| basis patellae | The superior border of the patella to which the tendon of the rectus femoris attaches. Synonym: basis patellae. (05 Mar 2000) |
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| basis pedunculi | The base of the midbrain consisting of the crus cerebri and substantia nigra. See: cerebral peduncle. (05 Mar 2000) |
| basis phalangis | The expanded proximal end of each phalanx in the hand or foot that articulates with the head of the next proximal bone in the digit. Synonym: basis phalangis. (05 Mar 2000) |
| basis prostatae | The broad upper surface of the prostate contiguous with the bladder wall. Synonym: basis prostatae. (05 Mar 2000) |
| basis pulmonis | The lower concave part of the lung that rests upon the convexity of the diaphragm. Synonym: basis pulmonis. (05 Mar 2000) |
| basis pyramidis renis | The outer broad part of a renal pyramid that lies next to the cortex. Synonym: basis pyramidis renis. (05 Mar 2000) |
| basis stapedis | The flat portion of the stapes that fits in the oval window. Synonym: basis stapedis, footplate, foot-plate. (05 Mar 2000) |