1978
DOI: 10.1002/aja.1001520310
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Myology of the shoulder of Pontoporia blainvillei, including a review of the literature on shoulder morphology in the cetacea

Abstract: The purpose of this paper is to describe in detail the shoulder myology of the La Plata River Dolphin, Pontoporia blainvillei, and to review the literature on cetacean shoulder myology. Three fetal and one adult animal were used for the collection of morphological information. Pontoporia is less specialized in its shoulder anatomy that most delphinid cetaceans, and shares several characteristics with some mysticetes. The omohyoid and anterior serratus anterior muscles are found in both Pontoporia and the mysti… Show more

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Cited by 29 publications
(25 citation statements)
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“…This process is the basis of dermatome and myotome maps (Landmesser, 2001; Wang and Scott, 2002). Mammalian forelimbs are usually innervated by neurons from cervical segment 5 (C5) through the first thoracic segment (T1), but there is interspecies variability: rat forelimb innervation extends from C4–T2, whereas dolphin fins are innervated from levels C4–8 (Strickler, 1978; Takahashi et al, 2003). This somatotopic organization, in which adjacent anatomical areas are represented near each other, is set up in the periphery and preserved through multiple relays in the central nervous system (Florence et al, 1989; Kandel et al, 2012; Xu and Wall, 1999).…”
Section: Introductionmentioning
confidence: 99%
“…This process is the basis of dermatome and myotome maps (Landmesser, 2001; Wang and Scott, 2002). Mammalian forelimbs are usually innervated by neurons from cervical segment 5 (C5) through the first thoracic segment (T1), but there is interspecies variability: rat forelimb innervation extends from C4–T2, whereas dolphin fins are innervated from levels C4–8 (Strickler, 1978; Takahashi et al, 2003). This somatotopic organization, in which adjacent anatomical areas are represented near each other, is set up in the periphery and preserved through multiple relays in the central nervous system (Florence et al, 1989; Kandel et al, 2012; Xu and Wall, 1999).…”
Section: Introductionmentioning
confidence: 99%
“…This is not the case in odontocetes as the 'fish, squid and occasional invertebrate' characterization fits both the small-and largebrained dolphins. Pontoporia is an especially interesting case because, unlike the slower swimming river dolphins, they live in the marine habitat and have a scapular morphology indicating that they are stronger, more manoeuvrable swimmers than the small-brained riverine species (Strickler 1978). An extensive recent study of diet in this species could have been taken from the delphinid playbook, revealing Pontoporia to be an opportunistic feeder eating a variety of schooling and solitary fish and squid (Bassoi 2005).…”
Section: Paying the Costs (A) Brains Food And Metabolic Rates In Dolmentioning
confidence: 99%
“…The myology of the odontocete forelimb has also been previously studied (Howell 1930 a ; Pilleri et al 1976; Smith et al . 1976; Strickler 1978, 1980; Cooper et al . 2007 b ).…”
mentioning
confidence: 99%
“…The shoulder girdle of physeterids and ziphiids possess a subscapularis muscle that is divided into different fiber columns separated by tendinous sheaths (Cooper 2004). Compared to delphinoids (monodontids, phocoenids, and delphinids), the shoulder of the La Plata river dolphin, Pontoporia blainvillei , exhibits a greater degree of muscle differentiation (specialization of muscular structures and diversity of muscular fiber architecture), and an increase in volume (Strickler 1978). The deltoid muscle in Monodon monoceros is characterized by being very large and showing a strong aponeurosis at the origin and a thin division overlying the main muscle mass separable only along its cranial border (Howell 1930 a ).…”
mentioning
confidence: 99%