Biology 223

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Biology 223 Human Anatomy for Biology Majors Week
8 Lecture 1 Monday Dr. Stuart S. Sumida
Overview of Structure of the Adult Skull
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• The developing skull has three component origins
• Condrocranium (base of skull / braincase)
• Dermatocranium (flat bones of skull)
• Splanchnocranium (bones derived from gill arch
  elements)

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• Mode of Germ Layer
• Formation Origin
• Condrocranium Endochondral Mesoderm
• Dermatocranium Dermal Neural Crest
• Splanchnocranium Endochondral Neural Crest

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• CHONDROCRANIUM Bones of the base of the skull.
• Most major cranial nerves escape the skull
  through these.
• Endochondral
• Mesodermal
• Include ethmoid, sphenoid (part), occipital
  (part) right and left temporal (parts).

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Flat bones of skull DERMATOCRANIUM (These
and others.)
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Gill slit bones become SPLANCHNOCRANIUM
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Mandible (Lower Jaw)
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Skull Anterior View
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Anterior Inferior
Frontal
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Ethmoid
superior
lateral
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Bones of the Orbit
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Skull Lateral View
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Maxilla Lateral View
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External Internal
Parietal
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Temporal
Internal
External
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Neonatal Temporal Bone
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Skull Superior View
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Skull Posterior View
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Inferior Internal
Occipital
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Skull Inferior View
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Hard Palate
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Infratemporal Region
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Skull Internal View
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Sphenoid
Occipital
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Major Ligaments Near Jaw Joint
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Major Ligaments Near Jaw Joint Stylomandibular
Sphenomandibular
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Bones of the Basicranium Ethmoid Sphenoid Tempora
l Occipital
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Anterior Posterior
Sphenoid
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Dermal Roofing Bones Nasals Frontal Parietals
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Dermal Facial Bones Maxilla Zygomatic Lacrimal
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Maxilla Lateral View
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Bones of the Orbit
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Dermal Palatal Bones Maxilla Palatine Vomer
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Hard Palate
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Bones of Splanchnopleure Sphenoid Greater
Wing Temporal Styloid Process Middle Ear Ossicles
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Middle Ear Ossicles Malleus Incus Stapes
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Malleus
Incus Stapes
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