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Skull II.

Explore the intricate anatomy of the human skull, including the walls of the orbit and nasal cavity, connections of the orbit, nasal cavity structures, paranasal sinuses, and muscles of the skull. Learn about the optic canal, pterygopalatine fossa, and innervation details.

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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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