Innervation Of The Heart Wall

Question 1

What nerve fibres does the vagus nerve carry?

Answer 1

Autonomic motor fibres (parasympathetic)

Question 2

Where do the sympathetic nerves which supply the heart and coronary arteries arise from?

Answer 2

Spinal cord segments T1-4 via the cardiac plexus

Question 3

Where is the cardiac plexus situated?

Answer 3

Bifurcation of the trachea

Question 4

Where do autonomic nerve fibres which supply the heart arise from?

Answer 4

Sympathetic from spinal cord segment T1-4

Parasympathetic from the vagus nerves

Question 5

Where is the sinoatrial node located?

Answer 5

Lies near the opening of the SVC in the right atrium

Question 6

Where is the atrioventricular node located?

Answer 6

Lies in the inferior part of the interatrial septum

Question 7

Arterioles stem from what type of arteries?

Answer 7

Muscular

Question 8

From which nerve plexus does the heart receive innervation from and where is this situated?

Answer 8

The cardiac plexus situated at the bifurcation of trachea

Question 9

Which structures unite to form the superior vena cava?

Answer 9

The right and left brachiocephalic veins