The caudal portion of the fourth
occipital somite fuses with the cranial portion of the first cervical somite to form the proatlas.
Musculature of tongue, innervated by the Hypoglossal Nerve (CN XII), except for the palatoglossus (which is supplied by the Vagus nerve) is formed by the
Occipital somites.
At 7 weeks of gestation, the intrinsic musculature of the tongue is formed by the first four
occipital somites, which are innervated by the hypoglossal nerve.