nervous system
• reduced fusimotor innervation of muscle spindles
• muscle spindle innervation normal in Rectus femoris
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• peroneal muscles totally lack both motor and sensory innervation in 42% of homozygotes
• 58% with normal peroneal innervation or with innervation absent only in the superficial peroneal muscles
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• elevated apoptosis of motor neurons between 13.5 and E15.5
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muscle
• reduced in size but with normal motor innervation
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• reduced fusimotor innervation of muscle spindles
• muscle spindle innervation normal in Rectus femoris
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limbs/digits/tail
• reduced in size but with normal motor innervation
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