BONE 



132 



BONE 



teriorly with the mesethmoid bone and the vomer, and 

 posteriorly with the basisphenoid bone ; it is represent- 

 ed in man by that part of the body of the sphenoid 

 lying in front of the lesser sphenoid and the olivary 

 eminence. Syn., Basiheloides. B., Primitive Key. 

 See B. , Precotacoid. B.s, Primordial. See Car- 

 tilage Bones (Illus. Diet.). B., Prootic, in compara- 

 tive anatomy one forming the anteroventral part of the 

 auditory capsule and corresponding to the upper part 

 of the petrosa, a part of the mastoid process of the 

 temporal bone, and the greater part of the labyrinth in 

 man. B., Propellor. See B., Innominate (Illus. 

 Diet.). B., Pterotic, in comparative anatomy a small 

 inconstant bone situated between the prootic and epi- 

 otic bones on the upper and external side of the auditory 

 capsule. B., Pterygoid, in comparative anatomy a 

 bone running from the palatine to the quadrate regions 

 and in man represented by the internal pterygoid plate 

 of the sphenoid. B., Puboischiadic, B., Pubois- 

 chiatic, the os pubis and the ischium taken as one. 

 B., Pyramidal. See B., Cuneiform (Illus. Diet.). 

 B., Quadrate. See Quadrate (2) (Illus. Diet.). B., 

 Quadratojugal, in comparative anatomy a bone run- 

 ning backward from the malar bone to the quadrate. 

 It is represented in man by the zygomatic process of 

 the temporal bone. B., Raven. See B., Coracoid. 

 B.s, Rickety, those of rachitic subjects, deficient in 

 earthy matter. B., Rider's. See B., Cavalry. B.s, 

 Roof, membrane bones. B., Rooting-. See B., 

 Prenasal. B., Rudimentary Metacarpal, in veteri- 

 nary anatomy two small bones shaped like an inverted 

 pyramid on the inner and outer sides of the posterior 

 surface of the chief metacarpal bone ; they are the rudi- 

 ments of the metacarpal bones of man. Syn., Splint 

 bones. B., Rump. I. The coccyx. 2. The sacrum. 

 B., Scaphocuboid, a bone formed by the union of the 

 scaphoid and cuboid bones. B., Scapholunar, a 

 bone formed by the union of the scaphoid and semilu- 

 nar bones. B.s, Scleral. See B.s, Dermal. B., 

 Sclerogenous. See Membrane-bone (Illus. Diet.). 

 B.s, Sclerosteous. See B.s, Sesamoid (Illus. Diet.). 

 B., Sclerotal, B., Sclerotic, in some of the lower 

 vertebrates the bony plates found in the sclera of the 

 eye. B., Scooping. See B., Prenasal. B., Seat. 

 See Ischium (Illus. Diet.). B.s, Secondary. See 

 Membrane-bone (Illus. Diet.). B. -segment, a 

 sclerotoma. B., Septal, in some vertebrates the ossi- 

 fication occurring in the ventricular septum of the heart. 

 B., Septomaxillary, in many of the lower vertebrates 

 a bony plate or nodule attached to the side of the nasal 

 septum near its anterior end. B., Sesamoid, Small, 

 the navicular bone of the horse. B., Share. 1. The 

 ilium. 2. The os pubis. B. -shave, femoropopliteal 

 neuralgia. B., Shin, the tibia. B.s, Short, those in 

 which the length does not exceed the breadth in a 

 marked degree. B.s, Skin. See B.s, Dermal. B., 

 Sieve-like, the ethmoid bone. B., Sling, the astrag- 

 alus. B., Sphenoid, Posterior. See B., Bast- 

 sphenoid. B., Sphenotic. See B., Postfrontal. B., 

 Splanchnic, those developed within the visceral tis- 

 sues. B., Splenial. 1. In comparative anatomy one 

 found on the inner surface of the mandible between 

 the angular and dentary bones. B.s, Splint. See 

 B.s, Metacarpal, Rudimentary. B., Splinter, the 

 fibula. B., Spoke, the radius. B.s, Spongy. See 

 B.S, Cancellous; and B.S, Turbinate (Illus. Diet.). 

