Frontal tuber (tuberosity). Tuber frontale (emi-nentia frontalis). A

Superciliary arch. Arcus superciliaris. Bonyeleva-tion above the upper margin ofthe orbit. AB Glabella. Landmark between the two superciliary arches. A 6a Frontal (metopic) suture. [Sutura frontalis]. Cf. page 54.11

Supraorbital border. Margo supraorbitalis. Upper orbital margin of frontal bone. A B Supraorbital notch or foramen. Incisura supraorbitalis/foramen supraorbitale. Notch or hole in the supraorbital margin for the supraorbital artery and lateral branch of the supraorbital nerve. Pressure point for the first branch of the trigeminal nerve. A B Frontal notch or foramen. Incisura frontalis/ foramen frontale. Notch or foramen medial to the supraorbital foramen for the supratrochlear artery and the medial branch of the supraorbital nerve. A B

10 Temporal surface. Facies temporalis. External, lateral surface of the frontal bone. A B

11 Parietal border. Margo parietalis. Posterior margin of frontal bone which articulates with the parietal bone. A C

Temporal line of frontal bone. Linea temporalis ossis frontalis. Continuation of the line formed by the union of the superior and inferior temporal lines of the parietal bone. A Zygomatic process of frontal bone. Processus zy-gomaticus ossis frontalis. Process situated lateral to the orbit for articulation with the zygo-matic bone. A B C

14 Internal surface. Facies interna.The internal or cerebral surface of the frontal bone. C

15 Frontal crest. Crista frontalis. A median ridge on the anterior internal surface of the frontal bone for attachment of the falx cerebri. C

16 Groove for superior sagittal sinus. Sulcus sinus sagittalis superioris. Its margins come together as it passes downward and become continuous with the frontal crest. C

17 Foramen cecum. Foramen caecum. Canal behind the frontal crest. Itusuallyends blindlybutcon-tains an emissary vein when patent. C

17 a Sutura frontalis metopica. Persistent frontal suture in the adult. A

18 Nasal part of frontal bone. Pars nasalis ossis frontalis. Middle segment between the two orbital parts of the frontal bone. A B

19 Nasal spine. Spina nasalis. Pointed median structure projecting from the pars nasalis. ABC

20 Nasal border. Margo nasalis. Serrated lower margin of the nasal part of the frontal bone. It articulates with the right and left nasal bones. ABC

21 Orbital part. Pars orbitalis.The part of the frontal bone forming the roof of the orbit. A B C

22 Orbital surface. Facies orbitalis. The surface of the frontal bone facing the orbit. B

23 Trochlear spine. [Spina trochlearis]. Small bony spicule occasionally present on the anterosupe-rior part of the medial angle of the orbit for the attachment of the trochlea of the superior oblique muscle. A

24 Trochlear fovea. Fovea trochlearis. Small depression for attachment of a cartilaginous sling (trochlea or pulley) and passage of the tendon of the superior oblique muscle. AB

25 Ethmoidal foramina. Foramina ethmoidalia. Openings for the ethmoidal vessels and nerves. B Cf. page 20.12

26 Fossa for lacrimal gland. Fossa glandulae lacri-malis. Depression for the lacrimal gland in the lateral angle of the orbit. B

27 Ethmoid notch. Incisura ethmoidalis. Space between the right and left orbital parts of the frontal bone in which the ethmoid bone is lodged. B

28 Frontal sinus. Sinus frontalis. It averages 3 cm highand2.5 cmwide and often extends 1.8 cm posteriorly, thereby forming a part of the orbital roof. A

29 Opening of frontal sinus. Apertura sinus frontalis. Medial opening on the floor of the frontal sinus for discharge of secretions into the nasal cavity. Located at the ethmoidal infundibulum below the middle nasal concha. B C

30 Septum of frontal sinus. Septum intersinuale frontale. Partition between the right and left frontal sinuses. A

1 Ethmoid bone. Os ethmoidale. Unpaired bone in the ethmoid notch of the frontal bone. A BCD

2 Cribriform plate and foramina. Lamina et foramina cribrosa. Elongated horizontal plate occupying the median plane between the nasal cavity and the anterior cranial fossa. Its numerous foramina transmit the olfactory nerve fibers. B

3 Crista galli. Small bony process that projects upward from the anterior cranial fossa and gives attachment to the falx cerebri. A B C D

4 Ala of crista galli. Ala cristae galli. Winglike, paired process for connection of the crista galli to the frontal crest. A B C D

5 Perpendicular plate. Lamina perpendicularis. It extends downward from the ethmoid bone and forms the upper part of the nasal septum. A B C

6 Ethmoidal labyrinth. Labyrinthus ethmoidalis. Collective term for the ethmoidal air cells situated between the orbital and nasal cavities.

7 Ethmoidal air cells. Cellulae ethmoidales. A C

8 Ethmoidal infundibulum. Infundibulum ethmoidale. Narrow, oblong canal below the middle nasal concha and between the uncinate process and ethmoidal bulla. It receives the openings of the frontal and maxillary sinuses as well as the anterior ethmoidal air cells. A C

9 Hiatus semilunaris. Opening of the infun-dibulum that faces the nose. C

10 Bulla ethmoidalis. An anterior elevation formed by an especially large and wide eth-moidal air cell which compresses the ethmoidal infundibulum. A

11 Orbital plate. Lamina orbitalis. A very thin bony plate which forms part of the medial wall ofthe orbit. [[Lamina papyracea]]. C

12 Ethmoidal foramina. Foramina ethmoidalia. Holes or grooves at the border to the frontal bone for the passage of ethmoidal nerves, arteries and veins to and from the orbit. C Cf. page 18.25

