There are at least 3 tracts and 1 nucleus that have the name "arcuate" in them.

As for "Lemniscus," you have 2 of them.

Arcuate fasciculus: connects Broca's with Wernicke's area.

Internal Arcuate tract: connects the dorsal column nuclei with the thalamus.

Anterior/posterior External Arcuate tract: connects the dorsal column nuclei with the pons & the cerebellum.

Arcuate nucleus: I don't even know where that is

Medial Lemniscus: the continuation of the internal arcuate tract outside the medulla is named the medial lemniscus. It connects the dorsal column nuclei with the thalamus.

Lateral Lemniscus: connects the auditory nuclei (superior olivary & cochlear) with the inferior colliculi.

Pseudo-hypertrophy

It happens in muscular dystrophy.

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A history lesson & a neuroanatomy lesson

Bulbar palsy

Also, unrelated: