Cardiovascular Anatomy COPY Flashcards
What are the three histological tissue layers of the heart?
- Epicardium
- Myocardium
- Endocardium
What are the three histological tissue layers of blood vessels?
- Tunica intima
- Tunica media
- Tunica adventitia
What components make up both the tunica intima and the endocardium?
Epithelium, basement membrane and connective tissue
What two types of tissue are present in the tunica media?
Smooth muscle and elastic tissues
What three types of arteries are there?
Elastic, muscular and arterioles
At what surface anatomy point does the mediation divide into its superior and inferior regions?
T4 (Sternal angle)
At what anatomical point does the apex of the heart occur?
Fifth left intercostal space
Where does the descending aorta lie?
Along the posterior body wall just infront and to the left of the bodies of the thoracic and lunar vertebrae
At what vertebral level does the beginning and termination of the aortic arch occur?
T4
At what vertebral level does the bifurcation of the abdominal aorta occur?
L4
At what vertebral level does the bifurcation of the common iliac arteries occur?
L5
What is the typical diameter of the aortic root and how can this vary during dilation?
3.5cm can distend to 4.5cm
Name the most proximal to the most distal structures arising from the aortic root
Brachiocephalic arteries, Left common carotid, left subclavian artery
Arteries are to branches as veins are to _______
Tributaries
What are the great arteries of the heart?
The aorta and the pulmonary trunk
What are the great veins of the heart?
Superior and inferior vena cava
What are the tributaries of the SVC?
Left and right brachiocephalic veins and azygos veins
What are the tributaries of the IVC?
Left and right common iliac veins
Describe the azygos venous system?
Drains blood from the posterior intercostal veins to the SVC
What two vessels make up the azygos venous system?
The azygos vein - right side of the posterior mediastinum
The hemiazygos vein - on the left side (drains into the azygos v. at approx. levels T8/T9
What anterior chest wall veins drain into the internal thoracic vein?
Superior epigastric vein
Why anterior chest wall arteries arise form the internal thoracic artery?
Musculophrenic and superior epigastric arteries
Which side of the chest drains its lymph into the thoracic duct?
The left
Lymphatics from the right upper quadrant of the body drain into where?
The right lymphatic duct
What artery gives rise to the internal thoracic artery?
The subclavian artery
Where is the thoracic duct located?
Located on the vertebral bodies between the azygos vein and descending aorta on the right side of the posterior thoracic wall
Where does the right lymphatic duct drain to?
Junction of right internal jugular and right subclavian veins
Where does the thoracic duct drain?
The junction of the left internal jugular and left subclavian veins
What and where is the cisterna chyli?
Most inferior part of the thoracic duct at L4
The subclavian artery becomes what artery at the lateral boarder of the first rib?
The axillary artery
At what anatomical point does the axillary artery become the brachial artery?
At the lower margin of the teres major muscle
Where does the brachial artery bifurcate and what does it branch into?
Inferior to the cubital fossa - bifurcation into the brachial and radial artery
What vein anatomises the basilic and cephalic veins?
The median cubital vein
What is the clinical importance of the median cubital vein?
Compressing the veins proximal to it, the MCV becomes easily visible and palpable - good for IV drip infusion
What are venae comitantes?
Accompanying veins to the deep arteries of the upper and lower limbs
What is the larger vessel of the internal and external iliac arteries?
The external
What does the external iliac artery branch into?
The deep and superficial femoral artery
Which artery gives rise to the popliteal artery?
Superficial femoral
What two arteries form from the popliteal artery?
The anterior and posterior tibial
What are the deep veins of the lower limb?
External iliac, femoral vein, popliteal vein, posterior and anterior tibial and fibular vein
What are the superficial veins of the lower limb?
Great and small saphenous veins
Between what two layers of the pericardium does the pericardial cavity lie?
Parietal and visceral
Which layer of the pericardium belongs simultaneously to both the heart wall and the serious pericardium?
Visceral
Which layer of the pericardium is inseparably attached to the inner aspect of the fibrous pericardium?
Parietal
What is the protective role of the fibrous pericardium?
Prevents over-filling of the heart
Visceral pericardium receives what kind of innervation?
Autonomic innervation from T1-T4 nerves via the cardiac plexus
What is the main nerve responsible for the innervation of the parietal and fibrous layers of the heart?
The phrenic nerve
Which layers of the pericardium is innervated by pain fibres?
Parietal and fibrous layers
What is cardiac tamponade?
Excess fluid accumulation in the pericardial cavity - impedes optimum fluid dynamics of the heart and can ultimately lead to cardiac failure
What named ganglia feed into the cardiac plexus?
Middle cervical and stellate ganglia
What chamber of the heart constitutes the base?
The left atrium
What chamber of the heart constitutes its apex?
The left ventricle
What is the fossa ovals?
Visible depression in the inter-atrial septum
What did the fossa ovals arise from?
The foramen ovale
What was the function of the foramen ovale?
To allow transmission of blood from on side of the heart directly to the other - along with the ductus arteriosus it allowed bypass of the lungs during placental oxygenation of blood during gestation
What is Atrial Septal Defect (ASD)?
One of the more common cardiac defects - defect in atrial septum allows pulmonary venous return to pass from left atrium to right directly
What is the septomarginal trabeculum also known as?
The moderator band
What is the purpose of the moderator band?
Allows innervation of papillary muscles to aid in opening of atrioventricular valves
What is the function of the chordae tendonae?
To prevent regurgitation of blood
Where do the coronary arteries and cardiac veins lie on the surface of the heart?
The atrioventricular (coronary) and interventricular (anterior and posterior) sulci
From what part of the aorta do the coronary arteries arise?
The root
Which pair of arteries anatomose in the coronary sulcus?
Marginal and right coronary artery
Which pair of arteries anatomose in the interventricular sulcus?
Circumflex and left coronary artery
The right coronary artery distributes blood to what structures?
- Right atrium and ventricle
- AV and SA node
- Bundle of His
The left coronary artery distributes blood to what structures?
- Both ventricles (plus septum)
- Left atrium
- SA node
Where is the SA node located?
Near the opening of the SVC in the right atrium
Where is the AV node located?
Lies in the inferior part of the interatrial septum
Where is the bundle of His located?
Within each side of the interventricular septal wall
What type of artery are the aorta and pulmonary trunk?
Elastic and conducting
What type of artery are the radial and femoral arteries?
Distributing and muscular
What tissue predominates the tunica media of arteries?
Smooth muscle