Heart

Question 1

Right atrium

Answer 1

receives blood from the systemic veins/blood from the heart; divided into sinus venarum/right auricle

Question 2

Sinus venarum

Answer 2

main part of the right atrium

Question 3

Right Auricle

Answer 3

blind cranial part of the right atrium; ear-shaped pouch, faces cranially and to the left

Question 4

Opening for the coronary sinus

Answer 4

ventral to the caudal vena cava, enlarged venous return for most of the blood from the heart

Question 5

Right A-V valve (tricuspid valve but only 2 cusps)

Answer 5

A-V orifice contains the valve from the right atrium to right ventricle, passive blood flow from atrium to ventricle, closes when heart contracts to prevent backflow

Question 6

Parietal cusp (A-V valve)

Answer 6

arises from the parietal margin of the A-V orifice

Question 7

Septal cusp (A-V valve)

Answer 7

flap from the septal margin, nearly as wide as it is long

Question 8

Interatrial septum

Answer 8

dorsomedial wall of the sinus venarum

Question 9

Intervenous tubercle

Answer 9

between the two vena cava openings, diverts the inflowing blood from the 2 caval veins toward the right atrioventricular orifice

Question 10

Fossa ovalis

Answer 10

caudal to the intervenous tubercle, slitlike depression; in embryo allows blood to pass between the right and left atrium

Question 11

Pectinate muscles

Answer 11

in right auricle; interlacing muscular bands; also found on the lateral wall of the atrium proper

Question 12

Endocardium

Answer 12

lines the internal surface of the heart; thin, glistening membrane

Question 13

Crista terminalis

Answer 13

smooth-surfaced, thick portion of heart muscle shaped like a semilunar crest at the entrance into the auricle

Question 14

Auricular surface

Answer 14

faces the left thoracic wall (L and R auricles visible)

Question 15

Atrial surface

Answer 15

faces the right thoracic wall (L and R atrium visible)