. Chordate morphology. Morphology (Animals); Chordata. supraorbitals supraorbital canal, nasal medial rostral. premaxilla lateral rostrals lacrimal maxilla nfraorbital canal Figure 5-4. Anterolateral and somewhat dorsal view of snout skeleton of £/ops sourus showing "supraorbitals" and "; (After Nybelin, 1957) nasal capsule trabecule communis otic capsule parachordal cartilage notochord trabecule communis orbital cartilage Meckel's cartilage orbital cartilage palatine branch VII facial foramen which separates the myodome into bilateral chambers, and by the attachme
. Chordate morphology. Morphology (Animals); Chordata. supraorbitals supraorbital canal, nasal medial rostral. premaxilla lateral rostrals lacrimal maxilla nfraorbital canal Figure 5-4. Anterolateral and somewhat dorsal view of snout skeleton of £/ops sourus showing "supraorbitals" and "; (After Nybelin, 1957) nasal capsule trabecule communis otic capsule parachordal cartilage notochord trabecule communis orbital cartilage Meckel's cartilage orbital cartilage palatine branch VII facial foramen which separates the myodome into bilateral chambers, and by the attachment of this medial bone to the diverging anterior ends of the prootic. A prefacial commissure forms between the facial and trigeminal foramina, which in turn is separated from the optic fenestra by an antotic pillar. The notochord is obliterated by constriction. The development of the bony cranium begins very early, less than 10 mm in length. Teeth appear first and then the jaw and palate bones to which they attach. Many of the bones of the head skeleton arise either in association with the organs of the sensory canals or with teeth, and it has been assumed that the stimulus for bone formation resided in those structures (Fi^gure 5-8). Observations indicate that some bones arise in relation to canal organs and become tubes enclosing the canals. Other bones arise in a like manner but deeper basal plates develop and spread out away from the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jollie, Malcolm. New York, Reinhold
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