Blog

A patient is diagnosed with a tumor in the apex of his left lung (Pancoast tumor). The tumor mass is growing through the superior thoracic aperture, and is putting pressure on structures in the base of the neck. Physical examination reveals that the patient’s left pupil is much smaller than his right pupil, and his left upper eyelid is somewhat droopy. Based upon these findings, which one of the following structures is most likely to have been injured by the tumor?

Following recovery from a knife wound to the buttock (gluteal) area, a patient complains of difficulty walking. Physical examination reveals that the patient can stand upright on his left foot while his right foot is lifted off of the ground. However, when he attempts to stand on his right foot and lift his left foot off of the ground, he is unable to maintain his balance, and he falls to his left side. You recognize this as Trendelenburg Sign. In this patient, which one of the following nerves was most likely damaged?

A patient is diagnosed with a tumor in the apex of his left lung (Pancoast tumor). The tumor mass is growing through the superior thoracic aperture, and is putting pressure on structures in the base of the neck. Physical examination reveals that the patient has a weak, raspy voice. He also indicates that he has had a dry, unproductive cough for several weeks. Based upon these findings, which one of the following structures is most likely to have been injured by the tumor?

Radioactive Cu-64 decays with a half life of 12.8 days. If you began with 445. g of Cu-64, how much would be left after 30 days?

Tears produced during crying often cause the nose to “run” (drip fluid). This is due to the fact that tears are conveyed to the nasal cavity by the nasolacrimal duct, which has a distal opening into which one of the following structures?

During a procedure to remove a lipoma from a woman’s neck, you wish to anesthetize all of the cutaneous branches of the cervical plexus at the “nerve point” (punctum nervosum). Which one of the following locations is best to inject lidocaine for this purpose?

A patient presents at the dentist’s office complaining of a toothache. The dentist observes severe decay of the tooth indicated by the arrow in the image. Before attempting to remove this decay and put in a filling, the dentist desensitizes this tooth by anesthetizing the nerve that passes through which one of the following spaces?  

A newborn male child presents with the following findings: a hypoplastic (small) mandible, malformation of the external and middle ear, cleft palate and faulty dentition. This is most likely due to a problem in the development of the:

A woman presents with a painful ulceration of her hard palate (see image). What is the location of the cell bodies of the sensory neurons that provide pain sensation (GSA) to the area of this ulceration?  

Given the following reduction potentials and reduction reactions, rank the following metals from most active(left) to least active(right) Au3+  + 3e  –> Au      +1.50V Fe3+  + 3e  –> Fe       -0.036V Pb2+  +2e  –> Pb        -0.13V Cu2+  + 2e  –>  Cu      + 0.34V