Skeletal System: Skull.

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1 Skeletal System: Skull

2 Bones of the Skull SPLANCHNOCRANIUM Nasal (2) Maxilla (2) Lacrimal (2) Zygomatic (2) Palatine (2) Inferior concha (2) Vomer Mandible NEUROCRANIUM Frontal Parietal (2) Temporal (2) Occipital Sphenoid Ethmoid EAR OSSICLES Stapes (2) Malleus (2) Incus (2) HYOID

3 2 Functional Areas Splanchnocranium face Neurocranium vault and cranial base

4 Development

5 General Developmental Organization Chondocranium (cranial base) cartilage models (enchochondral ossification) Neurocranial vault from mesenchyme (intramembranous) Viscerocranium from mesenchyme (pharyngeal arches) (intramembranous)

6 Neonatal Skull (neurocranial syndesmoses) Frontal Metopic suture Ant. fontanelle Post. fontanelle

7 795 WUSTL Med School 376 Korean War Dead

8 Functional Matrix Hypothesis Growth of skull bones depends almost entirely on surrounding soft tissues. Bone growth is secondary and compensatory to soft tissue growth

9 Achondroplasia

10 Artificial cranial modification

11 Craniosynostosis Crouzon s Syndrome (coronal synostosis) Apert s Syndrome (extensive synostoses)

12 Trigonocephaly (premature metopic suture closure) W.A. Mozart s cranium

13 Anatomy of the Skull Individual bones Structures within bones Regions Intracranial fossae Temporal fossa, Infratemporal fossa, Pterygopalatine fossa Other structures and landmarks

14 Intracranial Fossae ACF MCF PCF Anterior Cranial Fossa (frontal lobe) Middle Cranial Fossa (temporal lobe) Posterior Cranial Fossa (cerebellum) 9

15 FYI The following slides show pictures and drawings of the skull and individual bones with important landmarks identified. These aren t landmarks that you need to memorize now! You will in the future!

16 Frontal Temporal Sphenoid Lacrimal Zygomatic Superciliary Arch Supraorbital Notch Superior Orbital Fissure Frontal Process (Maxilla) Inferior Orbital Fissure Nasal Zygomatic Arch Maxilla Inferior Nasal Concha Mandible Anterior Nasal Spine Infraorbital Foramen Canine Fossa Mental Foramen Mental Eminence

17 Maxilla Incisive Fossa Greater Palatine Foramen Foramen Lacerum Palatine Foramen Ovale Zygomatic Foramen Spinosum Vomer Mandibular Fossa Sphenoid Temporal Styloid Process Mastoid Process External Auditory Meatus Carotid Canal Hypoglossal Canal Stylomastoid Foramen Occipital Foramen Magnum Jugular Foramen

18 Cribriform Plate Frontal Crista Galli Lesser Wing of Sphenoid Foramen Cecum Optic Foramen Optic Fissure Foramen Lacerum Greater Wing of Sphenoid Sphenoid Sella Turcica Carotid Canal Foramen Ovale Foramen Spinosum Temporal Jugular Foramen Hypoglossal Canal Occipital Foramen Magnum

19 Parietal Frontal Nasal Zygomatic Occipital Maxilla Temporal Sphenoid Mandible

20 Squamosal Suture Coronal Suture Zygomatic Process of the Temporal Bone Superciliary Arch External Auditory Meatus Temporal Process of the Zygomatic Bone Lamdoidal Suture Anterior Nasal Spine External Occipital Protuberance Mental Foramen Mastoid Process Mental Eminence Styloid Process Mandibular Condyle Gonial Angle Mandibular Notch Coronoid Process

21 Frontal process Zygomatic N L e p sphe Infraorbital margin Zygomaticofacial foramen Anterior nasal spine Infraorbital foramen Alveolar process Maxilla, Nasal, Lacrimal Zygomatic

22 Maxilla Palatine Incisive foramen Palatine process Horizontal plate Grtr. palatine for. Posterior nasal spine Lssr. palatine foramina

23 Lssr. wing Cribriform plate Sphenoid Anterior clinoid process Carotid grv. Grtr. wing Grv. optic chiasma Hypophyseal (pituitary) fossa Dorsum sellae Sella turcica Posterior clinoid process

24 Optic canal Superior orbital fissure ---lotsa, V 1 Foramen rotundum ---V 2 Foramen ovale ---V 3 Foramen spinosum ---Middle meningeal a. CN V, Trigeminal Nerve

25 Sphenoid Hamulus Pterygoid fossa Lateral pterygoid plate Vomer Medial pterygoid plate Scaphoid fossa Pterygoid canal Spine

26 Sphenoid Bone, Superior View (with parts visible from inside skull with skullcap removed) Lesser wing Anterior clinoid processes Pituitary fossa Optic canals Greater wing Posterior clinoid processes Dorsum sella Clivus Sella turcica

27 Sphenoid Bone, Anterior View Greater wings Superior orbital fissure Lesser wings Sphenoidal sinuses Pterygoid fossa Pterygoid processes Sphenoidal crest Sphenoidal rostrum (most A-I part of crest) Pterygoid canal Medial & lateral ptyerygoid plates

28 Sphenoid bone, Inferior view (with parts visible from outside of skull) Pterygoid fossa Pterygoid process Medial pterygoid plate Lateral pterygoid plate Infratemporal crests Pterygoid hamulus Foramen ovale Foramen spinosum

29 Infratemporal fossa Fr Pa Sp Te Temporal fossa Zy Mx Pterygomaxillary fissure Pterygopalatine fossa, to Sphenopalatine foramen

30 SUPERIOR Temporal Bone, Lateral view POSTERIOR Squamous portion ANTERIOR Supramastoid crest Suprameatal crest External auditory meatus INFERIOR Mastoid process Tympanic portion Postglenoid process Glenoid fossa Articular eminence Zygomatic process

31 Temporal Bone, Medial view SUPERIOR POSTERIOR ANTERIOR Squamous portion Petrous portion Sigmoid sulcus (gray curve) Zygomatic process Internal auditory meatus INFERIOR

32 Temporal Bone, Inferior view Zygomatic process Articular eminence External auditory meatus Glenoid fossa Postglenoid process Styloid process Occipital groove Mastoid notch Mastoid process

33 Malleus Incus Stapes VII VIII IAM EAM Tympanic membrane

34 Mandible Coronoid process Mandibular foramen Lingula Mand. notch Head Neck Condylar process Ramus Mental protuberance Alveolar process Body Oblique line Angle Mental tubercle Mental foramen

35 Mylohyoid line Mylohyoid groove Rt. submandibular fossa Lt. digastric fossa Rt. mental spine

36 Joints in the Skull - Sutures

37 Fontanelles Bregmatic fontanelle Parietal Frontal Lambdoid fontanelle Anterolateral fontanelle Posterolateral fontanelle Sphenoid Occipital Temporal

38 Sinuses Void chambers Linked to nasal cavity Frontal Maxillary Ethmoid Sphenoid

39 Sinuses Cross-section

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