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Figure 1 | Zoological Letters

Figure 1

From: On the peculiar morphology and development of the hypoglossal, glossopharyngeal and vagus nerves and hypobranchial muscles in the hagfish

Figure 1

Anatomical configuration of the putative “neck” region of the hagfish. (A) Left lateral view of an adult hagfish, Myxine garmani, originally drawn by Nishi (1938). (B) A schematized illustration showing the innervating pattern of a spinal nerve in a transverse section of a hagfish, Bdellostoma dombeyi. Redrawn from [22]. The arrow indicates the ventral branch that extends ventrally to innervate the oblique and rectus muscles. (C) Dorsal view of the oblique and rectus muscles together with the skin (sk) in M. glutinosa. (D) Dorsal view of a dissected head of M. glutinosa showing the morphological patterns of the nervous system (yellow). Note that the spinal nerves (sp1–3) are located dorsolateral to the branchiomeric nerve components: the glossopharyngeal (IX) and vagus (X) nerves. Light blue indicates cranial cartilage. (C) and (D) are redrawn from [15].

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