Canine Anatomy Exam 2: Heart And Thorax

Front 1

Pericardium

Back 1

The thin but strong fibroserous covering of the heart

Front 2

Three Layers of the Pericardium

Back 2

The three components are inseparable. 1) Inner parietal serous pericardium 2) Middle fibrous pericardium 3) Outer pericardial mediastinal pluera

Front 3

Phrenicoparicardial Ligament

Back 3

The continuation of the fibrous pericardium to the sternum and diaphragm

Front 4

Serous Pericardium

Back 4

A closed sac that envelops most of the heart

Front 5

Parietal Layer

Back 5

Adheres to the fibrous pericardium and is continuous with the visceral layer (epicardium)

Front 6

Epicardium (Visceral Layer)

Back 6

The innermost layer of tissue adhering tightly to the heart

Front 7

Auricular Surface

Back 7

The surface of the heart facing the left thoracic wall (because the tips of the two auricles project on this side)

Front 8

Atrial Surface

Back 8

The surface facing the right thoracic wall (the right ventricle winds across the cranial surface from the atrial surface)

Front 9

Auricles

Back 9

Small appendages of each atrium

Front 10

Coronary Groove

Back 10

Groove that lies between the atria and ventricles and contains coronary vessels and fat

Front 11

Paraconal Interventricular Groove

Back 11

A groove obliquely transversing the auricular surface of the heart. It is longer and more distinct than the subsinuosal. It begins at the base of the pulmonary trunk (where it is covered by the left auricle). It contains the paraconal interventricular branch of the left coronary a.

Front 12

Subsinuosal Interventricular Branch

Back 12

The terminal part of the left Coronary a.

Front 13

Right Atrium

Back 13

Recieves blood from the systemic veins and most of the blood from the heart itself. It lies dorsocranial to the right ventrical and is divided into the sinus venarum (main part) and the right auricle (the cranial part).

Front 14

The Four Openings Into the Sinus Venarum of the Right Atrium

Back 14

1) Caudal Vena Cava 2) Coronary Sinus 3) Cranial Vena Cava 4) Right Atrioventricular Orifice

Front 15

Subsinuosal Interventricular Groove

Back 15

A groove ventral to the coronary sinus on the atrial surface of the heart

Front 16

Interatrial Septum

Back 16

The dorsomedial wall of the sinus venarum

Front 17

Intervenous Tubercle

Back 17

A transverse ridge of tissue between the two caval openings of the interatrial septum. It diverts the inflowing blood from the two caval veins toward the right atrioventriicular orifice

Front 18

Fossa Ovalis

Back 18

A slit-like depression that lies caudal to the intervenous tubercle and is the remnant opening of the foramen ovale

Front 19

Foramen Ovale

Back 19

In the fetus, an opening which allows blood to pass from the right to the left atrium

Front 20

Right Auricle

Back 20

The ear-shaped pouch of the right atrium that faces cranially and to the left. The internal surface is strengthened by pectinate muscles.

Front 21

Pectinate Muscles

Back 21

Interlacing muscular bands which strengthen the interior wall of the right auricle. They radiate to the auricle from the crista terminalis. They are also located on the lateral wall of the atrium proper.

Front 22

Endocardium

Back 22

A thin membrane lining the internal surface of the heart which is continued in the blood vessels as the endothelium-lined tunica intima.

Front 23

Crista Terminalis

Back 23

A smooth-surfaced, thick portion of heart muscle shaped like a semi-lunar crest at the entrance to the auricle. Pectinate muscles radiate from this crest to the auricle.

Front 24

Atrioventricular Orifice

Back 24

An opening that allows communication between the right atrium and ventricle. It contains the atrioventricular valve.

Front 25

Atrioventricular Valve

Back 25

A valve located between the right atrium and ventricle. It has two main parts, the parietal and septal cusps.

Front 26

Parietal Cusp of the Atrioventricular Valve

Back 26

A flap from the septal margin that is nearly as wide as it is long.

Front 27

Septal Cusp of the Atrioventricular Valve

Back 27

A wide but short flap that arises from the parietal margin of the orifice.

Front 28

What is the blood supply to the ventral abdominal wall of the pelvic cavity?

Back 28

Branches of the superficial epigastric arteries (the origin of the cranial epigastric artery is from the cranial epigastric).