| regio occipitalis capitis | The surface region of the head corresponding to the outlines of the occipital bone. Synonym: regio occipitalis capitis. (05 Mar 2000) |
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| regio olfactoria tunicae mucosae nasi | The specialised olfactory receptive area that includes the upper one-third of the nasal septum and the lateral wall above the superior concha; it is lined with olfactory mucosa. Synonym: regio olfactoria tunicae mucosae nasi, olfactory region of tunica mucosa of nose, Schultze's membrane. (05 Mar 2000) |
| regio oralis | The region of the face including the lips and mouth. Synonym: regio oralis. (05 Mar 2000) |
| regio orbitalis | The region about the orbit. Synonym: regio orbitalis. (05 Mar 2000) |
| regio parietalis capitis | The surface region of the head corresponding to the outlines of the underlying parietal bone. Synonym: regio parietalis capitis. (05 Mar 2000) |
| regio pectoralis | The region of the chest demarcated by the outline of the pectoralis major muscle. See: pectoral region, regions of chest. Synonym: regio pectoralis. (05 Mar 2000) |
| regio perinealis | The regio at the lower end of the trunk, anterior to the sacral region and posterior to the pubic region between the thighs; it is divided into the anal triangle posteriorly and the urogenital triangle anteriorly. Synonym: regio perinealis. (05 Mar 2000) |
| regio plantaris | An alternate term for sole of foot. (05 Mar 2000) |
| regio presternalis | The part of the chest over the sternum. Synonym: regio presternalis. (05 Mar 2000) |
| regio pubica | The lower central region of the abdomen below the umbilical region. Synonym: hypogastrium, regio pubica. (05 Mar 2000) |
| regio respiratoria tunicae mucosae nasi | The area commencing at the vestibule of the nose lined with respiratory mucosa; with the exception of the olfactory mucusa, it includes the entire nasal cavity. Synonym: regio respiratoria tunicae mucosae nasi, respiratory region of tunica mucosa of nose. (05 Mar 2000) |
| regio sacralis | The area of the back overlying the sacrum. Synonym: regio sacralis. (05 Mar 2000) |
| regio scapularis | The area of the back corresponding to the outlines of the scapula. Synonym: regio scapularis. (05 Mar 2000) |
| regio sternocleidomastoidea | The region overlying the sternocleidomastoid muscle, including the lesser supraclavicular fossa. Synonym: regio sternocleidomastoidea. (05 Mar 2000) |
| regio suralis | sural region, sural region |