The Skull Flashcards
What is the red part of the skull called?
Neurocranium
What is the blue part of the skull called?
Viscerocranium or facia bones
What is the viscerocranium also known as?
Facial bones
What is the neurocranium?
The bony case of the brain
What is the viscerocranium?
The facial bones
What is the skull made up of?
(2)
Neurocranium and viscerocranium
Label the skull:
What are the features of the frontal bone?
(2)
It’s unpaired in adults
It’s a flat bone
What does the frontal bone articulate with?
(2)
The parietal bones at the coronal suture
The zygomatic bone to form the frontozygomatic suture
Which bone in the skull is this?
Frontal bone
What are the features of the parietal bones?
(3)
They’re right and left parietal bones
They’re flat bones
They have superior and inferior temporal lines
Which bones in the skull is this?
Parietal bones
What do the parietal bones articulate with?
(4)
The sagittal border of the opposite parietal bone to form the sagittal suture
The frontal bone to form part of the coronal suture
The occipital bone to form part of the lambdoid suture
Sphenoid and temporal bones to form the squamosal suture
What are the features of the temporal bones?
(2)
They’re right and left temporal bones
They’re irregular bones (oddly shaped)
What do the temporal bones articulate with?
(4)
The mandibular fossa with the head of the mandible to form the temporomandibular joint
The squamous part with the parietal bones to form the squamosal suture
The occipital bones to form part of the lambdoid suture
The zygomatic bone
Which bones in the skull is this?
Temporal bones
What are are all the temporal bones?
(6)
Zygomatic process
Articular tubercle
External acoustic opening
Styloid process
Mastoid process
Mandibular fossa
What does the zygomatic process do?
The zygomatic bone
What does the external acoustic opening do?
It allows sound waves to reach the tympanic membrane
What does the styloid process do?
It allows for the attachment for muscles and ligaments of the tongue and neck
What does the mastoid process do?
It allows for the attachment for sternocleidomastoid muscle, and contains mastoid air cells
What does the mandibular fossa do?
It articulates with the condyle of mandible (TMJ)
Label the temporal bones:
How many pairs of auditory ossicles are there in the skull?
3 pairs
What are the 3 pairs of auditory ossicles called?
Malleus (attaches to tympanic membrane)
Incus (middle)
Stapes (internal)
What are the features of the occipital bone?
(4)
It’s a flat bone
They’re irregular bones (oddly shaped)
It has occipital condyles
It has an external occipital protuberance
What does the external occipital protuberance do?
It’s the attachment site for the trapezius muscle
What do the occipital condyles do?
They articulate with C1 (atlas)
Which bone in the skull is this?
Occipital bone
What are the foramens also known as?
Canals
Label the foramens/canals in the skull:
Label the foramens/canals in the skull:
What part of the skull is this?
Foramens/canals
Label the sphenoid bone:
What are the features of the ethmoid bone?
(2)
It’s an irregular bone
It plays an important role in the structure of the nasal cavity
What are the bones in the skull?
(6)
Frontal bone
Parietal bones
Temporal bone
Occipital bone
Sphenoid bones
Ethmoid bones
What are sutures?
Immoveable, fibrous joints
What are the 3 types of sutures?
Coronal suture
Sagittal suture
Lambdoidal suture
Label the sutures:
Label the sutures:
What is the fontanelle?
They’re soft spots between the bones of the skull where bone formation isn’t complete
When does the anterior fontanelle and the posterior fontanelle close?
The posterior fontanelle usually closes first, within 2 months of birth. The anterior fontanelle closes between 7-18 months and
What structure is found in a newborn skull?
The fontanelle
Label a newborn skull:
What are paranasal sinuses?
Air filled spaces
What are the 4 paranasal sinuses?
Frontal
Ethmoid
Sphenoid
Maxillary
Label the paranasal sinuses:
What are the functions of the paranasal sinuses?
(4)
Lightening the weight of the head
Supporting immune defence of the nasal cavity
Humidifying inspired air
Increasing resonance of the voice
