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Sensory Supply to the Hand

This Medcomic depicts the cutaneous innervation of the hand. The ulnar nerve supplies half of the fourth digit and the entire fifth digit on the dorsal and palmar aspects of the hand. The ulnar nerve supply extends proximally to the wrist. Dorsally, the median nerve...

Chickenpox vs. Shingles

The varicella-zoster virus causes varicella (chickenpox) and shingles (herpes zoster). It is very contagious. Chickenpox is usually a childhood infection that begins with a prodrome of fever, headache, and malaise followed by a generalized vesicular rash. It is...

Ectopic Pregnancy

In ectopic pregnancy, implantation occurs outside of the uterus. The most common site is the fallopian tube, but other possible sites include the pelvic or abdominal cavity, uterine cornu, cervix, or ovary. Risk factors include previous ectopic pregnancy, history of...

Barrett Esophagus

Barrett esophagus is a condition in which intestinal metaplastic columnar epithelium replaces the stratified squamous epithelium that normally lines the distal esophagus. The condition develops as a consequence of chronic gastroesophageal reflux disease (GERD) due to...

Normal Pressure Hydrocephalus

Normal pressure hydrocephalus (NPH) is a gradual accumulation of cerebrospinal fluid (CSF) that causes the ventricles of the brain to enlarge. The condition occurs with a normal or slightly elevated CSF pressure. NPH is characterized by a classic triad of dementia,...

Wolff–Parkinson–White syndrome

Wolff-Parkinson-White syndrome (WPW) is a pre-excitation syndrome of intermittent tachycardia that results from an accessory pathway (the bundle of Kent) directly connecting the atria and the ventricles. The anomalous pathyway allows electrical activity to bypass the...

Pen the Doctor Borrowed (PTDB)

Pen the Doctor Borrowed (PTDB) is a condition that occurs when a student loans their pen to a preceptor and never sees it returned. Common symptoms include anxiety, diaphoresis, and decreased funds due to new pen purchases. PTDB affects millions of students every day....

Types of Jaundice

Jaundice is a yellow discoloration of the skin and mucous membranes caused by an excess accumulation of bilirubin in the blood. Bilirubin (a tetrapyrrole) is a product of red blood cell (RBC) breakdown. Jaundice becomes visible when the bilirubin level is...

Scabies

Scabies is an infestation of the skin by the Sarcoptes scabiei mite. It causes generalized intractable pruritus with a characteristic distribution pattern. Risk factors include immunosuppression and crowded living conditions. Scabies is easily transmitted through skin...