| os occipitale | The bone forming the rear (and rear bottom) of the skull. (12 Dec 1998) |
|---|---|
| os odontoideum | The dens of the axis when anomalously not fused with the body of the axis. (05 Mar 2000) |
| os orbiculare | 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) |
| os palatinum | Synonym: palatine bone. (05 Mar 2000) |
| os parietale | The side bone of the skull. (12 Dec 1998) |
| os penis | A bone of variable size and shape, located in the glans penis or glans clitoridis of all animals, except man, ungulates, elephants, whales, and a few others; it is particularly well developed in carnivora, and in the dog may reach a length of more than 10 cm; its size and shape are often a characteristic of a species. Synonym: baculum, penis bone. (05 Mar 2000) |
| os pisiforme | A small bone resembling a pea in size and shape, in the proximal row of the carpus, lying on the anterior surface of the triquetral with which alone it articulates; it gives insertion to the tendon of the flexor carpi ulnaris muscle. Synonym: os pisiforme, lentiform bone. (05 Mar 2000) |
| os planum | A type of bone characterised by its thin, flattened shape, such as the scapula or certain of the cranial bones. Synonym: os planum. (05 Mar 2000) |
| os pneumaticum | A bone that is hollow or contains many air cells, such as the mastoid process of the temporal bone. Synonym: os pneumaticum, hollow bone. (05 Mar 2000) |
| os premaxillare | The anterior and inner portion of the maxilla, which in the foetus and sometimes in the adult is a separate bone; the incisive suture runs from the incisive canal between the lateral incisor and the canine tooth; according to K. Albrecht, the os incisivum is further divided by a suture between the two incisor teeth on each side into two bones, the endognathion and the mesognathion. Synonym: incisive bone, intermaxilla, intermaxillary bone, os intermaxillare, os premaxillare, premaxilla, premaxillary bone. (05 Mar 2000) |
| os pterygoideum | A long process extending downward from the junction of the body and great wing of the sphenoid bone on either side; it is formed of two plates (lateral and medial), united anteriorly but separated below to form the pterygoid notch; the pterygoid fossa is formed by the divergence of these two plates posteriorly. Synonym: processus pterygoideus, os pterygoideum. (05 Mar 2000) |
| os pubis | The prominence caused by a pad of fatty tissue over the symphysis pubis in the female. Synonym: os pubis, mons veneris, pubes, pubic bone. (05 Mar 2000) |
| os pyramidale | A bone on the medial (ulnar) side of the proximal row of the carpus, articulating with the lunate, pisiform, and hamate. Synonym: os triquetrum, cubital bone, os pyramidale, os triangulare, pyramidal bone, pyramidale, three-cornered bone, triquetrum. (05 Mar 2000) |
| os sacrum | <anatomy> The triangular-shaped bone lying between the 5th lumbar vertebra and the coccyx (tailbone). It consists of 5 vertebrae fused together and it articulates on each side with the bones of the pelvis (ilium), forming the sacroiliac joints. (17 Dec 1997) |
| os scaphoideum | The largest bone of the proximal row of the carpus on the lateral (radial) side, articulating with the radius, lunate, capitate, trapezium, and trapezoid. Synonym: os scaphoideum, navicular bone of hand, os naviculare manus. (05 Mar 2000) |