Anatomy and Imaging of the Cranial Nerves: A Neuroanatomic by André Leblanc (auth.)

By André Leblanc (auth.)

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Extra resources for Anatomy and Imaging of the Cranial Nerves: A Neuroanatomic Method of Investigation Using Magnetic Resonance Imaging (MRI) and Computed Tomography (CT)

Sample text

Olfactory trigone (I) Ophthalmic artery Anterior clinoid process ' - - ' ' - : - - - - -+_ Optic ch iasm (II) Midd le cerebral artery Anterior cerebral artery ............ -,--------. 6a-f. Axial (a), sagittal (b-d) and frontal (e, f) sections of optic pathways by magnetic resonance imaging (MRI) and computed tomography (CT), visualizing optic nerve, chiasm and tract Optic nerve (II) 25 Chiasmatic cistern, optic chiasm, optic tracts, optic pathways Anatomy Imaging Each optic tract is formed by the temporal bundle derived from the retina of the same side, the nasal bundle derived from the retina of the opposite side and by macular fibers derived from both retinae.

Course of trochlear nerve Horizontal, axial and sagittal views (MRI, CT) .... Anatomic dissections of oculomotor nerves ....... Axial view (MRI) and sagittal diagram ........... 49 49 49 51 52 53 54 55 56 57 58 The trochlear nerve is the most slender of the cranial nerves. It is a motor nerve and supplies only the superior oblique muscle. Its nucleus of origin is situated in the tegmentum of the mesencephalon at the level of the inferior colliculi, below the nucleus of the oculomotor nerve and behind the medial longitudinal fascicle, which it indents.

Diagram and magnetic resonance imaging (MRI) ................................... Lateral geniculate body, pulvinar, calcarine sulcus Axial and sagittal views (MRI) .................. 19 19 19 21 22 23 24 25 26 28 29 30 31 32 The optic nerve is formed by numerous nerve fibers arising from the cells of the retina. These converge towards the optic disk, traverse the sclera and choroid, and emerge from the eyeball to form a bulky rounded cord, . the optic nerve. The optic nerve traverses the orbital cavity, enters the optic canal and ends at the optic chiasm, where the nerve fibers partially cross over to form the optic tracts.

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