Template talk:Anson1934 figures

From Embryology
  • 9 - 2.4-mm. embryo, H.E.C., 40. The cavity of the auditory pit is still in communication with the exterior through the hollow placodal stalk. See section 28, figure 1.
  • 10 - 4 mm., 2302. The auditory vesicle has lengthened; the stalk of communi- cation between the epidermis and the vesicle, although still persistent, no longer contains a lumen. See section 12, figure 4.
  • 11 - 6.3 mm., 2300. The initial indication of the constriction which is destined to separate the endolymphatic appendage from the vestibular portion of the vesicle is now apparent. The epidermis overlying the endolymphatic appendage is still thickened, but no remnant of the original placodal stalk of continuity remains. See section 67, figure 5.
  • 12 - The same model, viewed from behind. The arrow points to the constricting crease between the developing endolymphatic appendage and the more pro- tuberant vestibule.
  • 13 - 6.7 mm., 2285 (viewed from the front). The arrow indicates the deepen- ing crease which limits the endolymphatic appendage and marks the site of the future ‘valve.’
  • 14 - The same model (viewed from the side). The endolymphatic appendage at this stage is readily distinguishable from the vestibular part of the auditory vesicle. The epidermis and the appendage carry tubercles which represent parts of the now discontjnuous placodal stalk (see section 71,fig. 6).