child in supine position with central venous pressure catheter inserted into right atrium. Heart with catheter in place has been made visible.

Anterior view of the superior mediastinum ribs excised, heart, thymus, aortic arch and vena cava removed to reveal pulmonary arteries.

Cutaway of a vein to reveal internal anatomy and structure of wall.

Needle penetrating the muscle to gain access to the chest cavity.

Cross-section of a portion of the ribcage showing the intercostal artery and vein running parallel to the ribs within the intercostal muscles. Needle is penetrating the muscle to gain access to the chest cavity.

Image showing technique for assessing carotid pulse. Health care professional approaches from the head and, placing hands on both sides of the victim's head feels for the carotid pulse in the neck with index and middle fingers.

Cardiac veins.