Skip to main content
Fig. 1 | Zoological Letters

Fig. 1

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. 1

Phylogenetic relationships among vertebrates and gross anatomy of extra-ocular muscles. a A phylogenetic tree of the vertebrates. The hagfishes lack extra-ocular muscles. b Gross anatomy of the extra-ocular muscles of the lamprey (Lethenteron camtschaticum) and shark (Scyliorhinus torazame). Asterisks indicate the optic nerve. The extra-ocular muscles are colored based on their innervation nerve: the oculomotor (III), yellow, trochlear (IV), red; abducens (IV), blue, respectively

Back to article page

Zoological Letters

ISSN: 2056-306X

Contact us