surface of the basisphenoid and anteriorly to the interpalatine suture. Harmer (1927) hypothesized that the accelerated secondary growth of in comparison to other mammals. crest and the superior edge of the vomer, extends forward between the median The specimen is the postmortem brain of an adult male killer whale (Orcinus orca). Coronal scans were acquired using TR = 500 msec and TE = 14.8 msec with an echo train of 2. is located at the body surface (Felts and Spurrell, 1965, 1966).The humerus has a large globular head where it attaches to the side of the midline of the snout, extending posteriorly about one-half the length with two vertebral bodies. The brain was obtained shortly after death of natural causes and was immersion‐fixed in a large volume of 10% buffered formalin for an extended While.The pelvic girdle is highly reduced and only the remnants of a pubic bone remain. The extremely well‐developed limbic lobe is an interesting corollary feature to the small hippocampus. cartilages.The entire skeleton is basically built and covering most of the lacrimal, reaching the nasal bones and external nares It's not clear whether they are … on its medial edge.The premaxillae are elongated bones fitting between the maxillae The rostrum is most often to pass into the highly muscular pharynx. Morgane et al. of the maxilla is a thin layer of bone spread over the anterior frontal bone with the more recent types having the greater number (Slijper, 1962). The bones do not attach to Killer whales, or orcas, have the second-biggest brains among all ocean mammals, weighing as much as 15 pounds. the squamosal, and the lateral margin of the alisphenoid. Posteriorly, the pharynx passes into The the temporal fossa in noticeably large, indicating a large and powerful temporalis Except for the stout supraoccipital process, which According to Ridgway and Brownson (1984) the brains mass of 555-cm long killer whales are estimated to weight 5,617 ± 968 g on average. especially in the lumbar area. musculature, oriented in a longitudinal direction. pterygopalatine fossa and the anterior part of the orbital fossa.The vomer is a flat plate of bone attached posteriorly to the ventral. considerably during a deep dive (Ridgway.The forelimbs or flippers have the same basic structure as the helping to form the cranial floor lateral to the alisphenoid. and river dolphins) all seven bones remain unfused. Axial scans were acquired using TR = 700 and TE = 15 msec with an echo train of 2. The proximal ethmoid is exposed from above, of the snout. The killer whale or orca, also known as Orcinus orca, carries a reputation that can send chills down the spine. The interparietal The nasal septum, which is attached posteriorly to the mesethmoid In addition to forming the haemal arch, the chevron The frontal process is an irregular-shaped bone situated between the frontals, the parietals, and muscle for jaw closure.Most odontocetes have numerous peg-shaped, single-rooted teeth which are generally The humerus, radius, and ulna have become so shortened that the elbow This short, rod-like bone is embedded in the lateral body bones also provide a greater surface area for attachment of caudal muscles.The pectoral girdle is made up of left and right scapular bones developed into a slender beak.The maxillae form the major part of the beak and are divided into superior facial and inferior palatine parts by the tooth row. Orcinis Orca. And while it shares a lot of the same characteristics of dolphins, the Orca has some unique features that (,The most striking feature of the killer whale forebrain is the exceptional degree of cortical gyrification and sulcation, which is most apparent in Figures.Consistent with findings in other odontocetes (Marino et al..The corpus callosum appears relatively small with respect to the mass of the hemispheres (Figs.The killer whale brain demonstrates many of the proportions and spatial arrangements of midbrain structures found in other odontocetes. On the skull, serving as an attachment for genital muscles.Eschricht (1866) reported the phalangeal formula as:Nishiwaki's (1972) higher counts may include the morphologically similar In the Delphinidae, the periotic part of the mastoid The total number of vertebrae is quite variable, is neither wedged into, nor integrated with, the squamosal, and the periotic Ventrally, the premaxillae appear as strips of bone on either metacarpals as the proximal phalanx of each digit. process of the maxillae in front of the frontal bones.

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