. Cunningham's Text-book of anatomy. Anatomy. SoM SpMi ' / First cephalic aortic arch SpM2 Fig. 67.—Transverse Section of a Eat Embryo. Showing the relation of the paraxial mesoderm of the head to the lateral plates, the commencement of the formation of the otic vesicles and hyomandibular clefts, and the relation of the primitive heart to the pericardium and fore-gut. EC. Ectoderm. SoM. Somatic mesoderm. SpM. Splanchnic mesoderm. transformed into a pear-shaped vesicle, the otic vesicle, which remains for a time in communication with the ex- HB terior by means of a short tubular stalk, the rece
. Cunningham's Text-book of anatomy. Anatomy. SoM SpMi ' / First cephalic aortic arch SpM2 Fig. 67.—Transverse Section of a Eat Embryo. Showing the relation of the paraxial mesoderm of the head to the lateral plates, the commencement of the formation of the otic vesicles and hyomandibular clefts, and the relation of the primitive heart to the pericardium and fore-gut. EC. Ectoderm. SoM. Somatic mesoderm. SpM. Splanchnic mesoderm. transformed into a pear-shaped vesicle, the otic vesicle, which remains for a time in communication with the ex- HB terior by means of a short tubular stalk, the recessus labyrinthi, which is subse- quently converted into the ductus endolymphaticus. After it is separated from the surface the otic vesicle alters its position until its ventral end lies in close re- lation to the dorsal wall of the pharynx, and, at the same time, it undergoes alteration of shape. The ventral part of the vesicle grows towards the median plane, along the ventral wall of the hind-brain. It forms the cavity and the lining epithelium of the coch- lea; but it remains in con- nexion with the dorsal part by means of a narrow tube, the canalis reuniens, and as it ^rows in length it becomes converted into a spiral tube. The portion of the dorsal section of the primitive vesicle, which lies to the lateral side of the ductus endolymphaticus, first expands and then becomes compressed and 4a. -Transverse Section through the Head of an Embryo. Showing the rudiments of the three parts of the car and their relation to the hyomandibular cleft. BY. Blood-vessels. X. Notoehord. C. Cochlea. ov. Otic vesicle. EM. Ext. acoustic meatus. p. Pharynx. ET. Auditory tube. RL. Recessus labyrinthi HB. Hind-brain. Semicircular canal. HM Hyomandibular cleft. T. 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 C
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
