Wrench adjusting vertebrae on a spine.

Photo-illustration of a brain.

Antibodies attached to a cell surface.

Medical illustration of brain pathways affected by Alzheimer's disease. The numbers correspond to the regions as follows: 1. entorhinal cortex; 2. perforant pathway; 3. dentate gyrus; 4. hippocampus; 5. subiculum. The arrow shows the loss of neurons. (c) Cavallini James

Photo-illustration of a mastectomy: a statue of a woman is shown at various points during the procedure.

Photo-illustration of a TRAM (transverse rectus abdominis musculocutaneous) flap breast reconstruction.

Photo-illustration of a gluteus flap breast reconstruction.

Photo-illustration of a latissimus dorsi flap breast reconstruction.

Illustration of a person's hands drawing liquid into a syringe from a vial.

Illustration of a person's hands shaking pills out of a medication bottle. One hand is holding the bottle, and the person is pouring the pills into the open palm of the other hand.

Illustration of surgeons at work during an operation.

Conceptual illustration of antibiotics: a hand holding a syringe filled with liquid antibiotics, a hanging IV drip with liquid medication, and various floating pills are all poised beneath a gathering cloud of many different bacteria.

Conceptual illustration of depression: a sketch of a pained face with corresponding neurons and a brain are shown.

Medical illustration of a stroke, also called a cerebrovascular accident, and its consequences. An elderly woman is shown with the causative cerebral artery highlighted. Also shown are the affected neuronal connections and a view of her brain with the resulting lesion.

Medical illustration of a person's eye and the path of the tear ducts on the face.

Medical illustration of osteoarthritis. This term refers to arthritis that is characterized by degeneration of the cartilage and bone of the joints.

Illustration of a model of a prion, a symbol of Creutzfeldt-Jakob disease. (c) Cavallini James

Medical illustration of scintimammography for the detection of malignant breast lesions. This procedure uses a radioactive tracer to identify abnormal cells based on metabolic differences between cancerous and non-cancerous cells. It is usually done when the results of an x-ray mammography are inconclusive.

Medical illustration of the heart, showing an infarct. An infarct is an area of necrosis in a tissue or organ due to obstruction of the local circulation. (c) Duval

Illustration of an adult brain, sagittal and frontal sections, showing a subarachnoid hematoma. A result of vascular rupture, a subarachnoid hematoma is a mass of usually clotted blood that forms in the subarachnoid space of the brain, which lies beneath the arachnoid membrane of the brain and spinal cord.