Health Sciences 2300A/B Lecture Notes - Lecture 17: Superior Vena Cava, Inferior Vena Cava, Brachiocephalic Artery
1 May 2018
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Lecture 17 – The Systemic Circulation
FLOW OF THE BLOOD
Vascular Components
- The artery splits into a few branches and becomes slightly smaller
- Arterioles controls the amount of blood that passes to the capillaries
- Capillary bed is where transfer of gases, nutrients, and waste products occurs
- Oxygenated blood that’s red and picking up waste byproducts and transporting out through
the venule then funnels into a vein
GREAT VESSELS OF THE HEART
Great Vessels of the Systemic Circuit
Aorta
Takes away oxygenated blood from the heart
Superior Vena Cava
Brings back blood to the heart from structures above the heart
Inferior Vena Cava
Brings back blood to the heart from structures below the heart
Divisions of the Aorta
Ascending Aorta Coronary arteries supply the cardiac muscle tissues
Arch of aorta Branches come off of this to supply head, neck, upper limb
Descending aorta (thoracic) Passes through the posterior mediastinum
Descending aorta (abdominal) Splits and supplies the lower limbs
Branches of the Aortic Arch
- You start off with vessels that fuse into something else – the right side can get rid of vessels
before the left side can
Brachiocephalic trunk
Splits into two additional structures (right common carotid &
subclavian) – adds a bit of extra length to the right side
Tributaries of SVC
- Structures that drain into the SVC
- L/R internal and external jugular veins meet up with the L/R subclavian vein
- Also have brachiocephalic veins on the L/R side which join together and drain into the
superior vena cava
VESSELS OF THE HEAD AND NECK
Neck Arteries
Vertebral
Runs through the neck and supplies the head
External Carotid Artery
Facial
Comes across the angle of the mandible, to the corner of the mouth, and up to the
nose
Maxillary
Deep near to the temporal mandibular joint
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Document Summary
The artery splits into a few branches and becomes slightly smaller. Arterioles controls the amount of blood that passes to the capillaries. Capillary bed is where transfer of gases, nutrients, and waste products occurs. Oxygenated blood that"s red and picking up waste byproducts and transporting out through the venule then funnels into a vein. Aorta takes away oxygenated blood from the heart. Superior vena cava brings back blood to the heart from structures above the heart. Inferior vena cava brings back blood to the heart from structures below the heart. Ascending aorta coronary arteries supply the cardiac muscle tissues. Arch of aorta branches come off of this to supply head, neck, upper limb. Descending aorta (thoracic) passes through the posterior mediastinum. Descending aorta (abdominal) splits and supplies the lower limbs. You start off with vessels that fuse into something else the right side can get rid of vessels before the left side can.
