| apex linguae | The anterior extreme of the tongue which can be made pointed for sensing or probing and which rests against the lingual aspect of the incisor teeth. Synonym: apex linguae. (05 Mar 2000) |
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| apex nasi | Anteriormost pointed end of external nose. Synonym: apex nasi. (05 Mar 2000) |
| APEX nuclease | <enzyme> DNA repair enzyme having both exonuclease and apurinic-apyrimidinic endonuclease activities; apex is from mouse; rapen from rat has high homology with apex Registry number: EC 3.1.- Synonym: rapen redox factor (26 Jun 1999) |
| apex of arytenoid cartilage | The pointed upper end of the cartilage which supports the corniculate cartilage and the aryepiglottic fold. Synonym: apex cartilaginis arytenoideae. (05 Mar 2000) |
| apex of cusp of tooth | The tip of the peaklike projections from the crown of a tooth. Synonym: apex cuspidis dentis. (05 Mar 2000) |
| apex of dens | 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 of head of fibula | 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 of heart | The blunt extremity of the heart formed by the left ventricle. See: apex beat. Synonym: apex cordis, vertex cordis. (05 Mar 2000) |
| apex of lung | The rounded, upper extremity of each lung that extends into the cupula of the pleura. Synonym: apex pulmonis. (05 Mar 2000) |
| apex of orbit | The posterior part of the orbit into which the optic canal opens; forms the tip of the pyramidal-shaped space. (05 Mar 2000) |
| apex of patella | The pointed lower end of the patella from which the ligamentum patellae passes to insert on the tibial tuberosity. Synonym: apex patellae. (05 Mar 2000) |
| apex of prostate | The lowermost part of the prostate, situated above the urogenital diaphragm. Synonym: apex prostatae. (05 Mar 2000) |
| apex of sacrum | The tapering lower end of the sacrum that articulates with the coccyx. Synonym: apex ossis sacri. (05 Mar 2000) |
| apex of the posterior horn | 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 of urinary bladder | The junction of the superior and anteroinferior surfaces of the bladder, continuous above with the median umbilical ligament. Synonym: apex vesicae. (05 Mar 2000) |