A. Frontal nerve (2x) B. Supraorbital artery C. Anterior ethmoid artery D. Anterior ethmoid nerve E. Superior ophthalmic artery F. Lacrimal artery G. Lacrimal nerve H. Lacrimal gland I. Olfactory bulb J. Olfactory tract K. Superior oblique muscle L. Levator palpebrae superioris muscle M. Trochlear nerve N. Optic nerve O. Optic chiasm P. Optic tract Q. Crus cerebri R. Substantia nigra S. Red nucleus T. Cerebral aqueduct U. Superior colliculus V. Collateral eminence W. Inferior sagittal sinus X. Falx cerebri Y. Superior sagittal sinus