the skull and facial bones part 1 Flashcards
meninges
refers to membranous coverings of brain and spinal cord
how many layers of the meninges are there and what are they called
-3
- dura mater
- arachnoid mater
- pia mater
name the 8 cranial bones that can be seen via lateral view
- frontal
- parietal x2
- occipital
- temporal x2
- sphenoid
- ethmoid
what bone can only be seen via PA view
occipital bone
name the 2 facial bones
- maxilla
- mandible
what is the mandible
the movable part of the jaw
name the two bones of the nasal septum (AP view)
- vomer
- perpendicular plate of ethmoid bone
what are round holes through a bone referred to as
foramen
foramen magnum
- a large hole in base of skull that the spinal cord passes through
- slightly posterior to centre
what suture unites left and right frontal bones after birth
metopic suture
what do 2 parietal bones form?
- greater portion of sides
- roof of cranial cavity
what are the functions of parietal bones?
- cover centre of the skull
- protect right and left parietal lobes of brain
- helps shape head
name the sutures of parietal bones and when they close
- sagittal suture - 22yrs
- coronal suture - 24yrs
- squamous suture - 60yrs
what do paired temporal bones form
- the inferior lateral aspects of cranium
- part of cranial floor
functions of temporal bones
- house structures of ears
- crossed by majority of cranial nerves
- first region to show signs of ageing
location of occipital bone
- back of the head
- most posterior cranial bone
what does occipital bone form
- most posterior part
- most base of cranium
what is the function of the occipital bone
- protects cerebellum and occipital lobes of cerebellum
- provides attachment to several muscles and ligaments
where is the foramen magnum located
the inferior part of the occipital bone
what does key parts of sphenoid bone include
- body
- greater wing
- lesser wing
what passes through the optic foramina
optic nerves pass on their way to their brain
what does sphenoid mean
wedge
what is sella turcica
a bony depression in the sphenoid bone
what is sella turcica
a bony depression in the sphenoid bone
