Flashcards in Thorax (Test III) Deck (124)
What makes up the thoracic cage?
Ribs and costal cartilages, sternum, thoracic vertebrae, and the diaphragm (as the floor).
What are the three compartments of the thoracic cavity?
The mediastinum and left and right pulmonary cavities.
What is the vertebrae levels of the sternum?
What is the level of the sternal angle (the angle of Lewis)?
What is the level of the xiphoid process?
How many true ribs are there?
What are the false ribs?
What are the floating ribs?
What is the thoracic inlet bounded by?
(Anteriorly) superior border of the manubrium
(Laterally) 1st ribs and their cartilages
(Posteriorly) T1 vertebrae
What is the thoracic outlet bounded by?
(Anteriorly) costal cartilages of ribs #7-10 and the xiphsternal joint
(Posterior-Laterally) 11th and 12th ribs
(Posteriorly) T12 vertebrae
What travels into the thoracic inlet?
What travels through the thoracic outlet?
Inferior vena cava
What level is the jugular notch at?
What are the levels of the scapula (include those for the superior angle, base of the spine and the inferior angle?
Superior angle= T2-T3 and the 2nd posterior intercostal space
Base of spine= T4-T5 and the 4th posterior intercostal space
Inferior angle= T7-T8 and the 7th posterior intercostal space
Name the structures of a rib running posterior to anterior.
Head (with two articular facets for demi facets of vertebrae)
Tubercle (with articular facets for transverse processes of vertebrae)
Angle (where rib changes direction)
What is the subcostal groove?
A groove running on the inferior aspect of a rib. It is for the subcostal vein, artery, and nerve to run.
How are ribs orientated? What does this allow for?
Inferiorly to superiorly. This allows for the pump-handle movement during deep respiration.
Does the external intercostal muscle end anteriorly or posteriorly as the external intercostal membrane?
How does the internal intercostal muscle end?
Posteriorly as the internal and innermost intercostal membrane.
What artery runs on both sides of the sternum?
Internal thoracic (mammillary) artery.
What does the internal thoracic (mammillary) artery give off?
The anterior intercostal artery for spaces #1-6 and the pericardioacophrenic artery.
What does the pericardioacophrenic artery run with?
The phrenic nerve.
When does the internal thoracic (mammillary) artery divide? What does it divide into?
At the 6th intercostal space;
Superior epigastric artery and musculophrenic artery.
What does the superior epigastric artery (medial portion) supply?
Where do the anterior intercostal arteries for spaces #7-10 come off?
The musculophrenic artery (what the internal thoracic artery divides into at the level of the 6th intercostal space).
Where do the intercostal neves arise from?
The ventral primary rami of the thoracic levels.
Where do the posterior intercostal arteries of spaces 3-11 come from?
Off the descending aorta.
Where do the posterior intercostal arteries of spaces 1-2 come from?
Off the supreme intercostal artery (comes from the costocervical trunk)
What comes off the sympathetic trunk?
Gray and white communicans.