. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 170 ANATOMY OF THE RABBIT wall, there is a shallow, horizontal groove, lodging in the natural condition the temporalis muscle of the mandible, and therefore representing a greatly reduced temporal fossa (fossa temporalis). In the natural condition, the anterior portion of the groove is converted into a foramen through the presence of a stout ligament extending from the posterior supraorbital process to the base of the zygomatic arch and through this foramen the external op
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. 170 ANATOMY OF THE RABBIT wall, there is a shallow, horizontal groove, lodging in the natural condition the temporalis muscle of the mandible, and therefore representing a greatly reduced temporal fossa (fossa temporalis). In the natural condition, the anterior portion of the groove is converted into a foramen through the presence of a stout ligament extending from the posterior supraorbital process to the base of the zygomatic arch and through this foramen the external oph- thalmic vein emerges from the orbit. The dorsal boundary of the fossa is formed by a pronounced ridge, the tem- poral line (linea temporalis), the latter forming also the lateral margin of the roof of the skull in this region. Behind the posterior root of the zygomatic arch, the external surface of the lateral wall is largely occupied by the swollen tympanic bulla (bulla tympani), formed by the tympanic bone. It contains the capacious tympanic cavity (cavum tympani) and en- closes the three small bones of the middle ear, the auditory ossicles (ossicula auditus), the relations of which are more fully dealt with below (p. 188). The dorsal portion of the tympanic bulla is con- tinuous with a short bony tube which opens at a short distance dorsally by a large oval aperture. This tube is part of a more extensive canal, the external acoustic meatus (meatus acusticus externus) which, in the natu-. FlG. frontal: Dorsal surface of the skull: F, interparietal; L, lacrimal; M, maxilla; MS, mastoid portion of petrosal (petromastoid); N, nasal; P, parietal; SO, supraoccipital (squamous portion of occipital); SQ, squamosal; ZY, zygomatic. , maxillary fossa; , temporal fossa; , superior nuchal line; , temporal line; , frontal process of premaxilla; , maxillary process of frontal; , external occipital protuberance; and , anterior and posterior
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