Heart and Fundamentals of Cardiovascular System (Middle Mediastinum) Flashcards
What is anterior border of the middle mediastinum?
- anterior margin of pericardium
What is posterior border of the middle mediastinum?
- posterior border of pericardium
What is lateral border of the middle mediastinum?
- mediastinal pleura of the lungs
What is superior border of the middle mediastinum?
- sternal angle at vertebrae T4
- transverse thoracic plane
What is inferior border of the middle mediastinum?
- superior surface of diaphragm
Where is the base and apex of the heart?
- base = superior surface of heart
- apex = inferior (bottom left) surface of the heart
Where are the auricles of the atrium?
- antero-medial portion of the atrium
- ⬆️ contractile force of the atrium
What does auricle mean in greek?
- ear like flap
What does the inferior pericardium fuse with?
- central tendon of diaphragm
What does adventitia mean in relation to blood vessels?
- tunica adventitia (also known as externia)
- outer layer of blood vessels
What part of the heart is dominant on the right border of the heart?
- right atrium
What part of the heart is dominant on the inferior border of the heart?
- right and left ventricle
What part of the heart is dominant on the superior border of the heart?
- right and left atrium
- great vessels
What are the fossa ovalis in the atrium?
- remnants of foramen ovale (shunt betweem atria)
- on atrial septum, seperating atrium
- do not have function once baby is born
What is the coronary sinus in the heart?
- collection of veins from coronary blood flow
- delivers de-oxygenated blood from heart to right atrium
What are pectinate muscles?
- muscle fibres arranged like a comb
- assists with increasing volume of right atrium
What are pectinate muscles?
- muscle fibres arranged like a comb - assists with increasing volume of right atrium
Where does the inferior vena cava drain blood from?
- abdomen and rest of body
Where do the right and left pulmonary veins, bringing oxygenated blood, attach to the heart?
- left atrium - left and right are both pairs of veins - left and right inferior and superior
Where do the right and left pulmonary veins, bringing oxygenated blood, attach to the heart?
- left atrium - left and right are both pairs of veins (4 in total)
What is the Intratrial septum?
- wall separating atrium
Where are the papillary muscles?
- papillary = finger like
- in left and right ventricles
- base attaches to ventricle wall
- apices attach to chordae tendineae
What is the function of the papillary muscles?
- contract and pull on chordae tendineae - opens and closes valve - ensures valve leaflets do not prolapse
What is the function of the papillary muscles?
- contract and pull on chordae tendineae - opens and closes valve - ensures valve leaflets do not prolapse
What are the trabeculae carnae?
- roughened ridges of muscle
- similar appearance to trabecular bone
What is the moderator band in the ventricles?
- part of the trabeculae carnae - important in facilitating conduction into ventricles