. The development of the chick; an introduction to embryology . )ars infeiioi-; it lies in front of the lower end of theeiidolym])hatic duct at a slightly lower level and is separated bytwo depressions above and below, fi-om the anterior ampullaand the ductus cochleaiis respectively. The fui-rows above thesacculus and below the ampulla of the frontal semicircular canalnuirk the boundary l^etween the pars superior and Fig. 172. — Model of the aiulilory labyrinth of tlieright side of a chick embryo of 8 days and 17hours; external view. (After Rothifiand Bruf^scli.) Ampulla of the
. The development of the chick; an introduction to embryology . )ars infeiioi-; it lies in front of the lower end of theeiidolym])hatic duct at a slightly lower level and is separated bytwo depressions above and below, fi-om the anterior ampullaand the ductus cochleaiis respectively. The fui-rows above thesacculus and below the ampulla of the frontal semicircular canalnuirk the boundary l^etween the pars superior and Fig. 172. — Model of the aiulilory labyrinth of tlieright side of a chick embryo of 8 days and 17hours; external view. (After Rothifiand Bruf^scli.) Ampulla of the anterior semicircular 1., Ampulla of the lateral scMuicircular canal. , Ami)ulla of the posterior semicircular canal. , .terior semicircular canal. C. 1., Lateral .semi-circular canal. C. p., Posterior semicircular e., Endolymphatic sac. U., Itriculus. Otherabbreviations as before. A i\:\y later (Iig. 17lM. these furrows have cut in deei)er andha\e liecome coiUiiuious on the nuMlian sui-face; the lageiui hasenlarge(l distally, and the sacculus is a hemispherical protuber-ance, bhe ti[) of th(. lagena lies beneath the hind-l)rain (Fig. orc;ans of special sense 295 168). The condition shown in Fij:;. 173, at eleven days seven-teen hours is substantially the same as in the adult. {(I) Development of the Auditory Nerve and Sensory Areas of theLabyrinth. During the changes in the form of the l
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