| 词汇 | pectoral-fin |
| 释义 | pectoral fin noun[ C ] biology specializeduk /ˈpek.tər.əl ˌfɪn/ us /ˈpek.tɔːr.əl ˌfɪn/ the fin on each side of a fish near the front of its body, used for controlling the direction the fish goes in and for slowing it down胸鳍（鱼身体前面两侧的鳍，用于控制和减速） Substances & structures in the body abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus myosin navicular neuroendocrine neurohormonal neurohormone tendinis tendinous tendinum tendo tensor Examples of pectoral finpectoral fin This fish has dorsal and pectoralfin spines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Pelvic fins are absent, and relatively small pectoralfin can be found near the midline, followed by the head and gill-covers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The pectoralfin disc of the deepsea skate has a moderately triangular anterior margin, a broadly rounded posterior margin, and rounded tips. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These neurons are electrically coupled with motoneurons which innervate extraocular, jaw and opercular muscles and mediate pectoralfin adduction in hatchetfish. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has a diamond-shaped pectoralfin disc wider than long, with nearly straight front margins converging to a triangular snout. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The pectoralfin is falcate, and also longer than the head. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The lateral line dips strongly after the pectoralfin, having 50 to 53 scales on the upper section and 43 to 52 keeled scutes posteriorly. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The breast of the longnose trevally is scaleless, extending up to behind the pelvic fin origin and laterally to the pectoralfin base. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has an oval pectoralfin disc with a long, flexible, broad-angled snout. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gill openings are narrow, not extending below the pectoralfin base. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The pectoralfin disc of the shagreen ray is somewhat wider than it is long. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The undulatory pectoralfin motion diagnostic to this taxon is known as rajiform locomotion. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The most prominent diagnostic feature is two dark spots at the base of the pectoralfin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The two most caudal rays of each pectoralfin are detached from the rest of the fin, and angled in a ventral direction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The head and body plates are covered with odontodes; these are larger on the ventral face of pelvic and pectoralfin spines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. See all examples of pectoral fin These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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