SINUS 



Mammary Gland. See Ampulla ductus lactifert. S., 

 Marginal, a variety of the occipital sinus opening 

 into the transverse. S., Marginal {of the placenta). 

 See .V., Circular {of the placenta). S. marginalis. 

 See S., Marginal. S., Mastoid. See Mastoid Cells. 

 S. mastoideus. See Mastoid Cells. S. max- 

 illaris. See Maxillary Antrum. S., Maxillary. 

 See Maxillary Antrum. S. maximus. See Olec- 



■ ranon Fossa and S., Great {of the aorta). S. maxi- 

 mus aorta;. See S., Great {of the aorta). S. 

 maximus cubitalis (seu humeri). See Olecranon 



I Fos*a. S., median saeptum. See S. , Superior Longi- 

 tudinal. S., Median, Superior. See 5., Superior 



| Longitudinal. S. medianus. See Vestibular Sac- 



i cule. S. mediastinocostalis {pleura), the part of 

 the pleura where the costal and mediastinal portions 

 unite behind the sternum. S. mediastinophrenicus, 

 the part of the pleura where the mediastinal and dia- 

 phragmatic portions unite. S. of Morgagni, the in- 

 terval between the upper border of the superior con- 

 strictor muscle and the basilar process of the occipital 

 bone. See Lacuna? morgagni, S. of Valsalva, and 

 Ventricle of the Larynx. S. mucosi urethrae. See 

 Lacuna morgagni. S. muliebris. See Vagina. 

 S. nasi accessorii, the various air-sinuses connected 

 with the nose. S. obliquus. See S., Straight. S., 

 Occipital, a small venous sinus in the attached mar- 

 gin of the falx cerebelli, opening into the torcular 

 herophili. See S., Lateral. S. occipitalis, S. 

 occipitalis posterior. See S., Occipital. S. occip- 

 italis anterior. See S., Transverse. S. occipit- 

 alis transversus. See S., Transverse. S. opertus 

 minor. See Occipital Fissure. S. ophthalmicus. 



I See S., Cavernous. S. ophthalmopetrosus, an 

 malous opening into the transverse sinus. S. 

 palatinus. See Ethmoid Cells, Posterior. S. 

 parieto-occipitalis. See Occipital Fissure. S. 

 pedis, the internal sinus between the astragalus 

 I the os calcis. S. pericardiacocostalis, the 

 mediastinocostal sinus. S. pericardii. See S. 

 -.-versus pericardii. S. perpendicularis. See 

 Straight. S., Petit's. See S. of Valsalva. S. 

 petrobasilaris. See S., Superior Petrosal. S. 

 petro-occipitalis inferior, a vein uniting the cav- 

 ernous sinus and the circellus venosus hypoglossi. 

 S., Petro-occipitalis superior. See S., Superior 

 Petrosal. S., Petrosal, venous sinuses along the 

 borders of the petrous portion of the temporal bone. 

 S., Petroso-squamous. See S., Petrosquamous. 

 S. petro-squamous, a venous sinus running along the 

 petro-squamous suture, and opening into the transverse 

 sinus ; it is believed to be a relic of a fetal communica- 

 tion with the internal jugular vein. S. petrosus 

 inferior. See S., Inferior Petrosal. S. petrosus 

 melius, an anomalous communication between the 

 inferior and superior petrosal sinuses. S. petrosus 

 profundus. See S., Inferior Petrosal. S. petrosus 

 superficialis (seu superior) . See S. , Superior Petrosal. 

 S., Pharyngo-laryngeal. See Fossa laryngopharyn- 

 \gea. S. pharyngolaryngei. See Fossa laryngo- 

 | pharyngea. S. phrenicocostalis, the part of the pleura 

 where the costal and diaphragmatic portions join. S. 

 phrenicomediastinalis. See S. mediastinophreni- 

 S., Pilo-nidal. See Foveola coccygea. S. 

 pituitarius frontis. See S., Frontal. S.,' Placen- 

 tal. See S., Utero-placental. S. pleurae, the spaces 

 m the pleural sac, along the lower and inferior por- 

 tions of the lung, which the lung does not occupy. 

 3. pocularis. See Uterus masculinus. S. of the 

 I Portal Vein, an enlargement of the portal vein near 

 he right end of the transverse fissure of the liver. S., 

 Posterior Basilar. See S., Occipital. S., Posterior 



1331 SINUS 



Ethmoid. See Ethmoid Cells, Posterior. S., Pos- 

 terior Occipital. See S., Occipital. S. primus et 

 secundus {of Galen), the transverse sinus. S., 

 Prostatic. See Uterus masculinus. S. prostaticus. 

