Archive image from page 750 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRANIUM. 733 two roots, there is a groove in which play the posterior fibres of the temporal muscle. The fossa articularis, which is between the roots, is bounded behind by the Glasserian fissure before mentioned; it forms, with the adjoining fossa parotidea, the glcnoid cavity. The zygomatic process extends forwards about an inch from its anterior root; being,therefore, convex externally and concave internally. Its upper border gives attachment to the tempora
Archive image from page 750 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRANIUM. 733 two roots, there is a groove in which play the posterior fibres of the temporal muscle. The fossa articularis, which is between the roots, is bounded behind by the Glasserian fissure before mentioned; it forms, with the adjoining fossa parotidea, the glcnoid cavity. The zygomatic process extends forwards about an inch from its anterior root; being,therefore, convex externally and concave internally. Its upper border gives attachment to the temporal fascia; its inferior (which is about half the length of the superior) to the masseter muscle. Its external surface is covered by the integu- ment, and its internal forms the outer boun- dary of the temporal fossa, in which is situ- ated the temporal muscle. The extremity of the zygomatic process forms a point, on account of the under margin being bevelled and den- ticulated to articulate with the malar bone. The circumference of the squamous process is sharp, in all that part which is above the level of the zygomatic process, and denticu- lated, at the expense of its outer table, in the rest of its extent; so that it rests on the sphe- noid bone. The connexions of this bone and the me- chanical effects which result from its position, will be readily understood. Its petrous por- tion being wedged between the basilar process of the occipital bone, which serves it as a fulcrum, and the ala major of the sphenoid, which binds it against that fulcrum ; the in- ferior part of its squamous process resting on, and being sustained by the sphenoid bone, while its mastoid process is braced in by the posterior inferior angle of the parietal, and by the occipital bone— the fronting squamous margin will effectually resist the lateral thrust of the parietal; the more so that a limited yielding movement is allowed at the fulcrum. The zygomatic process advancing forwards to the malar bone,
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