| A>B | air greater than bone [conduction] |
|---|---|
| A&BC | air and bone conduction |
| ABM | adjusted body mass; alveolar basement membrane; autologous bone marrow |
| ABMI | autologous bone marrow transplantation |
| ABMT | American Board of Medical Toxicology; autologous bone marrow transplantation |
| occipital plane | The external surface of the occipital bone above the superior nuchal line. Synonym: planum occipitale. (05 Mar 2000) |
|---|---|
| occipital plexus | An autonomic plexus on the occipital artery derived from the external carotid plexus. Synonym: plexus occipitalis. (05 Mar 2000) |
| occipital point | The most prominent posterior point on the occipital bone above the inion. (05 Mar 2000) |
| occipital pole | The most posterior promontory of each cerebral hemisphere; the apex of the occipital lobe. Synonym: polus occipitalis cerebri, occipital pole. Pelvic pole, the breech end of the foetus. (05 Mar 2000) |
| occipital pole of cerebrum | The most posterior promontory of each cerebral hemisphere; the apex of the occipital lobe. Synonym: polus occipitalis cerebri, occipital pole. Pelvic pole, the breech end of the foetus. (05 Mar 2000) |
| occipital region of head | The surface region of the head corresponding to the outlines of the occipital bone. Synonym: regio occipitalis capitis. (05 Mar 2000) |
| occipital sinus | An unpaired dural venous sinus commencing at the confluence of the sinuses and passing downward in the base of the falx cerebelli to the foramen magnum. Synonym: sinus occipitalis. (05 Mar 2000) |
| occipital triangle | A triangle of the neck bounded by the trapezius, the sternocleidomastoid, and the omohyoid muscles. See: inferior occipital triangle. (05 Mar 2000) |
| occipital vein | <anatomy, vein> Drains the occipital region and empties into the internal jugular vein or the suboccipital plexus. Synonym: vena occipitalis. (05 Mar 2000) |
| temporo-occipital | Relating to the temporal and the occipital bones or regions. (05 Mar 2000) |
| third occipital nerve | <anatomy, nerve> Medial branch of the dorsal primary ramus of the third cervical nerve; this is usually joined with the greater occipital, but may exist as an independent nerve supplying cutaneous branches to the scalp and nucha. Synonym: nervus occipitalis tertius. (05 Mar 2000) |
| transverse occipital sulcus | The posterior, vertical limb of the intraparietal sulcus. Synonym: sulcus occipitalis transversus. (05 Mar 2000) |
| external occipital crest | A ridge extending from the external occipital protuberance to the border of the foramen magnum. Synonym: crista occipitalis externa, linea nuchae mediana. (05 Mar 2000) |
| external occipital protuberance | A prominence about the centre of the outer surface of the squamous portion of the occipital bone, giving attachment to the ligamentum nuchae. Synonym: protuberantia occipitalis externa. (05 Mar 2000) |
| lateral occipital artery | <anatomy, artery> One of the terminal branches of the posterior cerebral artery; it supplies, by several named branches, the lateral portions of the temporal lobe. Synonym: arteria occipitalis lateralis. (05 Mar 2000) |