent cells filled with keratin fibrils. It is found only in thick skin.
stratum lucidum
Which structure is a type of sweat gland?
C
What is true about the blood supply to the skin?
Epidermis is avascular and dermis is richly vascularized
Which structure is highlighted?
Pacinian corpuscle (lamellar corpuscle
Nails originate from the epidermis.
true