Divisions of the abdominopelvic cavity • Figure 1.8
To describe the precise location of organs within the abdominopelvic cavity, anatomists use
a nine-region system
a.
, while health providers find it easier to use a quadrant system
b.
Clavicles
Midclavicular lines
I---------1
Right
— I
Left
Right
hypochondriac
region
LSft
.hypochondriac
region
V]
Right inguinal
region
Left inguinal
region
Right —
upper
quadrant
(RUQ)
Right —
lower
quadrant
(R LQ )
Left
upper
quadrant
(LUQ)
Left
lower
quadrant
(LLQ )
a.
Anterior view showing location of abdominopelvic regions
b. Anterior view showing location of abdominopelvic quadrants
To describe the location of many abdominal and pelvic
organs more precisely, scientists divide the abdominopel-
vic cavity into smaller compartments. Anatomical scien-
tists use a grid of two horizontal and vertical lines (like a
tic-tac-toe grid) to separate the cavity into nine abdomi-
nopelvic regions (
Figure 1.8 a
). Each region has a distinct
name: the
right hypochondriac
(hi-po-KON-dre-ak),
epigas-
tric
(ep-i-GAS-trik),
left hypochondriac, right lumbar, umbilical
(um-BIL-i-kul),
left lumbar, right inguinal (iliac)
(IL-e-ak),
hy-
pogastric
(hi-po-GAS-trik), and
left inguinal (iliac).
However,
because it is the patient who often describes the location
of abdominopelvic pain, health providers find it easier to
divide the abdominopelvic region into quadrants, using
horizontal and vertical lines through the belly button (na-
vel) (
Figu re 1 .8 b
).
Finally, modern imaging technologies, such as com-
puted tomography (CT), magnetic resonance imaging
(MRI), and ultrasound (see
What a Health Provider Sees),
can show virtual slices of the body.
CONCEPT CHECK
1.
What
are the common and anatomical names of
each region of the body?
2.
How
would you describe the location of a poi-
son ivy rash that spreads up your left leg from
your ankle toward your knee, using anatomical
terminology?
3.
Why
do health providers use a quadrant system
for describing the abdominopelvic cavity?
14 CHAPTER 1
Organization of the Human Body
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