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PROCESS 



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PROCESSUS 



fos 



surface forms the back part of the floor of the orbit. 

 Ps., Palatal, the processes of the superior maxillary 

 plates of the embryo which join to form the bony 

 palate. P., Palate, a thick process projecting hori- 

 zontally inward from the inner surface of the superior 

 maxillary bone, and forming part of the floor of the 

 nostril and the roof of the mouth. P., Palatine. 

 Synonym of P., Palate. P., Paracondyloid, an 

 anomalous process on the lower surface of the occipital 

 bone. When present it articulates with the transverse 



of the atlas. P., Paramastoid, P., Paroc- 

 cipital. Synonyms of P., Paracondyloid. P., Pitui- 

 tary. Synonym of Pituitary Body. P., Pneumatic, 

 a process sometimes present on the occipital bone, con- 

 taining air cells that communicate with the mastoid 

 lis. P., Posterior Clinoid. See P., Clinoid. P., 

 ost-glenoid, a small tubercle separating the glenoid 

 ,sa from the auditory process. P., Premaxillary. 

 Synonym of P., Frontonasal . P., Protoplasmic : 

 I. The branched processes of nerve-cells that are not 

 continued as axis-cylinders. 2. The pseudopoda of 

 ameboid cells. P., Pterygoid [of the Palate Bone), 

 a pyramidal process projecting from the posterior 

 border of the palate bone and articulating with the 

 sphenoid bone. Ps., Pterygoid (of the Sphenoid 



| rocesses, one on each side, descending per- 

 pendicularly from the point of junction of the body 

 with the greater wings of the sphenoid bone. Each 

 process consists of an external and an internal plate. 

 Ps., Pterygo-palatal. Synonym of Ps., Palatal. 

 P., Pulp, a process connecting an odontoblast with a 

 cell in the dental pulp. Ps., Pyramidal. Synonym 

 of Pyramids of Ferrein. P. of Rau. Synonym of 

 P., Long [of the Malleus). P., Reticular, a network 

 of interlacing processes of gray and white matter in 

 the spinal cord, which is visible in a cross-section and 

 is situated near the center of the gray crescents. It 

 is seen best in the cervical region of the cord. P., 

 Short [of the Incus), a conic process projecting almost 

 horizontally backward from the body of the incus and 

 attached by ligamentous fibers to the margin of the 

 opening leading into the mastoid cells. P., Short (of 

 a slight projection from the root of the 

 manubrium of the malleus, lying in contact with the 

 tympanic membrane. P., Sphenoidal, a thin plate of 

 bone directed upward and inward from the vertical 

 plate of the palate bone. Ps., Spinous (of the 



prominent eminences on the anterior and 

 posterior borders of the ilium. The upper process on 

 the anterior border is the anterior superior spinous 



of the ilium. It can be readily felt, and is an 

 important landmark. Below it is the anterior inferior 

 spinous process, which gives attachment to the straight 

 tendon of the rectus femoris muscle and to the ilio- 

 tibial band. On the posterior border there are also 

 two processes — a posterior superior and a posterior 

 inferior. P., Spinous (of the Sphenoid Bone), a 

 rough prominence descending from the posterior part 

 of the greater wing of the sphenoid bone. It receives 

 the attachment of the internal lateral ligament of the 

 jaw and the tensor palati muscle. P., Spinous (of 

 the Tibia), an eminence of bone on the upper surface 

 of the tibia, between the two articular surfaces, and 

 nearer to the posterior than the anterior border. P., 

 Spinous (of a Vertebra), the prominent backward pro- 

 jection from the middle of the posterior portion of the 

 arch of a vertebra. P., Styloid (of the Fibula), a. 

 pointed eminence projecting upward from the posterior 

 portion of the head of the fibula. P., Styloid (of 

 the Radius), a projection from the external border of 

 the lower extremity of the radius. P., Styloid (of 

 the Temporal Bone), a sharp spine about an inch in 



length descending downward, forward, and inward 

 from the inferior surface of the petrous portion of the 

 temporal bone. P., Styloid (of the Ulna), a projec- 

 tion from the inner and posterior portion of the 

 lower extremity of the ulna. Ps., Subgerminal, out- 

 growths from the inner surface of the epiblast (His). 

