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BODY CAVITIES:
What do we know?
What are Cavities?
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
DORSAL VS VENTRAL
What does each mean?
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Body Cavities

Dorsal cavity –Along the back- protects the
nervous system, and is divided into two
subdivisions



Cranial cavity – within the skull; encases the brain
Vertebral cavity – runs within the vertebral
column; encases the spinal cord
Ventral cavity- Along the belly- houses the
internal organs (viscera), and is divided into two
subdivisions

Thoracic- Heart and Lungs

Abdominopelvic-
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Body Cavities
Cranial cavity
(contains brain)
Thoracic
cavity
(contains
heart
and lungs)
Dorsal
body
cavity
Vertebral cavity
(contains spinal
cord)
Key:
Ventral
body cavity
Abdominal cavity
(thoracic
(contains digestive
and
viscera)
abdominoPelvic cavity
pelvic
(contains bladder,
cavities)
Diaphragm
Dorsal body cavity
Ventral body cavity
(a)
Lateral view
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
reproductive
organs,
and rectum)
Figure 1.9a
Body Cavities – thoracic cavity

Thoracic cavity is subdivided into two pleural
cavities, the mediastinum, and the pericardial
cavity



Pleural cavities – each houses a lung
Mediastinum – contains the pericardial cavity;
surrounds the remaining thoracic organs
Pericardial cavity – encloses the heart
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Body Cavities
Cranial
cavity
Vertebral
cavity
Thoracic
cavity
(contains
heart
and lungs)
Superior mediastinum
Pleural
cavity
Pericardial
cavity within
the
mediastinum
Abdominopelvic
Cavity
Key:
Dorsal body cavity
Ventral body cavity
(b) Anterior view
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 1.9b
Body Cavities – abdominopelvic cavity

The abdominopelvic cavity is separated from the
superior thoracic cavity by the dome-shaped
diaphragm

It is composed of two subdivisions


Abdominal cavity – contains the stomach,
intestines, spleen, liver, and other organs
Pelvic cavity – lies within the pelvis and contains
the bladder, reproductive organs, and rectum
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Body Cavities
Cranial
cavity
Vertebral
cavity
Diaphragm
Abdominal cavity
(contains digestive
viscera)
Key:
Dorsal body cavity
Ventral body cavity
Abdomino-pelvic
cavity
Pelvic cavity
(contains bladder,
reproductive organs,
and rectum)
(b) Anterior view
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 1.9b
Abdominopelvic Quadrants

Right upper

Left upper

Right lower

Left lower
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 1.12
What is in the UPPER QUADRANTS:
Left upper quadrant

the left portion of the liver, the larger portion of the
stomach, the pancreas, left kidney, spleen, portions
of the transverse and descending colon, and parts
of the small intestine.
Right upper quadrant


right portion of the liver, the gallbladder, right
kidney, a small portion of the stomach, portions of
the ascending and transverse colon, and parts of
small intestine.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
What is in the Lower Quadrants
Left lower quadrant

majority of the small intestine, some of the large
intestine, the left reproductive organs, and the left
ureter.
Right lower quadrant

The cecum, appendix, part of the small intestines,
the right reproductive organs, and the right ureter.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
TICKET OUT

USING SCRATCH PAPER:

Summarize what you learned today in your own
words. Identify main topics discussed.

What did you understand today and what is still
troubling you?
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
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