HEAD/NECK I: Introduction

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HEAD/NECK I IntroductionThe Skull

• Head function brainstorm
• Sensory/Motor Targets
• Overview Head/Neck I-IV
• The two-oval skull
• Major features of the skull
• The base of the skull
• The developmental view
• The holes-out view

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What all does the head do?brainstorm
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Nerve targets in head

• SENSORY
• Special General

• MOTOR
• Muscles Glands

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Overview Head/Neck I-IV

• Head I Skulla framework to hang on
• Overall organization of skull
• Base of the skullthe hard part
• Developmental view
• Cranial nerves out (to targets)
• Head II Throat targets
• Head III Special Sense targets
• Head IV Cranial nerves in depth

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Overall skull organization

• Neurocranium
• Base of skull
• Middle ear
• Jaw
• Throat

Cerebral Hemisphere
Cerebellum
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Major features of the skull

• Mastoid process
• Styloid process
• External auditory/
• acoustic meatus
• (ear opening)
• Ear drum
• Hyoid bone
• Epiglottis
• Thryroid cartilage
• Cricoid cartilage
• Tracheal rings

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MM, Fig. 7.3
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Major features of the skull

• Zygomatic arch
• Ethmoid
• Orbit
• Nasal aperture
• (choanae inside)

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MM, Fig. 7.2
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Base of the skulla developmental view

• Dermal bones in neurocranium
• Chondral bone
• at base of skull
• Olfactory capsule
• (part of ethmoid)
• Optic capsule
• (part of sphenoid)
• Otic capsule
• (part of temporal
• Occipital bone
• (from somites
• like C-verts)

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Base of the skullcranial nerves out

• Ethmoid (olfactory)
• I. Olfactory
• Sphenoid (optic)
• II. Optic
• III. Oculomotor
• IV. Trochlear
• VI. Abducens
• Temporal (otic)
• VIII. Acoustic/Auditory/
• Vestibulocochlear
• Face/Jaws
• V. Trigeminal
• VII. Facial
• Throat (rest of body)
• IX Glossopharyngeal
• X. Vagus
• XI. Spinal Accessory
• XII. Hypoglosal

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Whats ahead?

• Throat (pharynx) targets Head/Neck II
• Special Sensory targets Head/Neck III
• Back to cranial nerves Head/Neck IV