TOPIC 1B. The external surface of the heart, its base and its structure Flashcards
Where is the heart situated
between rib 3-6, mainly left side of thorax (60%)
where does the heart sit
in the mediastinum, separating left and right pleurae
where does the right auricle face
cranial and left
where does the left auricle face
caudal and left
facies auricularis
faces left thoracic wall
facies atrialis
faces right thoracic wall
margo ventricularis dextra
cranial margin, is convex
margo ventricularis sinistra
caudal margin, is concave
basis cordis
dorsal, cranial has hilus where great vessels attach
apex cordis
ventral and caudal, has incisura cordis from sulcus paraconalis
describe ru and eq heart
large,
axis nearly verticle
apex 2-3cm from sternum
what lig joins eq and ru heart to sternum
lig sternopericardiaca
2 in ru and sus
describe canine heart
small,
axis tilted
what lig is a continuation of pericardium fibrosum to the diaphragm
lig phrenicocardiaca
name the cardiac wall layers
epicardium, myocardium and endocardium
what is the pericardium
fibrous layer of the heart
name the layers of the pericardium
- fascia
- pleura
- pericardium fibrosum
- pericardium serosum with lamina parietalis, cavum pericardi (with liquer pericardii) and lamina visceralis
what marks the separation of the atria and ventricles
sulcus coronalias
what does sulcus coronalias contain
coronary vessels and fat
describe path of sulcus interventricularis paraconallis
starts at base of pulm trunk under left auricle, runs across facies auricularis to incisura apex cordis.
goes caudal to conus arteriosus of right ventricle
what does sulcus interventricularis paraconalis contain (2)
r interventricularis paraconalis of left coronary artery and v cordis magna
where is sulcus interventricularis subsinosus
caudodorsally on facies atrialis
starts below sinus venarum cavarum
what does sulcus interventriculosus subsinosus contain (2)
terminal branch of left coronary artery; r interventricularis subsinosis and v cordis media
what may appear in cartilage of ru
anuli fibrosi- orifices of bone (4) - surround av, aoritc and pulmonary openings