 See Uterus masculinus. S. protuberantiae annu- 

 laris, the basilar groove of the pons. S. pulmon- 

 alis, the atrium of the left auricle. S., Pulmonary. 

 See S. pulmonalis. S., Pyramidal {of the lar- 

 ynx). See Fossa laryngopharyngea. S. pyriformis. 

 See Fossa laryngopharyngea and Fossa, Hyoid. 

 S. quartus. I. The fourth ventricle of the brain. 2. 

 {Of Galen). See S., Straight. S. quartus aortas. 

 See S., Great {of the aorta). S. quintus, the fifth 

 ventricle of the brain. S. ad radicem linguae (Mor- 

 gagni) . See Foramen ccecum {of the tongue). S. rectus. 

 See S., Straight. S. renalis. See S. of the Kidney 

 and Hilum of the Kidney. S. reuniens. See Meatus 

 venosus. S. Rhomboidal, S. Rhomboid : i. A dila- 

 tation in the sacral region of the central canal of the 

 spinal cord of birds. 2. The fourth ventricle of the 

 brain. S. rhomboidalis, the fourth ventricle of the 

 brain. S. rhomboidalis lumbalis, the expansion 

 of the central canal of the spinal cord near the 

 lumbar enlargement. S., rhomboideus, the fourth 

 ventricle of the brain. S., Ridley's. See S., Circular. 

 S. saepti (lucidi), the fifth ventricle of the brain. S. 

 sagittalis superior. See S., Superior Longitudinal. 

 S. secundus. See S. , Superior Petrosal. S. of the 

 Seminiferous Tubules. See Corpus highmori. S. 

 semiovalis. See Fovea hemielliptica. S. Septimus 

 {of Guidi ), the superior longitudinal sinus. S. sig- 

 moideus. See S., Lateral. S. speculi, the fifth ven- 

 tricle of the brain. S., Sphenoid, air-sinuses which 

 occupy the body of the sphenoid bone and communi- 

 cate with the nasal cavity. S., Sphenoparietal, a 

 vein uniting the cavernous sinus and a meningeal 

 vein. S. sphenoparietalis. See S., Sphenopa- 

 rietal. S. squamopetrosus. See S., Petrosquamous. 

 S., Straight {of the tentorium), a sinus which is con- 

 tinuous with the inferior longitudinal sinus and, run- 

 ning along the junction of the falx cerebri and ten- 

 torium, is continuous with the lateral sinus. S. subar- 

 achnoidal. See Subarachnoid Space. S. sulci- 

 formis. See Fossula sulciformis. S. sulciformis 

 (Morgagni), the Aditus ad aquadnctum sylvii. S., 

 Superior Longitudinal, a triangular canal which 

 runs along the upper edge of the falx cerebri, 

 beginning in front at the crista galli and terminating 

 at the torcular. It is received into a median 

 groove in the frontal, parietal, and occipital bones. 

 S., Superior Petrosal, a venous canal running in 

 a groove in the petrous portion of the temporal bone 

 extending from the posterior part of the cavernous 

 sinus to the lateral sinus on the mastoid portion of 

 the temporal bone. S., Tarsal, the passage between 

 the tarsal bones occupied by the intertarsal ligament. 

 S. tentorii. See S., Straight. S. tentorii lateralis. 

 See S., Superior Petrosal. S. tentorii lateralis 

 (seu posterior). See S., Lateral. S. tentorii me- 

 dius. See 5"., Straight. S. tentorii medius (seu 

 posterior). See S., Straight. S., Terminal. I. See 

 S. terminalis. 2. Of Toldt. sinus-like spaces near the 

 hilum of a lymph-gland. S. terminalis, a vein that 

 encircles the vascular area of the blastoderm, and 

 empties either by one trunk, the anterior vitelline 

 vein, into the left vitelline vein, or by two trunks into 

 both vitelline veins. S. tertius, the third ventricle 

 of the brain. S., Transverse : I. A sinus uniting 

 the inferior petrosal sinuses. 2. A venous network 

 in the dura over the basilar process of the occipital 

 bone. It opens into the inferior petrosal and the 

 anterior spinal veins. S. transversus. See S., 



