| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
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| MDC | major diagnostic categories; Metoprolol in Dilated Cardiomyography [trial]; minimum detectable conce... |
| MDD | major depressive disorder; mean daily dose |
| MDE | major depressive episode |
| MHA | major histocompatibility antigen; May-Hegglin anomaly; Mental Health Association; methemalbumin; mic... |
| mastoid border of occipital bone | The margin of the occipital squama that articulates with the temporal bone. Synonym: margo mastoideus squamae occipitalis, mastoid margin of occipital bone. (05 Mar 2000) |
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| mastoid branch of occipital artery | <anatomy, artery> Mastoid branch of occipital artery, passing through the mastoid foramen; distribution, mastoid air cells; anastomosis, middle meningeal artery. Synonym: arteriae occipitalis, ramus mastoideus arteriae occipitalis, mastoid branch of occipital artery. (05 Mar 2000) |
| mastoid margin of occipital bone | The margin of the occipital squama that articulates with the temporal bone. Synonym: margo mastoideus squamae occipitalis, mastoid margin of occipital bone. (05 Mar 2000) |
| masto-occipital | Relating to the mastoid portion of the temporal bone and to the occipital bone, denoting the suture uniting them. Synonym: mastoccipital. (05 Mar 2000) |
| maximum occipital point | The point on the squama of the occipital bone farthest from the glabella. (05 Mar 2000) |
| medial occipital artery | <anatomy, artery> One of the terminal branches of the posterior cerebral artery; it is distributed, by several named branches, to the posterior corpus callosum and the medial and superolateral portions of the occipital lobe including the visual cortex. Synonym: arteria occipitalis medialis. (05 Mar 2000) |
| cervico-occipital | Relating to the neck and the occiput. (05 Mar 2000) |
| meningeal branch of occipital artery | <anatomy, artery> One of the variable branches of the occipital artery which may pass through the jugular or parietal foramina or condyloid canal to reach the dura mater and bone of the posterior cranial fossa, as well as the intracranial portions of the caudal four cranial neres. Synonym: ramus meningeus arteriae occipitalis. (05 Mar 2000) |
| childhood epilepsy with occipital paroxysms | A benign epilepsy syndrome characterised by frequent occipital spikes often activated by eye closure. It has a seizure semiology that includes visual manifestations; not always remitting later in life. (05 Mar 2000) |
| greater occipital nerve | <anatomy, nerve> Medial branch of the dorsal primary ramus of the second cervical nerve; sends branches to the semispinalis capitis and multifidus cervicis, but is mainly cutaneous, supplying the back part of the scalp. Synonym: nervus occipitalis major. (05 Mar 2000) |
| petro-occipital | Denoting the cranial suture between the occipital bone and the petrous portion of the temporal. Synonym: petroccipital. (05 Mar 2000) |
| petro-occipital fissure | A fissure between the petrous part of the temporal bone and the basilar part of the occipital bone that extends anteromedially from the jugular foramen; includes the jugular foramem (at its posterior end). Synonym: fissura petro-occipitalis, Ecker's fissure. (05 Mar 2000) |
| petro-occipital joint | Fibrocartilage filling the petro-occipital fissure. Synonym: synchondrosis petro-occipitalis. (05 Mar 2000) |
| posterior atlanto-occipital membrane | The fibrous membrane that attaches between the posterior arch of the atlas and the posterior margin of the foramen magnum. Synonym: membrana atlanto-occipitalis posterior. (05 Mar 2000) |
| spheno-occipital | Relating to the sphenoid bone and the basilar process of the occipital bone. Synonym: spheno-occipital, sphenoccipital. (05 Mar 2000) |