We thank Dr. J.T. All species of dissected Mesoplodon are unique in displaying two triceps heads that take origin from the humerus (caput laterale and caput mediale), retaining the primitive artiodactyl condition. In contrast to the robust muscles found in all other mysticetes, antebrachial muscles of the humpback whale (Megaptera novaeangliae) displayed drastically reduced origins and insertions. We are pleased to provide you with the picture named Beluga whale anatomy.We hope this picture Beluga whale anatomy can help you study and research.
Similar muscles were not identified in other dissected cetaceans, but the m. interosseus was previously reported in Kogia (Schulte and Smith; 1918). A: Fin whale (Balaenoptera physalus). In the pygmy hippopotamus, only the caput mediale arising from the humeral shaft is functional as both the scapular (caput longum) and humerus (laterale) heads are tendinous, and the caput accessorium is absent (Fisher et al., 2007). Unfortunately, few bony landmarks are preserved in fossil mysticete and odontocete forelimbs, and data indicating the transition in muscle morphology between archaeocetes and extant cetaceans are lacking.
However, our data indicate that taxonomic distribution, not body size, was the best predictor of antebrachial muscle morphology. It has a tapered body plan that allows for easy swimming through the water, baleen teeth which is where this class of whales it's name and of course the double blow hole directly connected to the lungs of theses graceful giants. The shoulder joint retains the standard ability for circumduction, the cubital joint moves during each paddle (Fish, 2004), and the wrist retains some mobility (Dart, 1974).
Extensor muscle contraction may act to stiffen the flipper, but no evidence suggests the ability to extend the digits. In Physeter, a scapular head (caput longum) of the triceps sent a tendinous band distally to the olecranon to fuse with the tendo flexor carpi ulnaris (Fig. Killer Whale physical characteristics . Identification of the m. interosseus muscle group in Physeter was based on its location, attachments, and relationship to the digital flexor tendon in each digit.
Behavioral data and dissection results suggest that cetacean forelimb sensory innervation retains the basic mammalian pattern of distribution. Extensor tendons adhere more closely to the underlying connective tissues, and lack such distinct synovial structures. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. The presence of antebrachial muscles was documented in fossil archaeocetes Ambulocetus natans (Thewissen et al., 1996; Madar et al., 2002) and Dorudon atrox (Uhen, 2004) based on bony landmarks of several forelimb elements. Forelimbs shown in dorsal views (top row) and palmar views (bottom row). Data were gathered during dissections of 22 flippers, representing 15 species (7 odontocetes, 15 mysticetes). Degree of antebrachial muscular development appears to be best predicted by taxonomic distribution, and does not correlate with body size. Cetacean body structure is similar to most other mammals with tails, except for the missing hind limbs. The reduced musculature of these taxa decreased flipper thickness, created a greater aspect ratio (the ratio of proximodistal length to craniocaudal width), which would allow in turn allow more efficient generation of lift.
Brownell to L.N.C., the San Diego State University Biology Department Student Travel Grant to L.N.C, a NOAA Prescott Stranding Grant to J.S.R., and an NSF grant to A.B. Zoologische Jahrbucher, Radiographic anatomy and development of the cetacean flipper, Feeding behavior of free‐ranging walruses with notes on apparent dextrality of flipper use, Functional anatomy of the penguin flipper, The functional anatomy and general biology of, Paleontology of the late Oligocene Ashley and Chandler bridge formations of South Carolina, 3: Eomysticetidae, a new family of primitive Mysticetes (Mammalia: Cetacea), The external characters, skeletal muscles, and peripheral nerves of.
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