13 [Concha nasalis suprema]. Highest, rudimentary nasal concha. D

14 Superior nasal concha. Concha nasalis superior. AD

15 Middle nasal concha. Concha nasalis media. A C D

16 Uncinate process. Processus uncinatus. Hooklike process that extends posteriorly and inferi-orly from the ethmoid bone. It is almost entirely concealed by the middle nasal concha and partially closes the semilunar hiatus. A C

17 Inferior nasal concha. Concha nasalis inferior. Independent lower nasal concha attached to the lateral nasal wall. E

18 Lacrimal process. Processus lacrimalis. Process that projects anterosuperiorly from the inferior nasal concha. E

19 Maxillary process. Processus maxillaris. Lateral process which forms a part of the medial wall of the maxillary sinus. E

20 Ethmoidal process. Processus ethmoidalis. It is united with the uncinate process ofthe ethmoid bone. E

21 Lacrimal bone. Os lacrimale. Bone in front of the orbital plate of the ethmoid bone. F

22 Posterior lacrimal crest. Crista lacrimalis posterior. Ridge forming the posterior border of the entrance into the nasolacrimal canal. F

23 Lacrimal sulcus of lacrimal bone. Sulcus lacrimalis. Groove-like beginning of the nasolacri-mal canal. F

24 Lacrimal hamulus. Hamulus lacrimalis. Hooklike lower margin of the entrance into the na-solacrimal canal. F

25 Fossa for lacrimal sac. [[Fossa sacci lacrimalis]]. Enlarged area for the nasolacrimal sac located at the beginning of the nasolacrimal canal. F

26 Nasal bone. Os nasale. Bone between the right and left halves of the maxilla. The superior part articulates with the frontal bone. G

27 Ethmoidal sulcus. Sulcus ethmoidalis. Groove on the undersurfaceofthe nasal bone for the external nasal branch of the anterior ethmoidal nerve. G

27 a Nasal foramina. Foramina nasalia. Inconstant opening for branches of the external nasal and anterior ethmoidal nerves and vessels.

28 Vomer. Unpaired bone forming a part of the nasal septum and lying between the sphenoid, maxillary and palatine bones as well as the perpendicular plate of the ethmoid. H

29 Ala of vomer. Ala vomeris. Wing-like process for articulation with the sphenoid and palatine bones. H

30 Sulcus vomeris. Oblique groove for the naso-palatine nerve and its accompanying vessels. H

30a Choanal crest of vomer. Crista choanalis vomeris. Posterior edge of vomer separating the two choanae. H

30b Cuneiform part of vomer. Pars cuneiformis vomeris. Wedge-shaped part ofvomer. H

2 Maxilla. Upper jaw. A B

3 Body of maxilla. Corpus maxillae. Central part of the maxilla enclosing the maxillary sinus. A

4 Orbital surface. Facies orbitalis. Surface of the maxilla forming a portion of the floor of the orbit. A

5 Infraorbital canal. Canalis infraorbitalis. Canal for the infraorbital artery and nerve. A

6 Infraorbital groove. Sulcus infraorbitalis. Groove at the beginning of the infraorbital canal. A

7 Infraorbital margin. Margo infraorbitalis. Lower margin of the orbit formed in part by the maxilla. A

8 Anterior surface. Facies anterior. A

9 Infraorbital foramen. Foramen infraorbitale. Opening of the infraorbital canal traversed by the infraorbital nerve and its accompanying artery. Pressure point for the second division of the trigeminal nerve. A

10 Canine fossa. Fossa canina. Depressed area belowthe infraorbital canal. Site of origin of le-vator anguli oris muscle. A

11 Nasal notch. Incisura nasalis. Curved margin of the bony anterior nasal (piriform) aperture. A

12 Anterior nasal spine. Spina nasalis anterior. Spinous projection at the lower boundary of the anterior nasal aperture. Attachment site of the cartilaginous nasal septum. A B

13 Zygomaticomaxillary suture. Sutura zygomati-comaxillaris. Suture occasionally present from the infraorbital margin to the infraorbital foramen. A

14 Infratemporal surface. Facies infratemporalis. Surface of the maxilla situated behind the zygomatic process. A

15 Alveolar foramina. Foramina alveolaria. Small openings on the infratemporal surface for passage of nerves and vessels to the molars. A

16 Alveolar canals. Canales alveolares. Canals leading to the alveolar foramina for the transport of nerves and vessels for the teeth. A

17 Tuber of maxilla. Tuber maxillare (eminentia maxillaris). Thin-walled tuberosity on the posterior wall of the maxillary sinus. A

18 Nasal surface. Facies nasalis. Medial surface of maxilla forming a portion of the lateral nasal wall. B

19 Lacrimal sulcus. Sulcus lacrimalis. Groove for the nasolacrimal duct. B

20 Conchal crest. Crista conchalis. Oblique ridge for attachment of the inferior nasal concha. B

21 Lacrimal margin. Margo lacrimalis. Border of the maxilla articulating with the lacrimal bone. AB

22 Maxillary hiatus. Hiatus maxillaris. Large opening in the medial bony wall of the maxillary sinus. It is bounded by the uncinate, maxillary, and ethmoidal processes and by the palatine bone. This leaves only a narrow opening to the maxillary sinus at the upper edge of its medial wall. B

23 Greater palatine sulcus [[pterygopalatine sulcus]]. Sulcus palatinus major [[sulcus ptery-gopalatinus]]. Groove at the posterior border of the maxilla. It combines with a similar groove on the palatine bone to form a canal for the greater palatine nerve and descending palatine artery. B

24 Maxillary sinus. Sinus maxillaris. Paranasal cavity within the body of the maxilla. It measures over 3 cm vertically and sagittally and 2.5 cm in the frontal plane. Its floor usually lies at least 1 cm below the floor of the nasal cavity. B

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