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Left Lateral View of Dissected Brain, Orbit, and Deep Face

Surgical Correlation


Left lateral view of dissected brain, orbit, and deep face. The frontal lobe has been sectioned sagittally to reveal the corpus callosum and the overlying cingulate gyrus of the limbic lobe. The central sulcus separates the precentral gyrus (primary motor cortex) of the frontal lobe from the postcentral gyrus (primary somatosensory cortex) of the parietal lobe. The left temporal lobe has been dissected to reveal the temporal or inferior horn and choroid plexus of the lateral ventricle. The atrium of the lateral ventricle is a transition space between the body of the lateral ventricle and its occipital and temporal horns. The superior sagittal sinus can be seen along the convexity of the falx cerebri separating the cerebral hemispheres. It ends posteriorly at the confluens or torcula. Here, the transverse sinus extends laterally to continue as the sigmoid sinus and jugular bulb before exiting the jugular foramen as the internal jugular vein. Anteriorly, the frontal sinus has been opened. Inferior to it is the roof of the orbit containing the frontal and supraorbital nerve, levator palpebrae superioris and superior rectus muscles. The optic nerve emerges from the posterior surface of the eyeball and branches of the ophthalmic artery can be seen coursing in the orbit. The lateral rectus and distal portion of the inferior oblique muscles are also in view as is the lacrimal gland. Bone around the pterygopalatine fossa has been removed to expose the maxillary nerve and some of its branches, namely, the infraorbital nerve to the floor of the orbit, the posterior superior alveolar nerve to the posterior wall of the maxillary sinus and molar teeth, and palatine nerves to the hard and soft palate. The maxillary artery is shown traversing the infratemporal fossa and gives off the sphenopalatine artery to the nasal cavity. (Image courtesy of M Nunez)