. Chordate morphology. Morphology (Animals); Chordata. palatine proces; crista galli jomina orbitonasolis orbital cartilage OS carunculae opening for duct of Jacobson's organ paraseptol cartilage olfactory foramen orbitonasal fissure carotid foramen Meckel's cartilage, malleus. incus stapes fenestra ocustica endolymphatic foramen occipital condyle. processus alaris tegmen tympani fenestra vestibuli perilymphatic foramen â metotic fissure Figure 3-15. Chondrocranium of 1 22-mm embryo of Plotypus. A, lateral view; B ventral v^w of tip of Meckel's cartilage; C, dorsal view with port of ro
. Chordate morphology. Morphology (Animals); Chordata. palatine proces; crista galli jomina orbitonasolis orbital cartilage OS carunculae opening for duct of Jacobson's organ paraseptol cartilage olfactory foramen orbitonasal fissure carotid foramen Meckel's cartilage, malleus. incus stapes fenestra ocustica endolymphatic foramen occipital condyle. processus alaris tegmen tympani fenestra vestibuli perilymphatic foramen â metotic fissure Figure 3-15. Chondrocranium of 1 22-mm embryo of Plotypus. A, lateral view; B ventral v^w of tip of Meckel's cartilage; C, dorsal view with port of roof removed; D, ventral v,ew with most of Meckel's cartilage removed. (Modified from DeBeer, 1937) in the occipital arch; instead this foramen is confluent with the jugular foramen, into which also opens the fenestra perilymphaticus. The paroccipital process has a small tegmen tympani and forms a lateral margin to the tympanic fossa. The hyoid attaches to this margin lateral to the fenestra vestibuli. There is a broad orbitoparietal commissure, and from the orbital plate there is a posteroventral antotic pillar and a ventral preoptic pillar. The pila antotica attaches at the sides of the dorsum sellae. The broad preoptic pillar attaches to the trabecular stem behind a slight interorbital septum lead- ing up and forward to a knob-like crista galli. To either side below the crista galli is a large, round olfactory foramen; a cribriform plate is not formed. The nasal capsule is solid above and laterally, except for a small foramen epiphaniale at the end of the sphenethmoid commissure of the orbital plate, and a nasolacrimal foramen on the same vertical but near the ventral margin of the lateral wall of the capsule. The hind wall of the capsule, the lamina orbitonasalis, is fused with the midline plate and lacks any flooring. Ante- riorly there are paired fenestrae narinae separated by a thin and fenestrated septum. The margins of these fenestrae show dorsal and ventral processes t
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