Anatomy Exam 3 Thorax Flashcards
Describe the intercostal neurovascular bundle?
Vein is Superior Artery is Middle Nerve is Inferior Think NAV, nerve is closest to the Navel
What structures are found in the Mediastinum
- Heart
- Great Vessels
- Trachea
- Esophagus
Number of lobes R and L lungs
L - 2
R - 3
Fissure of the left lung
Oblique and divides the upper and lower lobes
Fissures of the Right lung
Oblique divides the upper and lower. Horizontal divides the superior and middle
Right lung relations
- R brachiocephalic vein
- SVC
- Pericardium of RA
- Azygous Vein
- R vagus nerve
Left lung Relations
- Pericardium
- Aorta
- L phrenic nerve
Boarders of the heart
Inferior - costal and diaphragmatic
Anterior - Costal and mediastina
Posterior - rounded and non distinct
What is the costodiaphragmatic recess?
Potential space within the pleural cavity at the junction of the inferior boarder. During forced inspiration, lung fills the void. During expiration it is filled with fluid
Describe the SNS innervation of the bronchi
The pulmonary plexus resides posterior to the lung root. SNS fibers originate in the upper thoracic ganglia, they supply smooth muscle and pulmonary blood vessles
Describe the PNS innervation of the lungs
The pulmonary plexus resides posterior to the lung root. PNS fibers are derived from the Vagus nerve and supply bronchial smooth muscle and mucous glands
Boundaries of the mediastinum
Superior - Superior Thoracic Aperture
Inferior - Diaphragm
Anterior - Sternum
Posterior - Vertebral bodies
Mediastinal divisions
Superior
Inferior
Compartments of the Inferior mediastinum
- Middle (largest)
- Anterior
- Posterior
Contents of the Middle Mediastinum
Heart and fibrous pericardium
Contents of the Anterior Mediastinum
Fat and Thymus gland remnants
Contents of the Posterior mediastinum
- Esophagus
- Descending thoracic aorta
- Thoracic Duct
- SNS trunks
Contents of the superior mediastinum
- SVC and tributaries
- Aortic Arch and branches
- Trachea
- Esophagus
- Thorasic duct
- R and L Vagus and Phrenic nerves
Neurovasculature of the fibrous pericardium
- innervation by the phrenic nerves
- Supply by internal thoracic arteries
- Drainage pericardiophrenic veins
What are the 2 reflections formed by the continuation of the visceral and parietal serous pericardium
- Transverse pericardial sinus
2. Oblique pericardial sinus
What comprises the transverse pericardial sinus?
Two sleeves
- Surrounds the ascending aorta and pulmonary trunk
- Surrounds the SVC, IVC and pulmonary veins
Right border of the heart
- RA
- Between the 3rd and 6th intercostal and 3 CM right of midline
Left border of the heart
- LV and L Auricle
- Slopes upward/ medially
- L 5th ICS to L 2nd ICS
Inferior border of the Heart
- RA and RV
- R 6th ICS to L 5th ICS
Anterior (sternocostal)surface of the heart
- RA, RV, -small strip of the LV and L Auricle
Posterior (base) Surface of the heart
- LA, small portion of RA