_a_, Fissura prorea; _b_, frontal fissure; _c_, olfactory fissure;
_d_, _d′_, sulcus rhinalis; _e_, presylvian fissure; _f_,
precruciate fissure; _g_, postcruciate fissure; _h_, cruciate
fissure; _i_, lateral fissure (of Sylvius); _k_, _k′_, _k″_,
suprasylvian fissure; _l_, _l′_, _l″_, ectosylvian fissure; _m_,
fissura ansata minor; _n_, ectomarginal or collateral fissure; _o_,
fissura ansata; _p_, coronal fissure; _q_, ectolateral fissure; _r_,
medilateral fissure; _s_, entomarginal fissure. (After Ellenberger,
in Leisering’s Atlas.)
]
[Illustration: