O: Glossary

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Oocciput: The back part of the head.

Oligodendroglia: Non-nerve cells (see glia) forming part of the supporting structure of the central nervous system.

Oligodendroglioma: A growth of new cells derived from the oligodendroglia.

Orbital: Related to the bony eye socket and surrounding area.

Osteoma: A benign tumor of bone.

Osteomyelitis: Inflammation of bone due to infection, which may be localized or generalized.

Osteophytectomy: Surgical removal of osteophytes (bony outgrowths). Osteophytes may develop on the upper and/or lower edges of the vertebral bodies, often causing pressure on the spinal cord.