OCCIPITAL
refers to the posterior (i.e., back) of the head; the bone located at the back and base of the cranium
OCCLUSAL
a relative term referring to the part of the mouth or tooth that is closer to the crown of the tooth
OCCLUSION
relationship between the upper and lower portions of the teeth
OLFACTION
smelling
OPPOSABLE THUMB
a thumb that is able to rotate along its long axis and can grip objects
ORBIT
a cavity in the face that protects the eyes and its associated muscles and nerves
ORGANISM
a functional unit of animal or plant life. An organism can consist of one living cell, such as algae, or many living cells, such as a single human being
ORIGIN
[muscle origin] the point from which a muscle arises and is not involved in the movement or action of the muscle
OS
bone
OS COXA
[syn. pelvis, hip bone, or innominate] [sing. os coxa] formed of two halves, each consisting of three fused bones: ilium, ischium, and pubis
OSSICLE
a small, extra bone
OSTEOARTHRITIS
disease process that affects both bone and cartilage with inflamation and destruction
OSTEOBLAST
a cell that produces or deposits bone tissue by depositing protein
OSTEOCLAST
a cell that erodes bone tissue
OSTEOPHYTE
a small, abnormal bone growth that occurs on the surface of the bone