 P., Superior Maxillary, an eminence on the face of 

 the embryo which gives rise to the superior maxilla 

 and the malar bone. P., Superior Vermiform, the 

 upper part of the median lobe of the cerebellum, 

 which connects together the two lateral hemispheres. 

 It consists of the lobulus centralis, the monticulus 

 cerebelli, and the commissura simplex. P., Temporal, 

 the posterior angle of the malar bone by which it 

 articulates with the zygomatic process of the temporal 

 bone. P., Transverse, a process projecting outward 

 from the side of a vertebra, at the junction of the 

 pedicle and the lamina. P., Tubercular, Trans- 

 verse, the lower transverse process of a vertebra, or 

 the one which articulates with the tuberculum of a 

 rib. It is best marked in the lower vertebrates. P., 

 Unbranched. Synonym of P., Axis-cylinder. P., 

 Unciform (of the Ethmoid Bone), a hook-like projec- 

 tion from the inferior portion of each lateral mass of 

 the ethmoid bone. It articulates with the ethmoidal 

 process of the inferior turbinated bone. P., Unci- 

 form (of the Hippocampal Gyrus), a hook-like projec- 

 tion from the anterior end of the gyrus hippocampi. 

 P., Unciform (of the Unciform Bone), a hook-like 

 projection from the palmar surface of the unciform 

 bone. P., Uncinate. Synonym of P., Unciform. 

 P., Ungual, the distal extremity of a terminal 

 phalanx. P., Vaginal (of Peritoneum), the process 

 of peritoneum which the testicle in its descent carries 

 in advance, and which in the scrotum forms the tunica 

 vaginalis testis. P., Vaginal (of the Sphenoid Bone), 

 a projection from the inferior surface of the body of 

 the sphenoid bone, running horizontally inward from 

 near the base of the pterygoid process. P., Vaginal 

 (of the Temporal Bone), a sheath-like plate of bone 

 which extends from the carotid canal to the mastoid 

 process. It separates behind into two lamina?, which 

 enclose the styloid process. P., Vermiform : I. See 

 P., Inferior Vermiform, and P., Superior Vermiform. 

 2. The vermiform appendix of the cecum. See Ver- 

 miform Appendix. P., Vocal (of the Arytenoid Car- 

 tilage), the anterior angle of the arytenoid cartilage 

 receiving the attachment of the true vocal band. P., 

 Xyphoid, the ensiform cartilage. P., Zygomatic (of 

 the Malar Bone), a long, serrated process which 

 articulates with the zygomatic process of the temporal 

 bone. P., Zygomatic (of the Temporal Bone), a 

 long projection from the lower part of the squamous 

 portion of the temporal bone ; it articulates with the 

 malar bone. 

 Processus (pro-ses'-us) [L.j. Synonym of Process. 

 P. a cerebello ad medullam spinalem. Synonym 

 of Peduncle, Superior Cerebellar. P. acromialis. 

 Synonym of Acromion. P. ad cerebrum. Synonym 

 of Peduncle, Superior Cerebellar. P. ad medullam, 

 the inferior peduncles of the cerebellum. P. ad pon- 

 tem, the middle peduncles of the cerebellum connect- 

 ing together its two hemispheres. P. ad testes. Syn- 

 onym of Peduncles, Superior Cerebellar. P. alati, the 

 wings of the sphenoid bone. P. anconaeus. Syn- 

 onym of Olecranon. P. ancoralis. Synonym of 

 Process, Coracoid. P. annularis. Synonym of Pons 

 varolii. P. anterioris mallei. Synonym of Process, 

 Long (of the Malleus) . P. articulares sporii, small 

 prominences on the posterior surface of the sacrum, 

 internal to the posterior sacral foramina, being the 

 rudiments of the articular processes of the sacral verte- 



