. The structure and classification of birds . iagram ov Crow (Corous capellanus).a, rudiments of sternal attachment of oblique septum. Other letters as in fig. 26. part of the oblique septum is largely covered with a thickishlayei: of muscular fibres, which Pilhol ^ (their describer in Beddabd, Notes on the Visceral Anatomy of Birds, II. On the Eespi-ratbry Organs in certain Diving Birds, P. 2. S. 1888, p. 252. ^ Sur la Constitution du Diaphragme desEvidyptes, Bull. Sac. Philom. (7),vi. p. 235. 42 STRUCTURE AND CLASSIFICATION OF BIRDS Eudyptes) has termed muscle diaphragmatique
. The structure and classification of birds . iagram ov Crow (Corous capellanus).a, rudiments of sternal attachment of oblique septum. Other letters as in fig. 26. part of the oblique septum is largely covered with a thickishlayei: of muscular fibres, which Pilhol ^ (their describer in Beddabd, Notes on the Visceral Anatomy of Birds, II. On the Eespi-ratbry Organs in certain Diving Birds, P. 2. S. 1888, p. 252. ^ Sur la Constitution du Diaphragme desEvidyptes, Bull. Sac. Philom. (7),vi. p. 235. 42 STRUCTURE AND CLASSIFICATION OF BIRDS Eudyptes) has termed muscle diaphragmatique muscles are, however, striated; but the duck is notthe only bird with unstriated fibres in the oblique septum,for these also occur in the toucan. In all birds, with the exception of certain passerines—possibly of the entire group of passerines—the oblique septahave the structure and relations that have been thus brieflydescribed. In passerines they have undergone what appearsto be a modification. The oblique septa of each side, instead. Fig. 28.—Visceha of Book displayed by Bemoval of Abdominal Walls. St, gizzard ; L, liver; , oblique septum. The liver is covered by a membrauecontinuous with the oblique septa. of being attached independently to the sternum, becomefused with the falciform ligament in the middle line, andform a horizontal sheet of membrane covering over the twolobes of the liver. The original (?) attachments of theoblique septa are not, however, in these birds entirely lost;a much fenestrated membrane—sometimes, indeed, reducedto a thread or two—remains to remind the anatomist of the Beddaed, On the Oblique Septa in the Passerines, and in some otherBirds, P. Z. S. 1896, p. 225. THE COELOM 43 more prevalent conditions. In the rook, however (fig. 28),they are completely preserved. But the attachment of thefalciform ligament to the sternum in the median line is cutting off of two lateral sections of the body cavityby the oblique septa, and th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
