146 GLOSSARY. 



SACRAL, pertaining to the sacrum. 



SACRUM, the single bone formed by the ankylosis of the vertebrae 



between the lumbar and caudal regions of the backbone to 



which the haunch-bones are attached to form the pelvis. 

 SCAPHOID, the wrist bone nearest to the radius in a line with the 



second digit. 

 SCAPULA, the bone generally known as the shoulder blade or 



shoulder-bone. 

 SCUTE, a scale or shield such as those developed for protective 



purposes among reptiles. 

 SECTORIALS, the flesh teeth, more generally known as the 



carnassials. 



SELENODONT, having the teeth with crescentic crowns. 

 SEMI -RETRACTILE, capable of being drawn back about half-way. 

 SEPTUM, a partition. 



SERRATED, having notches on the edge, as the teeth on a saw. 

 SESAMOIDS, the small bones like seeds of grain in shape which 



are found in the hand and foot. 

 SHOULDER-GIRDLE, the bones consisting of the scapula, 



clavicle, etc., by which the arm is attached to the vertebral 



column. 



SIGMOID, a curve in the shape of the letter S. 

 SINUS, a hollow space or dilation. 

 SINISTRAL, from left to right. 



SPHENOID, the wedge-shaped bone across the base of the skull. 

 SPLENIAL, the inner bone of the mandible adjacent to the den- 



tary. 

 SQUAMOSAL, the scale-like bone in contact with the basi-occipital, 



parietal and alisphenoid. 



STAPES, the innermost of the three bones of the ear. 

 STYLIFORM, slender and pointed. 

 STYLOHYALS, the bones in the tongue connecting the epihyals 



with the cranium. 

 SUPERCILIARY, pertaining to the eyebrow, the upper bony arch 



of the orbit. 



SUPRA-OCCIPITAL, the bone in the skull above the basi-occipital. 

 SUTURE, the line of junction of component bones or other adjacent 



surfaces. 

 SYMPHYSIS, the union of two bones in which there is little or no 



movement. 

 SYNOVIA, the lubricating fluid secreted by the synovial membrane 



lining the joints of the bones. 

 TALON, the heel of a tooth. 

 TARSALIA, the five bones in the second row of the ankle, known 



otherwise as the cuneiforms and cuboid. 

 TARSUS, the ankle, instep, and heel. 

 THORACIC, pertaining to the thorax. 

 THORAX, the chest, the part of the body between the neck and 



abdomen ; the portion of the skeleton enclosing it. 

 THYROHYALS, the bones in the tongue connecting the basi-hyal 



with the thyroid cartilage of the larynx. 

 TIBIA, the larger of the two bones in the lower leg, otherwise 



known as the shin-bone, 



