. The anatomical record. Anatomy; Anatomy. The Anatomical Record. • 9 The primary principle underlying the development of the jugular lymph sacs in the cat is the separation of parallel venous channels from the embryonic veins by a process of fenestration, and the subsequent conversion of these channels into the definite lymph sacs by a process of growth and fusion. In a 5-6 mm. embryo the process of fenestration is, as a rule, not yet evident (Fig. 7). Four fairly constant tributaries open into the dorso- medial surface of the precardinal (1 to 4) which are serially continuous with the segmen
. The anatomical record. Anatomy; Anatomy. The Anatomical Record. • 9 The primary principle underlying the development of the jugular lymph sacs in the cat is the separation of parallel venous channels from the embryonic veins by a process of fenestration, and the subsequent conversion of these channels into the definite lymph sacs by a process of growth and fusion. In a 5-6 mm. embryo the process of fenestration is, as a rule, not yet evident (Fig. 7). Four fairly constant tributaries open into the dorso- medial surface of the precardinal (1 to 4) which are serially continuous with the segmentally arranged tributaries which open into the dorso- medial surface of the postcardinal vein. Precardinal Duct of Cuvier. Promontory Postcardinal Primitive Ulnar Vein (Aniage) FIG. 8 In a mm. embryo the process of fenestration is usually well advanced (Fig. 8). The fenestra have formed along the dorsolateral surface of the postcardinal vein and are continuous forward with a similar series formed along the precardinal. The portion of the post- cardinal vein involved in this process of fenestration is raised into a well-defined ridge which now projects slightly forward, in the region of the duct of Cuvier, over the precardinal vein. It is from this anterior projection of the postcardinal vein, Avhich may be termed the "jugular promontory," that the anlages of the jugular lymph sacs are, for the most part, developed. The process of fenestration which extends along. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Society of Zoologists; Wistar Institute of Anatomy and Biology. [New York, etc. ] A. R. Liss [e
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1906
