Mediastinum

Question 1

Fossa ovalis

Answer 1

Remnant of the foramen ovale

-In RA, to the right of interatrial septum

Question 2

What are the muscles found in the Right atrium, right auricle, left auricle

Answer 2

Pectinate muscles

Question 3

What is the terminal crest?

Answer 3

Muscular ridge in right atria that separates it into two parts

Question 4

What are the two parts of the atria that are separated by the terminal crest

Answer 4

1. Venous sinus - has openings for cavas, coronary sinus

2. Atrium proper - rough, anterior wall with pectinate muscles

Question 5

Describe the Right Ventricle

Answer 5

• Separated into 2 parts by supraventricular crest
  
  • Right ventricle proper - inflow channel ant/post/septal papillary muscles, valve, chordae tendinae ,
  • Conus arteriousus - smooth outflow channel; blood is pumped into pulmonary trunk

Question 6

Describe the left ventricle

Answer 6

Two parts:

1. Left ventricle proper - inflow channel - ant/post papillary muscles, valve, chordae tendinae, receives blood from LA
2. Aortic vestibule - outflow channel - smooth - blood flows to aorta

Question 7

Which atria is smaller in size but thicker walled than the other

Answer 7

Left atrium