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Questions and Answers
What is the origin of sympathetic supply to the suprarenal medulla?
What is the origin of sympathetic supply to the suprarenal medulla?
- Hypogastric ganglia
- Inferior mesenteric ganglia
- L1, L2, and L3 segments of the spinal cord
- T10 and T11 segments of the spinal cord (correct)
What is the main action of adrenaline released by the suprarenal medulla?
What is the main action of adrenaline released by the suprarenal medulla?
- Regulation of heart rate
- Metabolic actions of the body (correct)
- Contraction of blood vessels
- Relaxation of blood vessels
What percentage of adrenaline is released by stimulation of sympathetic nerves to the suprarenal medulla?
What percentage of adrenaline is released by stimulation of sympathetic nerves to the suprarenal medulla?
- 60%
- 20%
- 40%
- 80% (correct)
Where do the sympathetic nerves to the pelvis originate?
Where do the sympathetic nerves to the pelvis originate?
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What is the function of sympathetic supply to the urinary bladder?
What is the function of sympathetic supply to the urinary bladder?
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Study Notes
Sympathetic Supply to Suprarenal Medulla
- The origin of sympathetic supply to the suprarenal medulla is the thoracic segments T5-T12 of the spinal cord.
Adrenaline and Suprarenal Medulla
- The main action of adrenaline released by the suprarenal medulla is to prepare the body for "fight or flight" responses.
- 80% of adrenaline is released by stimulation of sympathetic nerves to the suprarenal medulla.
Sympathetic Nerves to the Pelvis
- The sympathetic nerves to the pelvis originate from the lumber region (L1-L2) of the spinal cord.
Sympathetic Supply to the Urinary Bladder
- The function of sympathetic supply to the urinary bladder is to relax the bladder wall and contract the internal urethral sphincter, allowing for urine storage.
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