Skull Flashcards
An interparietal suture
sagittal
A suture between the frontal and two parietal bones
coronal
A suture between the occipital and two parietal bones
lambdoidal
A suture between the temporal and parietal bones
squamosal
Junction of sagittal and coronal sutures
bregma
Junction of sagittal and lambdoidal sutures
lambda
What is another name for the EOP?
inion (most prominent projection of the protuberance)
Junction of coronal suture, squamosal suture, and greater wing of sphenoid; weak point over meningeal artery
pterion
Describe the anterior fontanelle.
- Located at the junction of the sagittal and coronal sutures
- Becomes bregma later in development
- Closes at 18 months of age
Describe the posterior fontanelle.
- Located at the junction of lambdoidal and sagittal sutures
- Becomes lambda later in development
- Closes at 3 months of age
What are the two main parts of the skull?
- Neurocranium (cavity that surrounds/protects brain and brainstem)
- Viscerocranium (cavity that forms the anterior and lower regions of the skull)
How many nuerocranial bones are there? Name them.
8 bones
- Frontal (1)
- Parietal (2)
- Temporal (2)
- Occipital (1)
- Sphenoid (1)
- Ethmoid (1)
How many viscerocranial bones are there? Name them.
14 bones
- Nasal (2)
- Lacrimal (2)
- Palatine (2)
- Inferior nasal concha (2)
- Maxilla (2)
- Zygomatic (2)
- Mandible (1)
- Vomer (1)
What are the are the pits on the internal aspect of the parietal bones, near the sagittal suture, formed by arachnoid granulations?
granular fovea
What are the four parts of the temporal bones?
- Squamous: broad, flat surface; includes zygomatic process
- Petrous: dense bone; includes middle and inner ear
- Tympanic: middle portion; includes external auditory meatus and styloid process
- Mastoid: spongy bone containing air cells; includes mastoid process, the attachment for SCM
What is the difference between the maxilla and mandible?
Maxilla is upper jaw and mandible is lower jaw
Which two bones form the jugular foramen?
temporal bone (petrous portion) and occipital bone
Which part of the frontal bone articulates with the zygomatic bone?
zygomatic process
What does the zygomatic bone articulate with?
- Sphenoid
- Frontal (zygomatic process)
- Temporal (zygomatic process)
- Maxilla
Which muscles attach to the medial pterygoid plate?
muscles of the pharynx
Which muscles attach to the lateral pterygoid plate?
medial and lateral pterygoid
Where are the concha located and what are their purpose?
- Superior and middle concha are part of the ethmoid bone
- Inferior concha is considered its own bone
- Purpose is to increase the surface area in nasal cavities and to warm the air coming in
Extremely thin bones surrounding air cells (sinuses)
lamina papyracea
What is the most important part of the mandible?
Mandibular foramen because it allows for passage of inferior alveolar nerve, which innervates all of the teeth of the lower jaw.
What causes cleft palate?
When maxillary bones do not meet and fuse completely at the midline.
Which part of the maxilla articulates with the frontal bone?
frontal process
What is the distinguishing feature of the palatine bones?
L-shaped
What is an important space formed by the pterygoid of sphenoid and the palatine?
pterygopalatine fossa
What is the zygomatic arch formed by?
Union of zygomatic process of temporal bone w/ temporal process of zygomatic bone
The lacrimal bones form the ______ wall of the orbit.
medial
The region where the internasal suture meets the frontal bone.
nasion
Which bone forms the inferior and posterior aspect of the bony nasal septum?
vomer
