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Comparative Anatomy
Alligator Axial and Skull Skeleton
| Question | Answer |
|---|---|
| Neural Spine | A dorsal projection of the vertebrae |
| Neural Arch | The dorsal part of the vertebrae, forming the roof of the centrum |
| Centrum | The opening for the spinal cord |
| Ribs | Lateral projections from the thoracic vertebrae |
| Hemal Arch | The ventral part of the vertebrae, forming the floor of the centrum |
| Cervical Vertebrae | Vertebrae extending from the head to the pectoral girdle |
| Thoracic Vertebrae | Vertebrae extending and forming the pectoral girdle to the lumbar vertebrae, which do not have ribs |
| Lumbar Vertebrae | Vertebrae extending from the thoracic vertebrae (with ribs) to the pelvic girdle |
| Sacral Vertebrae | Vertebrae forming the pelvic girdle |
| Caudal Vertebrae | Vertebrae extending from the pelvic girdle to the tip of the tail |
| Premaxilla | Anterior most bone of the skull, hosting the nares |
| Frontal | Bone between the orbitals |
| Prefrontal | Anterior to the orbitals and frontal, on either side of the nasal bones |
| Parietal | Posterior most dorsal bone of the skull |
| Quadrate | Bone on the posterior wall of the skull, below the parietal bone, attached to the quadratojugal |
| Quadratojugal | Small bone connecting the quadrate to the jugal bone |
| Jugal | Lateral bone forming the lateral side of the infratemporal fenestra and the orbital |
| Nasal | Bone extending from the external nares in the premaxilla to the orbitals and frontal bone |
| Maxilla | Lateral bone on either side of the nasal bones, posterior to the premaxilla |
| External Nares | Anterior opening on the dorsal side of the skull in the premaxilla |
| Internal Nares | Posterior opening on the ventral side of the skull in the palatine bone |
| Incisive Foramen | Ventral opening below external nares anterior on the skull in the palatine process of the premaxilla |
| Posterior Palatine Vacuities | Openings in the ventral side of the skull, below the orbitals |
| Pterygoid | Ventral process on the lateral side of the skull that articulates with the lower jaw |
| External Auditory Meatus | Canal on the lateral side of the skull in the posterior position |
| Supraoccipital | Dorsal, medial bone on the posterior wall of the skull |
| Exoccipital | Ventral and lateral to the supraoccipital, surrounding it and forming the dorsal side of the foramen magnum |
| Basioccipital | On the posterior wall below the Occipital Condyle, below the foramen magnum |
| Occipital Condyle | Articulation on the posterior wall between the vertebrae and the skull |
| Foramen Magnum | Large opening in the posterior wall of the skull where the spinal cord enters |
| Articular | Articulation, posterior, between the lower jaw and the pterygoid of the skull |
| Angular | Bone anterior to the articular that hosts the external mandibular fenestra |
| Dentary | Anterior most bone of the lower jaw |
| Coronoid | Small bone on the medial side of the lower jaw helping form the external mandibular fenestra |
| Splenial | Bone on the medial side of the lower jaw, medial to the dentary |
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LionsandGiants
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