Skull. Sphenoid and Ethmoid bones

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1 Skull. Sphenoid and Ethmoid bones PhD., Dr. David Lendvai Department of Anatomy, Histology and Embriology Semmelweis University, Faculty of Medicine 2018.

2 Skeletal system

3 Structure of the skull Border between viscerocrainum and neurocranium Calvaria

4 Constitute by 22 bones: Main parts of the skull neurocranium (8) UNPAIRED: frontal, occipital, sphenoid, ethmoid bones PAIRED: temporal, parietal bones viscerocranium (14) -UNPAIRED: mandibule, vomer. PAIRED: nasal, maxilla, zygomatic, lacrimal, palatine, inferior nasal concha Their role formation of cavities, protect viscera, voice formation, initial portions of the gastrointerstinal and respiratory systems, insertion of muscles (mascication, head movements) Cavities: - Cranial cavity, - Nasal cavity, - Paranasal sinuses - Oral cavity, - Orbit, - (Tympanic cavity, Inner ear)

5 Connections between cranial bones Synchondrosis, synostosis (cartilagineal and bony connections) Sutures Coronal Sagittal Lambdoid

6 Calvaria and the base of the skull External aspect of the calvaria Calvaria Base of the skull Internal aspect of the calvaria

7 Fossae cranii Anterior cranial fossa MIddle cranial fossa Posterior cranial fossa Anterior cranial fossa: frontal, ethmoid, lesser wings of sphenoid Middle cranial fossa: sphenoid, temporal bones, parietal bones Posterior cranial fossa: Occipital, temporal bones, parietal bones

8 Bones of the neurocranium Frontal bone Parietal bone Temporal bone Ethmoid Sphenoid

9 Braus Sphenoid bone Part of the external skull base (- body (Corpus), pterygoid process, greater wing (Ala major)

10 Braus Sphenoid bone Part of the temporal fossa, greater wing (Ala major)

11 Sphenoid bone Braus Part of the internal skull base (Corpus, Ala minor, Ala major)

12 Sphenoid bone sphenooccipital synchondrosis: ossified in the beginning of adulthood About the age of 18 can be the occipital bone and the sphenoid bone no longer separated from each other (synostosis) Connections to the others bones by sutures, with the passage of time also often ossified

13 Body of sphenoid: - (cuboid shape) Sphenoid - Posterior surface - connected to the basilary part of the occipital bone - Inferior surface - connected to vomer - Superior surface - sella turcica, tuberculum sellae, dorsum sellae, (anterior/middle/posterior clinoid process) - Anterior surface faceing to the nasal cavity (aperture of sphenoidal sinus) Occipital bone - Lateral surfaces origin of greater wings and the position of carotic grooves

14 Sphenoid Surfaces of the greater wing: - orbital surface - maxillar surface (around foramen rotundum) - temporal surface - infratemporal surface - cerebral surface

15

16 Sphenoid bone Os sphecoideum ~ Wasp ~ Os vespiforme Os sphenoidale = cuneiform Os cuneiforme, alatum, pterygoideum, polymorphon, carinae, colatorii, paxillare

17

18 2 3 3 X Faller 1. sphenoidal sinus 2. lesser wing of sphenoid bone 3. greater wing of sphenoid bone 4. lateral pterygoid plate 5. medial pterygoid plate

19 view: anterior Faller 1. sphenoidal sinus 2. lesser wing of sphenoid bone 3. greater wing of sphenoid bone 4. lateral pterygoid plate 5. medial pterygoid plate

20 view: anterior Sobotta

21 Sobotta Formation of the posterior and lateral wall of the orbit

22 view: anterior Thumfart

23 view: posterior Sobotta

24 Sphenoid sinus - sinus sphenoidalis; Turkish Saddle - Sella turcica Eördögh Aesculap B Braun Lang

25 Braus Ethmoidal bone - Os ethmoidale

26 Sobotta Braus

27 Ethmoid bone ANTERIOR ASPECT SUPERIOR ASPECT LATERAL ASPECT

28 - Irregular bone - Forms the wall of orbit and nasal cavity Connects to the frontal, sphenoid, lacrimal bones and the maxilla The lateral massive parts contain the - labyrinth - inside cavtities (ethmoidal cells) Ethmoid bone It forms together with the vomer the bony nasal septum

29 Ethmoid bone Parts: - cribriform plate and foramina - perpendicular plate - orbital plate - ethmoidal labyrinth (cellulae) - superior nasal concha - middle nasal concha - crista galli

30 Sobotta 1 Crista galli 2 Perpendicularis plate 3 Cribriform plate 4 Ethmoidal labyrinth 5 Ethmoidal cells 6 Superior nasal concha 7 Medial nasalis cocha 8 Orbital lamina / papyracea Faller

31 Ethmoid bone Sobotta

32 7 6 Sobotta 7 Faller 6 superior nasal concha 7 medial nasal concha

33 Faller Ethmoidal cells: altogether approx. 30 (= Labyrinthus ethmoid) one of the paranasal sinuses Border between the orbit and the nasal cavity Inflammation: possible complications in the Orbit through the thin lamina papyracea

34 Sobotta Sobotta

35 Thumfart Dr. Magyar Péter

36 Sobotta perpendicular plate of the Ethmoid bone

37 Literature Braus Anatomie des Menschen Band I (Verlag von Julius Springer 1929.) Faller: Anatomie in Stichworten: Ein Arbeitsbuch für Medizinstudenten und praktische Ärzte (Ferdinand Enke Verlag 1988.) Sobotta: Az ember anatómiájának atlasza (Urban & Fischer 2000.) Thumfart: Operative Zugangswege in der HNO-Heilkunde (Thieme 1998.)

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