Oblique
/əˈbliːk/
Muscles that are slanted or at an angle, such as the abdominal obliques.
Obturator
/ˈɒbtjʊreɪtər/
Relating to the large opening in the hip bone (obturator foramen) or the muscles nearby.
Occipital
/ɒkˈsɪpɪtəl/
Relating to the back of the head or the occipital bone of the skull.
Occipitofrontalis
/ɒkˌsɪpɪtoʊfrʌnˈteɪlɪs/
The muscle which covers parts of the skull, consisting of an occipital belly and a frontal belly.
Ocular
/ˈɒkjʊlər/
Relating to the eye or the sense of sight.
Oculomotor
/ˌɒkjʊloʊˈmoʊtər/
The third cranial nerve, which controls most of the eye's movements.
Odontoid
/oʊˈdɒntɔɪd/
Tooth-like; specifically the process of the second cervical vertebra (the dens).
Olecranon
/oʊˈlɛkrənɒn/
The bony projection of the ulna at the elbow.
Olfactory
/ɒlˈfæktəri/
Relating to the sense of smell.
Omentum
/oʊˈmɛntəm/
A fold of peritoneum connecting the stomach with other abdominal organs.
Omohyoid
/ˌoʊmoʊˈhaɪɔɪd/
A muscle that depresses the hyoid, connecting the shoulder (omos) to the hyoid bone.
Oocyte
/ˈoʊəsaɪt/
A cell in an ovary which may undergo meiotic division to form an ovum.
Oogenesis
/ˌoʊəˈdʒɛnɪsɪs/
The production or development of an ovum.
Ophthalmic
/ɒfˈθælmɪk/
Relating to the eye.
Opponens
/əˈpoʊnənz/
Muscles that allow for 'opposition' movement, like the thumb touching the pinky.
Optic
/ˈɒptɪk/
Relating to the eye or vision, specifically the second cranial nerve.
Ora Serrata
/ˈɔːrə sɛˈreɪtə/
The serrated junction between the retina and the ciliary body.
Orbicularis Oculi
/ɔːrˌbɪkjʊˈlɛərɪs ˈɒkjʊlaɪ/
The ring-like muscle that closes the eyelids.
Orbicularis Oris
/ɔːrˌbɪkjʊˈlɛərɪs ˈɔːrɪs/
The muscle complex around the mouth that puckers the lips.
Orbit
/ˈɔːrbɪt/
The bony cavity in the skull that contains the eyeball.
Organ
/ˈɔːrɡən/
A part of an organism that is typically self-contained and has a specific vital function.
Organelle
/ˌɔːrɡəˈnɛl/
Any of a number of organized or specialized structures within a living cell.
Origin
/ˈɒrɪdʒɪn/
The fixed attachment point of a muscle, which does not move during contraction.
Oropharynx
/ˌɔːroʊˈfærɪŋks/
The part of the pharynx that lies between the soft palate and the hyoid bone.
Os
/ɒs/
The Latin term for a bone, or an opening/mouth (like the cervical os).
Ossicle
/ˈɒsɪkəl/
A small bone, especially one of the three in the middle ear.
Ossification
/ˌɒsɪfɪˈkeɪʃən/
The process of bone formation.
Osteoblast
/ˈɒstioʊblæst/
A cell that secretes the matrix for bone formation.
Osteoclast
/ˈɒstioʊklæst/
A large multinucleate bone cell which absorbs bone tissue during growth and healing.
Osteocyte
/ˈɒstioʊsaɪt/
A bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted.
Osteon
/ˈɒstiɒn/
The fundamental functional unit of much compact bone.
Otic
/ˈoʊtɪk/
Relating to the ear.
Otolith
/ˈoʊtəlɪθ/
Small calcium carbonate crystals in the inner ear that help with balance.
Ovary
/ˈoʊvəri/
A female reproductive organ in which ova or eggs are produced.
Ovum
/ˈoʊvəm/
A mature female reproductive cell.