Which is the largest nerve in the human body?
- AFemoral nerve
- BVagus nerve
- CSciatic nerve
- DMedian nerve
Formula sheets, the key method steps for every topic and 4 practice problems, with full solutions at the back.
Which is the largest nerve in the human body?
A footballer takes a blow to the outside of the planted knee. Which combination of injuries is classically called the "unhappy triad"?
Which hormone increases water reabsorption in the collecting ducts of the kidney?
A patient has taken high-dose prednisolone for a year. What is the state of the hypothalamic–pituitary–adrenal axis?
Answer: C · Sciatic nerve
The sciatic nerve (L4–S3) leaves the pelvis through the greater sciatic foramen and supplies the hamstrings and all the muscles below the knee. Skin on the inner side of the leg is supplied by the saphenous nerve instead.
Answer: B · Anterior cruciate ligament, medial collateral ligament and medial meniscus
A valgus force with rotation tears the MCL, the ACL and the medial meniscus, which is firmly attached to the MCL.
Answer: A · Antidiuretic hormone (ADH)
ADH (vasopressin) from the posterior pituitary inserts aquaporin-2 channels, making the collecting duct permeable to water and concentrating the urine.
Answer: B · ACTH is suppressed and the adrenal cortex has atrophied
Exogenous glucocorticoid suppresses CRH and ACTH, so the adrenal cortex atrophies. Stopping the drug suddenly can cause an adrenal crisis, so it is tapered.
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