Skin Homework
Pressure receptors, called lamellar (Pacinian) corpuscles, are located in this layer of the integument.
dermal reticular layer
Layers B and C collectively form the __________.
dermis (Although layers B and C can be distinguished based on their structural components, they form a continuous layer of the skin termed the dermis.)
Which structure is highlighted?
fibroblast nuclei
Which structure is highlighted?
hair follicle
What is the most common cell type in the epidermis?
keratinocytes
The portion of a hair that projects from the scalp surface is known as the __________.
shaft
his layer of the epidermis contains translucent cells filled with keratin fibrils. It is found only in thick skin.
stratum lucidum
Which layer is highlighted?
stratum spinous
What percentage of the dermis is composed of the highlighted tissue type?
80%
Nails originate from the epidermis
True
Which layer is composed primarily of dense irregular connective tissue?
C (Layer C consists primarily of dense, interwoven fibers of collagen designed to resist tearing from any direction.)
Which structure is a type of sweat gland?
C (Structure C is an eccrine gland, the most abundant type of sweat (sudoriferous) gland.)
Cell division would be most common among cells in which of the labeled layers?
D
What is true about the blood supply to the skin?
Epidermis is avascular and dermis is richly vascularized.
Drag the labels onto the diagram to identify the main structural features in the epidermis of thin skin.
Melanocyte at bottom
Which structure is highlighted?
Pacinian corpuscle (lamellar corpuscle)
Which of the following terms describes layer D?
Subcutaneous
Layer B is composed primarily of __________.
areolar connective tissue (The loose connective tissue within the papillary layer of the dermis is rich in blood vessels and cells that function in the body's defenses.)
The ________ is the structure responsible for goose bumps.
arrestor pili
Which structure is highlighted?
arrestor 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
What type of tissue is highlighted?
stratified cuboidal epithelium
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