Cow Heart Dissection
Brachiocephalic Artery
Pulmonary Trunk
Right Ventricle
Left Atrium
Aortic Arch
Interventricular
Groove
Left Ventricle
**Anterior view—
notice all arteries
are in the front
• Same anterior view
with aortic arch
moved to the
proper side.
• See if you can
identify the aortic
arch,
brachiocephalic
artery, pulmonary
trunk, left and
right ventricles,
interventricular
groove, and the
left atrium.
• Probe going into
Brachiocephalic
Artery branching off
aortic arch
• Where is the blood
coming from when
it goes into the
aorta?
• Probe going into
Brachiocephalic
Artery branching off
aortic arch
• Where is the blood
coming from when
it goes into the
aorta?
– Left ventricle
through pulmonary
semilunar valve
• Probe identifying
pulmonary trunk
that will branch into
pulmonary arteries.
• Where is blood
entering the
pulmonary trunk
coming from?
• Where is it going?
• Pronbe identifying
pulmonary trunk that
will branch into
pulmonary arteries.
• Where is blood entering
the pulmonary trunk
coming from?
– Right ventricle coming
through aortic
semilunar valve
• Where is it going?
– Lungs!!
Superior/Inferior Vena Cava
Right atrium
Pulmonary veins
coming in to left
atrium—cut through
Right Ventricle
Left Ventricle
**Posterior view—
notice veins all
come in in back
• Another view of the
superior and
inferior vena cava
• Another view of the
vena cava leading
to the right atrium
**Interior of Right
Ventricle
Pulmonary trunk
White sheet of
endocardium
Right A-V valve,
or TRICUSPID
valve—can just
slightly see
chordae tendinae
Moderator band
Probe under chordae
tendinae of tricuspid
valve
Moderator Band
Probe through
myocardium of Right
Ventricle
Left atrium—cut through
Bicuspid, left A-V, or mitral
valve—cut through but can
see cusps (flaps)
Chordae Tendinae
Coronary vessel
**Interior of Left
Ventricle
Left Atrium
One cusp of biscuspid
valve
Chordae tendinae
attached to flap to
keep it from going
backward into
atrium
Papillary muscles
anchoring chordae
tendinae
Probe going through
aortic semilunar valve
Where will the probe go?
Where does blood go
after the left ventricle?
Probe going through
aortic semilunar valve
Where will the probe go?
Where does blood go
after the left ventricle?
•To the aorta then to the
body!!
Cusp of bicuspid valve
• Another picture of the
probe going through the
aortic semilunar valve.
– Notice that the
semilunar valve is
behind the cusp. It
leads to the aorta
which is medial to the
atrium. The aorta
comes out of the
middle of the base.
Myocardium
Wooden probe in
interventricular septum
Right ventricle
Left ventricle
• Compare myocardium of right and left ventricles—can
distinguish the two by this factor alone because one is
much thicker.
• Which is thicker? Why?
Right ventricle
Left ventricle
• Compare myocardium of right and left ventricles—can
distinguish the two by this factor alone because one is
much thicker.
• Which is thicker? Why?
– The left ventricle myocardium is much thicker because it must
pump blood to the whole body, not just the lungs.
Cusp of bicuspid valve
Chordae Tendinae
Papillary muscles
anchoring chordae
tendinae
The End
Good Luck Studying!
Be sure you know the cycle of
how blood flows!