ABBREVIATIONS. 511 



PRECOM. AREA., precommissural area. 

 PRIM. F., primary (preclival) fissure of cerebellum. 

 PSAL. or PSA LT., psalterium (hippocampal commissure). 

 PSAL. v., PSAL. D., psalterium ventrale and dorsale. 

 PSEUDOSTL. F., pseudosylvian fissure (Sirenia). 

 PYR., pyramids. 



PYRAMID, pyramid of cerebellum. 

 PYR. L., pyriform lobe. 



PYR. L. ANT., PYR. L. POST., anterior and posterior parts of pyriform lobe. 

 RAMUS POST. SUP., ramus postcentralis superior of intraparietal sulcus. 

 RHIN. F., rhinal fissure. 

 RHIN. F. ANT., anterior rhinal fissure. 

 RHIN. F. POST., posterior rbinal fissure. 

 ROOT VALV. CER., root of the valvula cerebelli. 

 ROST. CORP. CALL., rostrum of corpus callosum. 

 SAC. INF., saccus infundibuli. 

 SAC. VASC., saccus vasculosus. 

 SECUN. F., secondary fissure of the cerebellum. 

 SNU GYR., second arcuate gyrus of Leuret. 

 SEPT. or SEPT. LUCID., septum lucidum. 

 SOFT. COMM. or COMM. MOL., soft commissure. 

 SPLEN. or SPL., splenium of corpus callosum. 

 s. s. P., posterior branch of the supra-sylvian sulcus. 

 SUP. GENU, superior genu of the central sulcus. 



s., s'., or SYL. F., the various modifications of the Sylvian and pseudo- 

 sylvian fissures. 



SYL. ECTOS. COMP., sylvio-ectosylvian complex. 



SYL. SUPRAS. COM., sylvio-suprasylvian complex (true Sylvian fissure). 

 SULC. ANS., ansate sulcus. 

 SULC. ANS. MIN., minor ansate sulcus. 

 SULC. ARC., sulcus arcuatus. 

 SULC. BISECT, or SULC. BisEC., bisector sulcus. 

 SULC. CALC. or CAL., calcarine sulcus. 

 SULC. CALL. MARG., calloso-marginal sulcus. 

 SULC. CENT., central (Rolando's) sulcus. 

 SULC. COLL., collateral sulcus. 

 SULC. COMP., compensatory sulcus. 

 SULC. COR., coronary sulcus. 

 SULC. COR. LAT., or COR. L., corono-lateral sulcus. 

 SULC. CR. or CRU., crucial sulcus. 

 SULC. DIAG., diagonal sulcus. 

 SULC. ECTOLAT., ectolateral sulcus. 



SULC. ECTOSYL., posterior ectosylvian sulcus (fig. 135), and ectosylvian 

 arc. 



