| Sa | the most anterior point of the anterior contour of the sella turcica [point]; saline; Staphylococcus... |
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| ACA | Anterior Cerebral Artery |
| A-COM | Anterior COMmunicating artery |
| AICA | Anterior Inferior Cerebellar Artery; Hemifacial Spasm |
| AIIS | Anterior Inferior Iliac Spine |
| crista nasalis | The midline ridge in the floor of the nasal cavity, formed by the union of the paired maxillae and palatine bones; the vomer attaches to the crest. Synonym: crista nasalis, saemicrista incisiva. (05 Mar 2000) |
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| crista obturatoria | A ridge that extends from the pubic tubercle to the acetabular notch, giving attachment to the pubofemoral ligament of the hip joint. Synonym: crista obturatoria. (05 Mar 2000) |
| crista occipitalis externa | 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) |
| crista occipitalis interna | A ridge running from the internal occipital protuberance to the posterior margin of the foramen magnum, giving attachment to the falx cerebelli. Synonym: crista occipitalis interna. (05 Mar 2000) |
| crista palatina | A transverse ridge near the posterior border of the bony palate, located on the inferior surface of the horizontal plate of the palatine bone. Synonym: crista palatina. (05 Mar 2000) |
| crista phallica | A longitudinal fold on the posterior wall of the urethra extending from the uvula of the bladder through the prostatic urethra; prominent in its midportion is the seminal colliculus. Synonym: crista phallica, crista urethralis masculinae. (05 Mar 2000) |
| crista pubica | The rough anterior border of the body of the pubis, continuous laterally with the pubic tubercle. Synonym: crista pubica. (05 Mar 2000) |
| crista quarta | A ridge that projects into the posterior end of the lateral saemicircular duct of the labyrinth. (05 Mar 2000) |
| crista sacralis | One of three rough irregular ridges on the posterior surface of the sacrum; median sacral crest; lateral sacral crests. Synonym: crista sacralis. (05 Mar 2000) |
| crista sacralis mediana | An unpaired crest formed by the fused spinous processes of the upper four sacral vertebrae. Synonym: crista sacralis mediana. (05 Mar 2000) |
| crista sphenoidalis | A vertical ridge in the midline of the anterior surface of the sphenoid bone that articulates with the perpendicular plate of the ethmoid bone. Synonym: crista sphenoidalis. (05 Mar 2000) |
| crista spiralis | The thickened periosteal lining of the bony cochlea forming the outer wall of the cochlear duct to which the basal lamina attaches. Synonym: crista spiralis, ligamentum spirale cochleae, spiral crest. (05 Mar 2000) |
| crista supracondylaris lateralis | The distal sharp portion of the lateral margin of the humerus. Synonym: crista supracondylaris lateralis, lateral epicondylar crest, lateral epicondylar ridge, lateral supracondylar crest. (05 Mar 2000) |
| crista supracondylaris medialis | The distal sharp portion of the medial margin of the humerus. Synonym: crista supracondylaris medialis, medial epicondylar crest, medial epicondylar ridge, medial supracondylar crest. (05 Mar 2000) |
| crista supramastoidea | The ridge that forms the posterior root of the zygomatic process of the temporal bone. Synonym: crista supramastoidea. (05 Mar 2000) |