As a rule the meatus is the narrowest part of the whole canal.
(external meatus) a vertical slit.
1, Per), in these genera and the hares the meatus auditorius being tubular and directed upwards and backwards.
The air-bladder may be so reduced as to lose its hydrostatic function and become subservient to a sensory organ, its outer exposed surface being connected with the skin by a meatus between the bands of muscle, and conveying the thermobarometrical impressions to the auditory nerves.
Comenius we find the following definition: - "Astronomus siderum meatus seu motus considerat: Astrologus eorundem efficaciam, influxum, et effectum."
The squamosal enters considerably into the formation of the temporal fossa, and, besides sending the zygomatic process forwards, it sends down behind the meatus auditorius a post-tympanic process which aids to hold in place the otherwise loose tympano-periotic bone.
The tympanic forms a tubular meatus auditorius externus directed outwards and slightly backwards.