Chambers Of The Heart

Question 1

Sulcus Terminalis

Answer 1

Slight groove that traverses the wall of the right atrium from the inferior edge of the superior vena cava inferiorly

Question 2

Crista Terminalis

Answer 2

Corresponding muscular ridge on the inner aspect of the sulcus terminalis
-this ridge separates the smooth from the rough walled portion of the right atrium

Question 3

Atrial (interartrial) Septum

Answer 3

• the limbus of fossa ovalis

- fossa ovalis

Question 4

Right atrioventricular (tricuspid) valve

Answer 4

Between the right atrium and right ventricle

Question 5

Trabeculae Carneae

Answer 5

Mesh-like raised muscle bundles lining the walls

Question 6

Conus Arteriosus

Answer 6

Smooth-walled entry into the pulmonary trunk

Question 7

Tricuspid Valve components

Answer 7

The cusps (anterior, septal, posterior)

The chordae tendineae

Papillary muscles: septal, anterior, posterior

Question 8

Chordae Tendineae

Answer 8

Coming from each papillary muscle attach to adjacent flaps of the atrioventricular valve. The septal papillary muscle is very small.

Question 9

Valve Prolapse

Answer 9

During contraction of the ventricles, the tricuspid and bicuspid valve close, forcing blood to exit through the pulmonary and aortic semilunar valves. Closing of the tricuspid and bicuspid valve is achieved by a combination of pressurized blood exerting force on the valve and the papillary muscles and their connections to the valve cusps, the chordae tendineae, resisting that pressure to keep the valves closed.

Pathology can cause a disruption of this relationship. For example, elongation or rupture of the chordae tendineae can lead to displacement of a valve back into the associated atrium and leakage of blood. This phenomenon of valve insufficiency, which can be caused by a variety of reasons, is referred to as valve prolapse

Question 10

Septomarginal Trabecula

Answer 10

Moderator band

-it extends from the septum to the base of the anterior papillary muscle

Question 11

Pectinate Muscles

Answer 11

Restricted in distribution to the left auricle

Question 12

Bicuspid (Mitral) Valve

Answer 12

• Has anterior and posterior papillary muscles
• has chordae tendineae
• anterior and Posterior cusps

Question 13

Muscular part of the ventricular septum

Answer 13

-thick part of the ventricular septum

Question 14

Membranous part of the ventricular septum

Answer 14

Toward the semilunar valves, much thinner in this area

Question 15

Aortic Semilunar Valve

Answer 15

-3 cusps: right, left and posterior (no Coronary) for the aortic semilunar valve
Lunule: thinner superior rim of the valve cusps
Nodule: central elevation at the midpoint along the lunule
Aortic Sinuses (specific to this valve): contains the openings of the right and left coronaries

Question 16

Pulmonary Semilunar Vavle

Answer 16

3 cusps: right, left and anterior

has a lunule (thinner superior rim of the valve cusps)

The nodule: central elevation at the midpoint along the lunule