Unit One Intercostal Spaces Flashcards
Thoracic wall components of posterior aspect
Twelve thoracic vertebrae, intervertebral discs
Thoracic wall components of lateral aspect
Twelve ribs, three flat muscles (intercostal spaces), intercostal vein, artery and nerve
Thoracic wall components anterior aspect
Sternum
What are the muscles of the thoracic wall
External intercostal, internal intercostal, innermost intercostal, subcostales, transversus thoracis
Function of muscles of the thoracic wall
Help maintain space between ribs
External intercostal active during
Inspiration
Internal intercostal active during
Expiration
Innermost intercostal function
Help maintain space between ribs
Subcostales muscle is on the same plane as
Innermost intercostalis muscle
Subcostales muscle spans
Multiple ribs by skipping a rib
Function of subcostales muscle
Pull down on ribs
Subcostales muscle is located on
Posterior thoracic wall
Transversus thoracis muscle comes off of the
Sternum
Transversus thoracis muscle is on the same plane as
Innermost intercostals
Transversus thoracis muscle secures what
Internal thoracic vessels to the wall
actions of the intercostal muscles
Support intercostal spaces during breathing and pull ribs nearer to one another
What are the contents in the intercostal spaces
External intercostal, internal intercostal, innermost intercostal, subcostales, transversus thoracis and intercostal vein, artery, and nerve
What are the branches of the internal thoracic artery
Superior epigastric artery, musculophrenic artery, anterior intercostal arteries, pericardiophrenic artery, and mediastinal artery
The superior epigastric artery enters the
Rectus sheath
The superior epigastric artery supplies the
Rectus muscles to umbilicus
Musculophrenic artery supplies the
Diaphragm
the musculophrenic artery is the origin for what arteries
Lower anterior intercostal arteries
The anterior intercostal arteries connects with
Posterior intercostal arteries
The pericardiophrenic artery accompanies the
Phrenic nerve
The pericardiophrenic artery supplies what
Pericardium and diaphragm
The mediastinal artery supplies the
Anterior mediastinum (thymus)
The internal thoracic vein drains into the
Brachiocephalic vein
The intercostal arteries divide into
Anterior and posterior
What are the anterior intercostal arteries
Internal thoracic and musculophrenic artery
The internal thoracic artery is the origin for what ribs
1-6
The musculophrenic artery is the origin for what ribs
7 to 10
What are the posterior intercostal arteries
Subclavian artery and thoracic artery
What trunk comes off the subclavian artery for the posterior intercostal arteries
Costocervical trunk
The subclavian artery is the origin for
Superior two posterior intercostal arteries
The thoracic aorta is located where
Left side of vertebral column
The thoracic aorta is the origin for
Lower 9 posterior intercostal arteries
What comes off the costocervical trunk
First 2 intercostal arteries that run posteriorly
What are the anterior intercostal veins
Musculophrenic vein and internal thoracic vein
The anterior intercostal veins drain into
Brachiocephalic veins
Do the anterior intercostal veins drain into brachiocephalic vein on both sides, or right or left
Both sides
What are the posterior intercostal veins
Azygous, hemiazygous and left brachiocephalic vein
Azygous drains to what side and where
Right side and superior vena cava
The hemiazygous vein drains on what side and where
Left side and azygous vein
What is the upper posterior intercostal vein on the left side
Left superior intercostal vein
What is the middle posterior intercostal vein on the left side
Accessory hemiazygous vein
What is the lower posterior intercostal vein on the left side
Hemiazygous vein
