Dissection 3.1 - Heart and Lungs

Internal (mammary) thoracic artery

Anterior intercostal artery originates from …

Intercostal space

Location of anterior intercostal artery

Anterior and posterior intercostal arteries

What arteries anastamose at the level of the costochondral junctions?

Brachiocephalic trunk, L CCA, L Subclavian

What are the branches of the aortic arch (R → L)?

Apex of the heart

Tip of the ventricle pointing inferolaterally

Left ventricle (aortic valve between)

What chamber of the heart does the ascending aorta arise from?

Arches over the root of the lung to join with the SVC outside the pericardial sac

Azygous vein general path

R subclavian and R CCA

What does the brachiocephalic trunk give rise to?

R/L internal jugular and subclavian veins

Convergence of what veins contribute to the brachiocephalic vein?

Superior vena cava

R and L brachiocephalic veins join to form …

Immediately posterior

Location of esophagus relative to trachea

Transverse thoracis muscles (adjacent to the lower and end of the sternum)

What is the innermost intercostal muscle?

Brain, face, neck

What regions does the internal jugular vein drain?

Course vertically adjacent to the sternum between the internal intercostal muscles and transverse thoracis muscle

Path of internal mammary/thoracic artery

Superior epigastric a. and musculophrenic a.

What are the terminal branches of the internal mammary/thoracic artery?

Pulmonary veins

Where does the left atrium receive blood from?

Ascending branch or aorta

Where does the left ventricle pump blood to?

Ligamentum arteriosum; 5

Adult remnant of the ductus arteriosus (shunt during fetal circulation) - Include number in diagram

Potential space between the parietal and visceral pleura

What is the pleural cavity?

C3, 4, 5 ventral rami

What nerves give rise to the phrenic nerve?

Descend vertically through mediastinum between mediastinal parietal pleura and pericardium and course just anterior to root of the lung

Path of phrenic nerve

Sensory and motor

What fiber components does the phrenic n. have?

Vagus n.

What nerve gives rise to the recurrent laryngeal n.?

Lower border of right subclavian a. and turns superiorly to ascend in the neck between the trachea and esophagus

Path of R recurrent layngeal n.

Coronary sinus, SVC, and IVC

What does the right atrium receive blood from?

Tricuspid valve

What valve is present between the right atrium and ventricle?

Inferior epigastric artery

What does the superior epigastric artery anastamose with?

Brachiocephalic trunk and L CCA

The trachea is located immediately posteriorly to which branches of the aortic arch?

Crosses R subclavian between the brachiocephalic trunk and R brachiocepalic v.

Path of R vagus nerve (CN X)

Ligamentum arteriosum/Aortic arch

What does the left recurrent laryngeal n. turn under?