| crest of petrous part of temporal bone | The margin that separates the anterior and posterior surfaces of the petrous part of the temporal bone and the lateral part of the middle cranial fossa from the posterior cranial fossa. Synonym: margo superior partis petrosae ossis temporalis, crest of petrous part of temporal bone. (05 Mar 2000) |
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| posterior border of petrous part of temporal bone | The margin of the petrous part of the temporal bone that extends from the apex to the jugular notch; it articulates with the basal and jugular portions of the occipital bone. Synonym: margo posterior partis petrosae ossis temporalis. (05 Mar 2000) |
| posterior surface of petrous part of temporal bone | The surface of the petrous part of the temporal bone that contributes to the posterior cranial fossa. Synonym: facies posterior partis petrosae ossis temporalis. (05 Mar 2000) |
| superior border of petrous part of temporal bone | The margin that separates the anterior and posterior surfaces of the petrous part of the temporal bone and the lateral part of the middle cranial fossa from the posterior cranial fossa. Synonym: margo superior partis petrosae ossis temporalis, crest of petrous part of temporal bone. (05 Mar 2000) |
| inferior surface of petrous part of temporal bone | Inferior surface of petrous part of the temporal bone; the portion of the petrous part of the temporal bone that contributes to the external base of the skull. Synonym: facies inferior partis petrosae ossis temporalis. (05 Mar 2000) |
| apex | <dentistry> The very bottom of the root of your tooth. (08 Jan 1998) |
| apex auriculae | A point projecting upward and posteriorly from the free outcurved margin of the helix a little posterior to its upper end. Synonym: apex auriculae, apex satyri, Woolner's tip. (05 Mar 2000) |
| apex beat | The visible and/or palpable pulsation made by the apex of the left ventricle as it strikes the chest wall in systole; normally in the fifth intercostal space, about 10 cm to the left of the median line. (05 Mar 2000) |
| apex capitis fibulae | The pointed upper end of the fibular head to which is attached the arcuate popliteal ligament and part of the biceps femoris tendon. Synonym: apex capitis fibulae, styloid process of fibula. (05 Mar 2000) |
| apex cartilaginis arytenoideae | The pointed upper end of the cartilage which supports the corniculate cartilage and the aryepiglottic fold. Synonym: apex cartilaginis arytenoideae. (05 Mar 2000) |
| apex cordis | The blunt extremity of the heart formed by the left ventricle. See: apex beat. Synonym: apex cordis, vertex cordis. (05 Mar 2000) |
| apex cornus posterioris | The pointed extremity of each posterior gray column or cornu of the spinal cord. Synonym: apex cornus posterioris, caput cornus, tip of posterior horn. (05 Mar 2000) |
| apex cuspidis dentis | The tip of the peaklike projections from the crown of a tooth. Synonym: apex cuspidis dentis. (05 Mar 2000) |
| apex dentis | The tip of the dens of the axis to which is attached the apical ligament of the dens. Synonym: apex dentis. (05 Mar 2000) |
| apex impulse | Conventionally the lowermost, leftmost area of cardiac pulsation that is usually palpable. (05 Mar 2000) |