Download Equine I - Internal Organs

INTERNAL ORGANS
EQ. 5.00 – Standard: Understand equine anatomy
Objective 5.03: Understand the internal organs of equine.
ORGANS OF THORACIC CAVITY
• Area between the neck and abdomen
• Ribs form the sides of the thoracic cavity.
• The organs of the thoracic cavity include the circulatory
and respiratory systems.
• Major organs include:
• Heart: lies towards the bottom of the thoracic cavity and
to the left of the center.
• Lungs: lie to the sides and behind the heart and fill most
of the thoracic cavity
THORACIC CAVITY
• Functions of organs in thoracic cavity:
• The heart pumps blood throughout the horse’s
body.
• The lungs exchange oxygen and carbon dioxide
between the blood and the air.
LOCATION OF THORACIC CAVITY
ABDOMINAL CAVITY
• Extends from just behind the thoracic cavity to the
pelvic region
• Diaphragm - A body partition of muscle and
connective tissue; separates the abdominal and
thoracic cavities.
MAJOR ORGANS IN A.C.
• Liver – Large organ
extending all the way across
the abdominal cavity
• Spleen and Stomach – Lie
behind the liver and in front
of the small and large
intestine
• Kidneys – Lie on each side
of the backbone and under
the ribs in the loin area of
the horse
FUNCTIONS OF A.C.
• Liver metabolizes several nutrients, detoxifies (removes the
poison) many drugs and poisons and stores some nutrients.
• The spleen and stomach are part of the gastrointestinal
tract and function in the digestion and utilization of food.
• The kidneys remove wastes from the boy and conserve
fluids and important components of the blood.
ORGANS OF PELVIC CAVITY
• Continuous with the abdominal cavity
• Rectum – The terminal portion of the intestine,
which continues from the abdominal cavity to the
pelvic cavity
• Urinary Bladder – Lies within the pelvic cavity and
extends into the abdominal cavity when full
ORGANS OF PELVIC CAVITY
• Major organs include:
• Male reproductive organs which lie toward the
back and at the base of the pelvic cavity; OR,
• Female reproductive organs extending from the
back of the cavity to near the abdominal cavity.
PELVIC CAVITY
FUNCTIONS OF P.C.
• The rectum is the terminal portion of the intestine
and serves as the exit part for solid waste.
• The urinary bladder collects liquid waste.
• Horse reproductive organs will be covered.