ACTIVITY 4 : PRACTICE ATLAS chapter 19 internal heart chambers anterior right atrium

Fossa ovalis

Location:

• Heart

• Right atrium

Description:

• Oval depression on interatrial septum

Comment:

• Remnant of fetal blood shunt (foramen ovale) from right atrium to left atrium

Interatrial septum

Location:

• Heart atria

Description:

• Partition separating right and left atria

Comment:

• Common site for congenital heart defect: atrial septal defect (ASD)

Opening of coronary sinus

Drainage:

• Receives venous blood from heart

Tributaries:

• Great, middle, and small cardiac veins

Course:

• Passes from left to right in posterior portion of coronary (atrioventricular) sulcus

Termination:

• Right atrium

Opening of inferior vena cava

Location:

• Right atrium

Description:

• Opening to receive venous blood from regions of body inferior to diaphragm

Opening of right atrioventricular valve

Location:

• Heart

• Right atrium

Description:

• Opening to the right atrioventricular valve

Opening of superior vena cava

Drainage:

• Head

• Upper limbs

• Posterior thoracic walls

• Mediastinal structures

Tributaries:

• Formed by union of right and left brachiocephalic veins

• Arch of azygos vein

Course:

• Descends in mediastinum from level of right 1st costal cartilage

Termination:

• Right atrium

Pectinate mm.

Location:

• Heart (atria)

Description:

• Ridges of myocardium extending from crista terminalis in right atrium

• Ridges also occur in right and left auricles