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Flashcards in Lab 3: Heart Deck (43)
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Distinguish between superior and inferior.

S: toward the head or the upper part of a structure
I: away from the head or the lower part of the structure


What are two other names for superior?

Cephalic or cranial


What is another name for inferior?



What is meant by anterior and posterior?

A: nearer to or at the front of the body
P: nearer to or at the back of the body


What is ventral also known as in humans? What about 4 legged animals?

Humans: Anterior
4-legged: Inferior


What is meant by medial and lateral?

M: nearer tot he midline
L: farther from the midline


What is meant by intermediate?

Between two structures


What is meant by ipsilateral and contralateral?

I: on the same side of the body as another structure
C: on the opposite side of the body from another structure


What is meant by proximal and distal?

P: nearer to the attachment of a limb to the trunk , nearer to the origination of a structure.
D: Farther from the attachment of a limb to the trunk, farther from the origination of a structure.


What is meant by superficial and deep? What are two other terms for this?

External: Toward or on the surface of the body
Internal: Away from the surface of the body


How does the sheep heart differ from the human heart?

Size: sheep heart is smaller
Shape of the atria
In sheep, venous blood is drained from the head and forelegs to the heart via two anterior (large right and small left), whereas in humans, there is only one superior vena cava. The shape of the right atrium is influenced by the entry of these large vessels.


What are the similarities of the sheep heart and the human heart?

Internal features of the adult sheep heart and human sheep heart are very similar.


What do each of the following directional terms of humans correspond with in a sheep?
- Superior or Cranial
- Inferior or Caudal
- Anterior or Ventral
- Posterior and Dorsal

- Anterior or Cranial
- Posterior or Cranial
- Ventral
- Dorsal


What forms the apex of the heart?

The larger LV


What does the groove running diagonally across the ventricles represent?

The position of the septum separating RV and LV.
Marks the course of one of the coronary arteries and a cardiac vein.


Which vessel is most ventral?

The pulmonary trunk


What is the ligamentum arteriosum?

A fibrous bridge linking the pulmonary trunk to the aorta.


Which is the base of the heart?

The broad end of the heart.


What are the two parts of the atria? Describe the walls of each.

The main part has a smooth internal wall.
The second part, the atrial appendage (auricle), has an irregular internal surface on which bundles of muscle fibres cross each other in the same way that a basket is woven together (trabeculated).


What are the tendinous cords placed in tension by?

The papillary muscles on the inside wall of the ventricles


What traverses the right ventricle from wall to wall?

A slender bridge, the moderator band.


What is the moderator band made of? What is it's function?

Muscle. It has no mechanical function in the action of the heart, and contains modified cardiac muscle fibers (Purkinje fibres) which are part of the heart's conduction system.


Where are the openings of the coronary arteries located?

Just inside the aortic valve flaps.


Where do the cardiac veins drain into?

The right atrium


What is another name for the Fossa ovalis?

Foramen ovale


What is the purpose of the foramen ovale?

Allows blood to cross from the right atrium to the left in the sheep fetus.


What are the three indicators that we are looking at the sheep heart in a ventral view?

1) Great arteries visible
2) Auricles of atria seen (pointy ends)
3) Interventricular sulcus/groove is diagonal


What is the first external outlet of the aorta? Where does blood from this outlet go to?

Brachiocephalic aorta
Head and arms


What indicates a dorsal view?

A vertical sulcus


what are found just behind the valves of the aorta?

Coronary ostia - the openings to the coronary arteries