 B., Spongy, Inferior, the inferior turbinate bone. B., 

 Squamomastoid, one formed by the junction of the 

 squamous and mastoid bones. B., Squamosal, B., 

 Squamous, in Comparative anatomy a scale-like bone 

 situated above and anterior to the auditory capsule 

 representing the squamous part of the temporal bone 



and the zygomatic process in man. B., Squamoso 

 parietal, one formed by the junction of the squamou 

 and parietal bones. B., Squamosotympanic, on 

 formed by the union of the squamosal and tympani 

 bones. B., Square. See Quadrate (2) (Illus. l)ict. 

 B., Stirrup. See Stapes (Illus. Diet.). B., Stylo 

 hyal, in comparative anatomy a slender bone connet 

 ing the hyoid apparatus with the skull and represente 

 in man by the styloid process of the temporal bom 

 B.s, Subcaudal. See B.s, Chevron. B.s, Subdeil 

 mal, membrane bones. B., Subjugal. See B\ 

 Supraangular. B., Suboccipital. See B 

 occipital. B., Suborbital, in comparative anaton 

 the largest of the bones composing the infraorbital in. ; 

 represented in man by the lacrimal hone. B. 

 Superadded. See Membrane-bone (Illus. Diet.; 

 B., Supercarpal, the pisiform bone of the horse. E 

 Superficial Ethmoid. See B. , Prefrontal. E 

 Supermaxillary, the superior maxilla. B.s, Supej 

 numerary, such as arise from independent osteoblas 

 centers and fail to fuse with contiguous masses in 1 1 

 normal way, as the parietal bones at the lambda. I 

 Superorbital. See B., Supraorbital. B., Supr 

 angular, in lower vertebrates a bone lying on the 011 

 side and dorsal margin of the mandible. B., Supr 

 clavicular, in some of the lower vertebrates a slenc 

 bone articulating with the coracoid bone and with t 

 suprascapular. B., Supraethmoid, in compar.U 

 anatomy a bone sometimes overlying the upper part 

 the nasal capsule. B., Supraoccipital, B., Suroo 

 pital, the squamous part of the occipital bone. 

 Supraorbital, in some of the vertebrates a 1 

 ing the rim of the orbit. B.s, Supraorbital, one' 

 two rows of bones composing the rim of the orbit. 

 Suprascapular, B., Surscapular, a bone connect! 

 the scapular arch with the skull. B.s, Suprasterr j 

 See Cartilages, Brecht's. B., Supratemporal, i 

 comparative anatomy a bone situated above a 

 rior to the squamosal bone and with which itj> 

 sometimes confluent. B.s, Sutural, the worn I 

 bones of the skull. B.s, Symmetric, ti 

 the sternum, which are divided equally by the 

 dian plane of the body. B., Symplectal, 1, 

 Symplectic, in comparative anatomy a small t 

 articulating with the lower border of the hymn 

 bone and with the inner face of the quadn 

 B., Syzygy. See B., Furcular. B.s, Tabu 

 those having flat tabular surfaces. B., Tail, the 

 cyx. B., Tegumentary. See Mcmbran 

 (Illus. Diet.). B., Temple, the temporal boi 

 Thyrohyal, the greater cornua of the hyi 

 They persist as distinct bones throughout thi 

 many of the lower vertebrates. B., Tongue. V 

 B., Hyoid; and B., Urohyal. B., Tricus: 

 sixth cervical vertebra. B.s, Tubular, the 1. 

 B., Turbinal, the inferior turbinate bone. B., If" 

 binated, Anterior. See />'., 'Pur; 

 (Illus. Diet.). B., Turbinated, Posterior. 

 Turbinate, Inferior (Illus. Diet.). B., Tyn 

 hyal, in lower vertebrates a bone connecting the s 

 hyal bone with the posterior margin of the 

 bone. B., Tympanomalleal. 1. The - 

 bone. [Agassiz.] 2. The quadratojugal 1 

 [Duges.] B., Tympanoperiotic, a bone I 

 the junction of the periotic and tympanic bones. 

 Urohyal, in comparative anatomy a bom' 1 

 backward from the basihyal bone and bleu 

 the median elements of the branchial are! 

 Vertex, B., Vertical. See A'., Panetal( Illus. D 

 B.s, Vesalius'. See /.'.,. Sesamoid 

 B., Vomeropalatine, one formed by the In 

 vomer and palate bones. B.s, Wedge-shapet » 



