The American journal of anatomy . asmall dural vein. VASCULAR DRAINAGE OF ENDOLYMPHATIC SAC 73 ENDOLYMPHATIC APPENDAGE DUIIING FIRST TWO MONTHS The features with which we are chiefly concerned in the pres-ent paper do not become established until toward the end of thesecond month (embryos over 30 mm. long). A review, however,will be briefly made of the form and relations of the endolymphaticappendage prior to that time. For a more detailed description PLEXUS ANT. PLEXUSSAGITTALIS SIN. TRANSVERSUS. V. OPTHAL. SIN. CAVERNOSUS Fig. 1 Profile reconstruction showino; the topography of the membranou
The American journal of anatomy . asmall dural vein. VASCULAR DRAINAGE OF ENDOLYMPHATIC SAC 73 ENDOLYMPHATIC APPENDAGE DUIIING FIRST TWO MONTHS The features with which we are chiefly concerned in the pres-ent paper do not become established until toward the end of thesecond month (embryos over 30 mm. long). A review, however,will be briefly made of the form and relations of the endolymphaticappendage prior to that time. For a more detailed description PLEXUS ANT. PLEXUSSAGITTALIS SIN. TRANSVERSUS. V. OPTHAL. SIN. CAVERNOSUS Fig. 1 Profile reconstruction showino; the topography of the membranouslabyrinth and the endolymphatic appendage in a human embryo 24 mm. long(No. 632, Carnegie Collection). The principal head veins are shown in solidblack. Enlarged about 4 diameters. with illustrations the reader is referred to a paper previouslypublished on the development of the membranous labyrinth(Streeter 06) and to a recent paper on the dural sinuses in whichspecial attention is given to the topography of the labyrinth atits different stages (Streeter 15). THi: AMKHICAN JOURNAf. OF .ANATOMY, VOL. 19, NO. 1 74 GEORGE L. STREETER In embryos 4 mm. long the ear vesicle consists of a simpleslightly elongated spherical sac tliat lies in the space between theprimary head vein and the lateral wall of the hind-brain. At itsdorsal end can be recognized a rounded pouch-like projectionwhich is quite distinctly marked off from the rest of the is the early endolymphatic appendage. It i
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
