3. Cone shaped, muscular organ.
Weight = 250 – 350 gm.
Located in the middle mediastinum
Four chambers: two atria, two ventricles
Both ventricles – double pump
Responsible for blood circulation
THE HEART
11. MYOCARDIUM:
Middle layer of the heart.
Thickness:
Atria = 2 – 3 mm.
Right ventricle = 4 – 6 mm.
Left ventricle = 11 – 14 mm.
Insertion: Fibrous skeleton of the heart
13. Myocardium :
In atria: Pectinate muscles
In ventricles: Papillary muscles
3 Papillary muscles in the RV (attaches to the
tricuspid valve cusps).
2 Papillary muscles in the LV ( attaches to the
bicuspid value cusps.
(From inside)