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Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.
Play USMLE Audio MP3 56 12 Vascular Receptors Below
Begin 56 12 Vascular Receptors Transcription
Now let’s talk about vascular receptors. What are the two vascular chemoreceptors?
- Aortic and carotid bodies.
What two factors are aortic bodies responding to?
- Lowered blood oxygen and raised CO2
What three factors are carotid bodies responding to? (Please pause the tape)
- First lowered blood oxygen, Second raised Carbon dioxide. Third lowered pH
What are the two baroreceptors that is pressure sensitive receptor?
- Aortic arch and carotid sinus
What cranial nerve serves the aortic arch?
- The Tenth cranial nerve also known as the Vagus nerve
And once the signal originates in the aortic arch to where does the tenth cranial nerve carry the signal?
- To the medulla
What nerve serves the carotid sinus?
- The ninth cranial nerve also known as the glossopharyngeal nerves
Where does the ninth nerve carry the signal to?
- The medulla
There are also CNS or central nervous system chemoreceptors what are they reacting to?
- The CNS chemo receptors react to carbon dioxide and pH of the brain interstitial fluid
Unlike vascular chemoreceptors what stimulus does not elicit response from CNS chemo receptors?
- Blood oxygen
Student doctor please pause the tape and summarize the information on the Vascular receptors.
- The first question asked for the two vascular chemoreceptors. The two vascular chemo receptors are the aortic and carotid bodies. Aortic bodies respond to lowered blood oxygen and raised CO2. Carotid bodies respond to lowered blood oxygen, raised Carbon dioxide and lowered pH. The Aortic arch and carotid sinus are the two baroreceptors. The Tenth cranial nerve also known as the Vagus nerve serves the aortic arch. Once the signals originate in the aortic arch, the tenth cranial nerve carries the signal to the medulla. The ninth cranial nerve also known as the glossopharyngeal nerve serves the carotid sinus. The ninth nerve carries the signal to the medulla. The CNS chemo receptors react to carbon dioxide and pH of the brain interstitial fluid. Unlike vascular chemoreceptors, blood oxygen does not elicit response from CNS chemo receptors.
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