Broyles_The Integumentary System_2e_ch2.pdf

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bro78143_02_33-48.QXD
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CHAPTER 2
The Integumentary System
CHAPTER
2
The Integumentary System
Overview: The Integumentary System
Your skin (or integument) is your body’s largest
organ, weighing in at around 15 percent of your
body weight. The
Integumentary System
consists not only of your skin, but also your hair,
nails, sweat, and sebaceous glands—the so-called
accessory organs. In our exploration of the
Integumentary System,
we will focus our
attention on the nails and the layers of the skin in
the dissection views and the detailed structure of
the skin and its accessory organs in the histology
views.
HEADS
UP!
There are only three sections available for the
Integumentary System:
DISSECTION,
HISTOLOGY,
and
SELF-TEST.
There are no
ANIMATION
or
IMAGE
sections for this
system.
•
From the
Home screen,
click
the drop-down box on the
Select
system
menu.
•
From the systems listed, click on
Integumentary
and you will
see the following image:
•
This is the opening screen for the
Integumentary System.
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CHAPTER 2
The Integumentary System
EXERCISE 2.1:
Finger Nail: Sagittal View
•
From the opening screen for the
Integumentary System,
click the
DISSECTION
button
on the menu at the top of the
screen, and you will see the image
to the right:
•
Click on the
Select topic
menu
to view the choices available:
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CHAPTER 2
The Integumentary System
•
Choose
Finger nail
from the
menu, and you will see the image
to the right:
HEADS
UP!
The
View
menu displays
Sagittal.
This indicates that this is the only view
available for the fingernail. Otherwise, as you will recall from Chapter 1, the
Select view
menu would have a drop-down box with different views to
choose from.
•
Click the
GO
button, and you
will see the image to the right:
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CHAPTER 2
The Integumentary System
•
Click on
LAYER 1
in the
LAYER CONTROLS
window, and you will see the following image:
•
Click on
LAYER 2
in the
LAYER CONTROLS
window, and you will see the following image:
A
C
B
F
E
G
D
A B
C
L
H
I
K
M
N
J
•
Mouse-over the green pins on the screen to find the
information necessary to fill in the following
blanks.
A. _____________________________________________
B . _____________________________________________
C. _____________________________________________
•
Mouse-over the green pins on the screen to find the
information necessary to fill in the following
blanks:
A. ____________________________________________
B. ____________________________________________
C. ____________________________________________
D. ____________________________________________
CHECK
Finger Nail
POINT:
E. ____________________________________________
F. ____________________________________________
G. ____________________________________________
H. ____________________________________________
HEADS
UP!
•
left-click the pins on the screen to find the
information necessary to answer the following
questions:
1. Name the structures that are scalelike
modifications of epidermis.
2. What are the two functions of these
structures?
3. What is the name for the distal edge of
these structures?
Some of the structures in the dissections are not
part of the integumentary system, but are
important structures in the vicinity. These
nonintegumentary structures are tagged with blue
pins to distinguish them from the green pins of
the integumentary system.
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CHAPTER 2
The Integumentary System
Nonintegumentary System Structures
(Blue Pins):
I. ____________________________________________
J. ____________________________________________
K. ____________________________________________
L. ____________________________________________
M. ____________________________________________
N. ____________________________________________
CHECK
POINT:
Finger Nail, cont’d
4. Name the structure that consists of the
stratum corneum of the proximal nail
fold.
5. What is another name for this structure?
6. What structure does this structure overlie?
I N
R E V I E W
6. What is the name for the epidermal fold along the
lateral edge of the nail plate?
What Have I Learned?
The following questions cover the material that you just
learned—the
Integumentary System.
Use the information
in the
STRUCTURE INFORMATION
window for these
structures to answer the following questions:
1. Name the structures that are scale-like modifica-
tions of the epidermis.
7. Name the structure that consists of the stratum
corneum of the proximal nail fold.
8. What is another name for this structure?
2. What are the two functions of these structures?
9. What structure does this structure overlie?
3. What is the name for the distal edge of these struc-
tures?
10. What is the name for the proximal part of the nail
plate?
4. Name the part of the nail plate that consists of lay-
ers of compacted, highly keratinized epithelial
cells.
11. What is its function?
5. What layer of the epidermis does this structure
correspond to?
12. Name the growth zone of the nail that contains
mitotic cells.
Continued
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