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Skull II.

Skull II. Dr. Anna L. Kiss Department of Anatomy , Histology and Embryology Semmelweis University 2018. Skull II. Walls of the orbit. Roof: frontal bone (orbital plates) sphenoidal bone (lesser wing) Floor: body of the maxilla palatine bone

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Skull II.

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  1. Skull II. Dr. Anna L. Kiss Department of Anatomy, Histology and Embryology Semmelweis University 2018

  2. Skull II.

  3. Walls of the orbit • Roof: frontal bone (orbital plates) sphenoidal bone (lesser wing) • Floor: body of the maxilla palatine bone • Medial wall: ethmoidal bone (orbital plate) lacrimal bone frontal process of the maxilla • Lateral wall: sphenoidal bone (greater wing) zygomatic bone • Entrance: aditus orbitae

  4. Connections of the orbit • Opticcanal: fossa cranii ant. media: opticnerve + ophtalmic art. • Sup. orb. fissure : fossa craniimedia: oculomotory n. trochlear n. abducens n. ophtalmic n. (V/1) sup. ophtalmic v. • Inf. orbitalfissure: ossapterygopal. : infraorbital a. and n. • Ant.ethmoid.foramen: fossa cranii ant.: ant. ethmoidal a. and n. • Post. ethm. Foramen: ethmoidalcellulae: post. ethmoid. a. and n.

  5. Connetions of the orbit • Inf. orbital groove and canal • Canalis nasolacrimalis: inf. nasal meatus: nasolacrimal duct • Infraorbital foramen: fossa canina: infraorbital a. and n. • Incisura fronatalis: frontal area: frontal a. and n. • Supraorbital foramen: frontal area: supraorbital a. and n. • Zygomatic canal: lateral part of the face temporal fossa: zygomatic n.

  6. Nasal cavity • Entrance: piriformeaperture • Exit:choanae • Cavity: • nasalseptum:bony: - perpendicularplate of the - ethmoidalbone+vomer cartilagenous • Commonnasalmeatus: is dividedbyconchas • Superior, middle and inferiornasalmeatus

  7. palatine bone pterygoid process (sphenoidal bone) body of the sphenoidal bone

  8. Walls of the nasal cavtity • Superiorwall:nasalbone frontalbone (nasal part) cribriformeplate of theethmoidalbone body of thesphenoidalbone (sphenoethmoidalrecess) body of thesphenoidalbone

  9. sphenoidal sinus

  10. Inferiorwall:hardpalate (maxilla+palatinebone) • Lateralwall:nasalconchae (superior, middle: ethmoidalbone, • inferior: separatebone) • belowthemiddlenasalconcha: ethmoidalcellulae: ethmoidal bulla, uncinateprocesssemilunarhiatus Semilunar hiatus: binds the paranasal sinuses with each other

  11. Paranasal sinuses • Frontal sinus: semilunar hiatus (anterior part) • Sphenoidal sinus: sphenoethmoidal recess • Maxillary sinus: semilunar hiatus (posterior part) • Ethmoidal cellulae: semilunar hiatus (middle group)+superior nasal meatus (postrior group)

  12. Pterygopalatine fossa

  13. Connections of the pterygopalatine fossa • Middle cranial fossa foramen rotundum maxillary n. (V/2) • Nasal cavity sphenopalatine foramen art.+nerves • External surface of the skull pterygoid canal greater petr. n. • Orbit inferior orbital fissure maxillary n. (V/2) • Oral cavity greater palatine canal nerves+art. • Infratemporal fossa pterygomaxillary fissure nerves (V/2)

  14. Muscles of the skull 1.) Mimetic muscles - no fascia - tightly attached to the skin - innervation: facial nerve - are around the openings of the skull 2.) Muscles of mastication - fascia (temporalis; parotideo- masseteric) - innervation: trigeminal nerve - around the temporomandibular joint

  15. Muscles of the skull: mimetic muscles Epicranius m. frontalbelly Orbicularisoculi m. Laevatorlabiisup. Orbicularisoris m. Laevatorangulioris Buccinator m.

  16. Muscles of the skull: mimetic muscles Mimetic muscles: facial nerve (VII) platysm

  17. Muscles of the skull: muscles of mastication

  18. Muscles of the skull: muscles of mastication External pterygoid m. Internal pterygoid m.

  19. Muscles of the skull: muscles of mastication Masseteric m.

  20. Muscles of the skull: muscles of mastication Innervated: V/3 (mandibular n.)

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