nervous system
• the anterior limb of the anterior commissure is defasciculated
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• 1 of 5 mutants exhibit improper development of the infrapyramidal tract
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• most axons of the anterior limb of the anterior commissure cross the midline aberrantly and axons of the infrapyramidal tract extend beyond the stratum oriens of CA3
• however, no defects in stria terminalis targeting
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• 1 of 5 mutants exhibit an infrapyramidal tract defect in which axons extend far into the stratum oriens of CA3, beyond the level at which they normally turn dorsally into the stratum radiatum
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• the anterior limb of the anterior commissure is reduced and defasciculated
• although a small number of axons of the anterior commissure decussate properly, most axons cross the midline aberrantly as smaller tightly bundled fascicles
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cellular
• the anterior limb of the anterior commissure is defasciculated
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