Fig. 4

Prenatal development of the hyoid apparatus in horseshoe bats (CS17, CS20.5, CS22) and Mus musculus (E14.5, E16.5, E18.5), three-dimensionally reconstructed using serial tissue sections. A Rostral view of the hyolaryngeal apparatus of CS17 fetus of the horseshoe bat. B Lateral view of the hyoid components of CS17 fetus of Rhinolophus pusillus. C Rostral view of the hyolaryngeal apparatus of CS20.5 fetus of R. malayanus. D Lateral view of the hyoid components of CS20.5 fetus of R. malayanus. E Rostral view of the hyolaryngeal apparatus of CS22 fetus of R. malayanus. F Lateral view of the hyoid components of CS22 fetus of R. malayanus. G Rostral view of the hyolaryngeal apparatus of E14.5 fetus of M. musculus. H Lateral view of the hyoid components of E14.5 fetus of M. musculus. I Rostral view of the hyolaryngeal apparatus of E16.5 fetus of M. musculus. J Lateral view of the hyoid components of E16.5 fetus of M. musculus. K Rostral view of the hyolaryngeal apparatus of E18.5 fetus of M. musculus. L Lateral view of the hyoid components of E18.5 fetus of M. musculus. The tracheal chambers and tracheal rings of the horseshoe bats start those chondrifications at CS17 and CS20.5, respectively. The left side of the hyolaryngeal morphology is shown in lateral view. See text for abbreviations