A 3-Year-Old Boy Is Brought to the Emergency Department After

question 123

Multiple Choice

A 3-year-old boy is brought to the emergency department after falling off a jungle gym.  The boy tried to catch himself and landed on his outstretched arms.  He did not lose consciousness and has been crying inconsolably since he fell.  Pulse is 140/min; all other vital signs are within normal limits.  Physical examination reveals tenderness and swelling over the anterior portion of his right shoulder with crepitus over the swollen area.  An x-ray of his right shoulder is shown below. Tension from which of the following muscles is most likely responsible for displacement of the distal bone fragment?

• A)Biceps
• B)Deltoid
• C)Levator scapulae
• D)Pectoralis minor
• E)Teres minor

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Definitions:

Lymphocyte

A type of white blood cell that is part of the immune system, helping the body to fight infection and disease.

Neutrophil

A type of white blood cell important in defending the body against infection and disease.

Blood Smear

A laboratory test procedure that involves spreading a thin layer of blood on a microscope slide for the purpose of examining blood cells under a microscope.

Eosinophils

A type of white blood cell that plays a key role in the body's immune response, especially in combating parasitic infections and in allergic reactions.