Download Exercise 20

Exercise 20
Gross Anatomy of the Heart
BI 232
The heart
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Two-sided, doublepumping organ.
The left side controls the
flow of blood to all tissues
and cells in the body,
where oxygen and
nutrients are delivered
and wastes are taken away.
The right side sends blood
to the lungs, where
oxygen stored in RBCs is
replenished and CO2 is
released
The Pericardium
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Membranous sac
2 parts: outer fibrous
pericardium that is
fused to adjacent
structures and an inner
serous pericardium
which is a delicate serous
membrane that forms a
double-layered sac around
the heart.
The serous pericardium
consists of parietal and
visceral layers.
Mediastinum

The heart and pericardial
cavity are located within
the mediastinum, a
centrally located area
within the thoracic cavity.
External Anatomy of the Heart
External Anatomy of the Heart
Internal Anatomy of the Heart
Coronary Circulation
Coronary Circulation
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On the posterior surface
of the heart, the coronary
artery branches to
become the posterior
interventricular artery
Near the apex of the
heart the anterior and
posterior interventricular
arteries form an
anastomosis
(connection)
Coronary Circulation
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On the posterior surface
of the heart, the
coronary sinus runs
along the coronary sulcus
and empties into the right
atrium.
Great cardiac vein
found in the anterior
interventricular sulcus
Middle cardiac vein
ascends along the
posterior interventricular
groove
Blood flow Through the Heart
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Pulmonary
Circulation- Blood from
the right side of the heart
flows to and from the
lungs
Systemic CirculationBlood from the left side of
the heart flows from and
to all body tissues.
Position of Heart
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Base of the heart
extends from the inferior
border of the second
costal cartilage on the left
side to the superior
border of the third costal
cartilage on the right.
Apex of the heart is
located in the left fifth
intercostal space, left of
the median plane
Today’s lab
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Dissect sheep heart
ID structures on the heart models