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.

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