Optic Chiasm

Area where optic nerves cross over, located just above the pituitary gland, which can be compressed by pituitary tumors and hinder eyesight. At the optic chiasm, nerve fibers from half of each retina cross over to the opposite side of the brain. The fibers from the...

Optic Nerves

Nerves which connect to the eyes providing one’s sense of sight. The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina. The retina is the nerve layer that lines the back of the eye that senses light and creates...

Orthopedics

The medical specialty concerned with the preservation, restoration, and development of form and function of the musculoskeletal system, extremities, spine, and associated structures by medical, surgical, and physical methods. A surgical specialty that utilizes...

Osteoporosis

A condition of reduced bone mass, with decreased outer thickness and a decrease in the number and size of the spongy structures in the bone (but normal chemical composition), resulting in increased fracture incidence. Osteoporosis is classified as primary (Type 1,...