Anatomy Midterm 2 - Lecture 6.docx

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Michele Barbeau

Osteology of the Skull ­ inferior surface ­ maxilla o forming face, but also form part of the hard palate o other part of the hard palate is formed by the palatine bone o when they fail to fuse, called a cleft palate ­ zygomatic bone o temporal process  projection toward another bone  named because of the bone its going toward ­ temporal bone o zygomatic process  named because of the bone its going toward ­ ­ some cases the lip is involved ­ what is below here is the oral cavity ­ and above it is the nasal cavity ­ oral cavity becomes opened to the nasal cavity o when the hard palate fails to form ­ eating is a problem, goes into the nasal cavity ­ correctable though ­ ­ jaw bone (mandible) ­ vertical part is called the ramus ­ sharp curve at mandibular angle ­ and body of mandible ­ mandibular condyle o end part of bone that articulates with other structures o articulates with part of temporal bone o mandibular fossa – part of temporal bone o at temporal­mandibular joint (TMJ) o articulate so you can open and close your jaw ­ large process called the coronoid process o where muscles attach ­ two foramen o mandibular foramen  medial surface of mandible o mental foramen  where nerve enters mandibular foramen, and passes through  mandibular canal and enters all the teeth  and part of it emerges to mental foramen and supplies chin sensory  trigeminal nerve (III division) ­ ­ maxilla  ­ contribution to zygomatic arch – zygomatic process ­ frontal process o articulates with frontal bone ­ infraorbital opening o maxillary (II) division of trigeminal nerve o goes to cheeks ­ forms part of nasal cavity ­ and floor of orbit (eye socket) ­ and holds maxillary teeth ­ empty space is continuous with nasal cavity o adds resonance to voice, makes skull lighter, and warms air o has large sinus within it ­ sinus infection – maxillary sinus is the most infected ­ articulates with mandible at TMJ ­ four distinct regions o squamous part  flat, elongated  very thin  almost transpartent o tempanic region  external acoustic meatus • ear canal o mastoid region  mastoid process • behind ear, rounded bump o styloid process  looks like pen  quite fragile  at bottom  muscles of pharynx attach o petrous part  within cc o zygomatic process – toward zygomatic bone ­ squamous part ­ petrous part o very thick o dense o within, have structures of inner ear  cochlea  vestibular apparatus – balance, proprioception o internal acoustic meatus  vestibular cochlear nerve  and facial nerve  both pass through ­ frontal bone ­ maxilla ­ zygomatic ­ lacrimal ­ sphenoid  ­ ethnoid ­ palatine ­ roof o frontal bone o specialized area of frontal bone called orbital plate o sphenoid bone ­ back o sphenoid bone o ethmoid bone  also contributes to nasal cavity o maxilla
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