Heart

Question 1

What are the two structures of the right auricle?

Answer 1

Crista terminalis: boundary between the auricle and sinus

Pectinate muscles

Question 2

What is the opening between the right and left atrium that allows blood to bypass the pulmonary circulation to the non-functional lungs of the fetus?

What is it called after birth?

Answer 2

Foramen ovale

Fossa ovalis

Question 3

What is the opening between the atrium and the ventricle?

Answer 3

Atritoventricular orifice

Question 4

What vein empties into the right atrium or cranial vena cava?

Answer 4

Right azygous vein

Question 5

What are the tendinous chords that extend from the cusps of the AV valve to the papillary muscles?

Answer 5

Chordae tendinea

Question 6

Trabeculae septomarginalis

Answer 6

Component of the conduction system of the heart extending from the interventricular septal wall to the parietal wall

Question 7

Trabeculae carneae

Answer 7

Trabeculations of the inner ventricular wall

Question 8

Conus arteriosus

Answer 8

Cone shaped portion of the right ventricle extending towards the pulmonary trunk

Question 9

What is the name of the valve in between the ventricle and the pulmonary trunk?

Answer 9

Pulmonary semilunar valve

Question 10

How many cusps are associated with the atrioventricular valves?

Answer 10

2

Question 11

What is the name of the valve between the left ventricle and the aorta?

Answer 11

Aortic semilunar valve

Question 12

What is the thin muscular partition between the right and left atria?

Answer 12

Interatrial septum

Question 13

What is the purpose of the intervenous tubercle?

Answer 13

Diverts the blood from the caudal and cranial vena cava into the right atrium

Question 14

What is the muscular partition between the right and left ventricles?

Answer 14

Interventricular septum

Question 15

What are the two main surfaces of the heart?

Answer 15

Auricular surface: left side positioned in the animal, both auricles in view

Atrial surface: right side in the animal, right atrium is the prominent structure in this view

Question 16

Coronary groove

Answer 16

Encircles the base of the heart and located between the atria and ventricles

Question 17

Where is the paraconal interventricular groove and what is found inside?

Answer 17

Adjacent to the conus arteriosus of the right ventricle

Paraconal interventricular branch of the left coronary artery and great cardiac vein are in this groove

Question 18

Where is the subsinuosal interventricular groove and what is inside here?

Answer 18

Located on the caudodorsal surface of the heart

Left coronary artery inside on the dog and ox
Right coronary artery is inside as well as the left with the horse and pig

Question 19

What is the ductus arteriosus?

Answer 19

Fetal structure that serves to shunt the blood from the pulmonary trunk to the aorta

Question 20

What is the ligamentum arteriosum?

Answer 20

Fibrous remnant of the ductus arteriosus in the adult

Question 21

What happens if the ligamentum arteriosum has a vascular ring anomaly?

Answer 21

Constrict the esophagus which could cause megaesophagus

Persistent right aortic arch

Question 22

What is the nutritional blood supply to the heart?

Answer 22

Coronary arteries