| internal surface of frontal bone | The surface of the frontal bone that contributes to the wall of the cranial cavity. Synonym: facies interna ossis frontalis. (05 Mar 2000) |
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| internal surface of parietal bone | The concave surface of the parietal bone forming part of the wall of the cranial cavity. Synonym: facies interna ossis parietalis. (05 Mar 2000) |
| interparietal bone | The upper part of the squama of the occipital bone, developed in membrane instead of in cartilage as is the rest of the occipital, and occasionally (especially in ancient Peruvian skulls) existing as a separate bone, separated from the remainder of the occipital by the sutura mendosa. Synonym: incarial bone, interparietal bone, os incae. (05 Mar 2000) |
| irregular bone | One of a group of bones having peculiar or complex forms, e.g., vertebrae, many of the skull bones. Synonym: os irregulare. (05 Mar 2000) |
| ischial bone | 1. <anatomy> The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone. 2. <zoology> One of the pleurae of insects. Origin: L, Gr. Source: Websters Dictionary (01 Mar 1998) |
| occipital angle of parietal bone | The posterior superior angle of the parietal bone. Synonym: Broca's angles. Synonym: Daubenton's angle. (05 Mar 2000) |
| occipital bone | The bone forming the rear (and rear bottom) of the skull. (12 Dec 1998) |
| occipital border of parietal bone | The posterior margin of the parietal bone that articulates with the occipital squama. Synonym: margo occipitalis ossis parietalis. (05 Mar 2000) |
| occipital border of temporal bone | That part of the temporal bone that articulates with the occipital squama. Synonym: margo occipitalis ossis temporalis. (05 Mar 2000) |
| orbicular bone | A knob at the tip of the long limb of the incus which articulates with the stapes. Synonym: processus lenticularis incudis, lenticular apophysis, lenticular bone, orbicular bone, orbicular process, orbiculare, os orbiculare, os sylvii. (05 Mar 2000) |
| orbital eminence of zygomatic bone | A small elevation on the orbital surface of the zygomatic bone, just within the orbital margin, about 1 cm below the zygomaticofrontal suture; it gives attachment to the lateral check ligament, the lateral palpebral ligament, and the suspensory ligament of the eyeball. Synonym: eminentia orbitalis ossis zygomatici, orbital eminence of zygomatic bone, Whitnall's tubercle. (05 Mar 2000) |
| orbital lamina of ethmoid bone | A thin plate of ethmoid bone forming part of the medial wall of the orbit and the lateral wall for the ethmoidal labyrinth. Synonym: lamina orbitalis ossis ethmoidalis, lamina papyracea, orbital lamina of ethmoid bone, orbital layer of ethmoid bone, orbital plate, paper plate, papyraceous plate. (05 Mar 2000) |
| orbital layer of ethmoid bone | A thin plate of ethmoid bone forming part of the medial wall of the orbit and the lateral wall for the ethmoidal labyrinth. Synonym: lamina orbitalis ossis ethmoidalis, lamina papyracea, orbital lamina of ethmoid bone, orbital layer of ethmoid bone, orbital plate, paper plate, papyraceous plate. (05 Mar 2000) |
| orbital part of frontal bone | The portion of the frontal bone that contributes to the formation of the orbits; the most rostral of three cortical convolutions that togetther form the inferior frontal gyrus. Synonym: pars orbitalis ossis frontalis. (05 Mar 2000) |
| orbital plate of ethmoid bone | A thin plate of ethmoid bone forming part of the medial wall of the orbit and the lateral wall for the ethmoidal labyrinth. Synonym: lamina orbitalis ossis ethmoidalis, lamina papyracea, orbital lamina of ethmoid bone, orbital layer of ethmoid bone, orbital plate, paper plate, papyraceous plate. (05 Mar 2000) |