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Fig. 5 | Zoological Letters

Fig. 5

From: Comparative morphology and development of extra-ocular muscles in the lamprey and gnathostomes reveal the ancestral state and developmental patterns of the vertebrate head

Fig. 5

Histological analysis by hematoxylin-eosin (HE) staining of the extraocular muscles in larval, metamorphic and adult lampreys. a Small larva (3.5 cm, about half a year old). b Large larva (10 cm). c Metamorphic lamprey. d Adult lamprey a1–d1: External sections; a2–d2: External sections, colored; a3–d3: Medial sections; a4–d4: Medial sections, colored

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