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  2. Optic chiasm - Wikipedia

    en.wikipedia.org/wiki/Optic_chiasm

    This article is about the optic chiasm of vertebrates, which is the best known nerve chiasm, but not every chiasm denotes a crossing of the body midline (e.g., in some invertebrates, see Chiasm (anatomy)). A midline crossing of nerves inside the brain is called a decussation (see Definition of types of crossings).

  3. Chiasm (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Chiasm_(anatomy)

    In mammals and birds and other vertebrates with frontal eyes, the optic nerves do blend in the optic chiasm, and only part of the nerve fibres cross the midline. [5] The drawings of Cajal suggest that the axons of the optic nerve may branch in the optic chiasm, and thus give off a branch both in the ipsi- and contralateral optic tract. [ 5 ]

  4. Commissural fiber - Wikipedia

    en.wikipedia.org/wiki/Commissural_fiber

    The anterior commissure (also known as the precommissure) is a tract that connects the two temporal lobes of the cerebral hemispheres across the midline, and placed in front of the columns of the fornix.

  5. Longitudinal callosal fascicle - Wikipedia

    en.wikipedia.org/wiki/Longitudinal_callosal_fascicle

    The inability of these axons to cross the midline results in anomalous axonal guidance and front-to-back projections within each hemisphere, rather than connecting between the hemispheres in the normal corpus callosum. These longitudinal callosal fascicles were originally described by Moriz Probst in 1901 by gross anatomical observation. [1]

  6. Decussation - Wikipedia

    en.wikipedia.org/wiki/Decussation

    Decussation is used in biological contexts to describe a crossing (due to the shape of the Roman numeral for ten, an uppercase 'X' , from Latin decem 'ten' and as 'as'). In Latin anatomical terms, the form decussatio is used, e.g. decussatio pyramidum. Similarly, the anatomical term chiasma is named after the Greek uppercase 'Χ' .

  7. Medullary pyramids (brainstem) - Wikipedia

    en.wikipedia.org/wiki/Medullary_pyramids_(brainstem)

    At the pyramids' most caudal end, the corticospinal axons decussate (or cross over) the midline and continue down the spinal cord on the contralateral side. The fibers that decussated will go down the lateral corticospinal tract while the fibers that did not decussate will travel down the anterior corticospinal tract .

  8. Dorsal column–medial lemniscus pathway - Wikipedia

    en.wikipedia.org/wiki/Dorsal_column–medial...

    Their axons cross over to the other side of the medulla and are now named as the internal arcuate fibers, that form the medial lemniscus on each side. This crossing over is known as the sensory decussation. At the medulla, the medial lemniscus is orientated perpendicular to the way the fibres travelled in their tracts in the posterior column.

  9. Axial twist theory - Wikipedia

    en.wikipedia.org/wiki/Axial_twist_theory

    The oculomotor nerve crosses the midline before leaving the central nervous system. The trochlear nerve crosses the midline in a chiasma on the dorsal side and the abducens innervates an eye muscle on the same side. [29]: Fig. 17.8 In the light of the axial twist theory, this complicated pattern can be understood.

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