Week 1: Lecture 2 - The Skull Flashcards
How many bones are there in the skull?
22
What are the bones in the skull connected by?
fibrous sutures
-a suture is a joint that is non moveable
which is the only joint in the skull that is moveable?
The temporomandibular joint in the cranial cavity of the brain
Which bones form the surroundings of the orbital cavity?
Roof - frontal bone Lateral walls - Zygomatic bones Medial - lacrimal bone and ethmoid bone Floor - maxilla bones Posterior wall - sphenoid bone
Which suture connects the parietal bones?
sagittal suture
Which suture joints the frontal bone to both parietal bones?
coronal suture
Which bone is the ‘cheek’ bone?
zygomatic bones
Which bones are in the nasal cavity?
- ethmoid bone
- vomer bone
- inferior nasal concha
Which part of the ethmoid bone connects to the vomer?
middle process of ethmoid
How is the shape of the sphenoid bone usually described?
butterfly shape
Which 5 bones in the skull are not paired?
- frontal bone
- ethmoid bone
- vomer
- mandible
- sphenoid
Which 7 bones in the skull are paired?
- parietal
- nasal
- temporal
- zygomatic
- lacrimal
- maxillary
- inferior nasal concha
Which 4 paranasal sinuses do we have?
- frontal sinuses
- ethmoidal sinuses
- maxillary sinuses
- sphenoid sinuses
all found where the corresponding bones are
What are the functions of the paranasal sinuses?
- lighten the weight of the skull
- filter and humidify air
- resonate voice
- drain fluid into specific channels in the nasal cavity called meatuses
Which concha are found in the ethmoid bone?
superior and middle concha
What are meatuses?
channels underneath the concha
paranasal sinuses drain fluid into these spaces
Which gland sits on the sphenoid bone?
pituitary gland
Which sinuses drain into the superior meatus? (SES)
SES -
Sphenoid sinus and ethmoidal air cells drain into superior meatus
Which sinuses drain into the middle meatus? (MFM)
MFM-
Maxillary and frontal sinus drain into middle meatus
What drains into the inferior meatus?
nasal lacrimal duct - bringing tears to our nasal cavity when we cry
Where is the mastoid process?
Protrusion in the posterior temporal lobe
-so called because its breast shaped
Which sharp and pointy projection is found anterior to the mastoid process?
styloid process
-so called because it resembles a pen
What does the external auditory canal/ tube do? What membrane is it covered with?
- connects external ear to middle ear
- covered by tympanic membrane
What connects the temporal bone to zygomatic bone?
zygomatic process
