THE EXTERNAL SURFACE OF THE PARIETAL BONE

SAPPEY.) 1, the parietal eminence; 6, the parietal foramen, (AFTER and articulates with its fellow of the oppesite side in the middle line and with the frontal, the temporal, the sphenoid, and the occipital b's. [L, Lao Eat ie oO te] b. Ab which forms the roof of the craninm in certain fishes, extending from the occipital to the ethmoidal regions and answering to the parietal and frontal b’s of the higher vertebrates. [L, 12.]—Paroccipital b. [owenl: See Epiotic b.—Pea-shaped b. See Pisiform b.—Pedal . Lat., os ped is, The third distal phalanx of the manns of the solipeds, [L, 18.]—Pelvic. Fr., os pelviens. The b’s which constitute the pelvis. [L, 13.]—Penial b. Lat., os penis, os priapi. Fr., os pénien. Ger., Penisknochen. A membrane b. Fond the septum of the penis of certain mammals. [L, 291.]—Periosteal b. Fr., 08 périostique. A b. formed by the osteogenetic layer of the periostenm. It is the principal if not the sole form of adult b., and occurs both in b’s having an intra cartilaginous and in those having an intra membranous o ification. [J, 30, eos b. Ab formed by the confluence of the epiotic, pro-otic, and opisthotic b’s, It represents the mastoid and petrous portions of the temporal b. of man. {L.12, 153.]—Peroneal b. See Frsu.aA.—Petro-mastoid b. Lat., os petromastoideum. See Periotic b.—Petrosal b. Lat., os etrosum, Fr., os pétreux (ou pierreux (1st def.]). Ger., Felsenbein st def.). It., rocea. Sp., hue so pietroso. 1. The petrous portion of the temporal b. 2. As used by the older comparative anatomists, the pro-otie b. [L, 14, 176] 3. The quadrate b. [L, 18.]—Petrotympanic b. Tympano-periotic b.—Pharyngo-branchial. See Superior pharyngeal b’s.—Pisiform b. Lat., os pis i- ‘forme. Fr., os pis i for me. Ger., Erbsenbein. A small, pea-shaped . which lies upon the ulnar side of the pyramidal b. of the carpus. [L, 114, 142.|—Ploughshare b. 1. ee dre 2. See PYGOSTYLE, —Pneumatle. B’s which contain a er number of air-cells or, as in birds, air-sacs. [L, 24.]—Pneumatic occipital b. Of Hyrtl, a small, flat o icle sometimes found at the occipital insertion of the rectus capitis lateral is muscle, containing cells which communicate with those of the mastoid portion of the temporal b, L, 37.)—Post clavicular b. See Epicoracoid b.—Posterior ‘rontal b. See Post frontal b—Posterior pterygoid b. See Meta pterygoid b.—Posterior sphenoid b. See Bas i sphenoid b. —Posterior turbinated b. See Inferior turbinated b,—Post frontal b., Postorbital b. Lat., os frontale poster i us, apophysis orbit aria (So emmer ring]. Fr., 03 frontal postérieur, ' Ger., ae teres Stirnbein. Syn.: temporal 6. (in fishes), jugal b. (in the crocodile) [G. St.-Hilaire]. Ger., vordere RANE Ara (Hallmann]. In com] © anatomy, a membrane b. lying behind the orbit and above the ali sphenoid b. (Ist def.), |L, 12,|—Post or bito supratemporal b. Of Owen, à b. in the skulls of the Ganocephala which represents the (Pacer and supratemporal b’s. 8 [L, 14.]—Post temporal b. [Parker]. See Supra scapular b.— Pre coracoid b. 1. Of Gegenbaur, a nodule of b. lying in front of the ventral extremity of the coracoid b. [L, 201.] 2. Of Sabatier, the coracoid proce of the scapula. [L, 201.|—Prefrontal b. Lat. rs media o is ethmoidei POELE RE), Ger., Nasenbein {Weidemann, Rathke]. Syn.: anterior frontal b., ethmoid b. (in mammals [Cnvier]), lacrymal b. (in fishes), nasal ethmoid 6. (in birds [G. St.-Hilaire]). In comparative anatomy, a b. which is situated in the prefrontal region of the nasal capsule and bounds the exit of the olfactory nerve externally, The perpendicular plate of the ethmoid b. of man represents the coalesced prefrontal b's of the lower vertebrates. [L, 12, 14.]—Prefronto-lacrymal b. A b. in certain Amphibia and snakes which forms the anterior boundary of the orbit. [L, 121.]—Prefronto-nasal b. À b. constituted by the confluence of the prefrontal and nasal b’s. [L, 14.]—Premaxillary b. See In term a zill ary b.—Prenasal b. Syn.: scooping 6. A b. which is situated at the anterior extremity of the nasal