Axial Skeleton Structures Flashcards
axial skeleton consists of
- skull bones
- auditory ossicles
- hyoid bone (floating bone)
- vertebral column
- thoracic cage
axial skeleton functions
- support framework
- protection for sense organs
- attachment for muscles of the head, neck and trunk
3 divisions of the skull
- facial
- cranial
- associated bones
facial bones
- maxillae
- palatine bones
- nasal bones
- inferior nasal conchae
- zygomatic bones
- lacrimal bones
- vomer
- mandible
associated bones
- hyoid bone
- auditory ossicles (in the temporal bone)
cranium bones
- occipital bone
- parietal bones
- frontal bone
- temporal bones
- sphenoid
- ethmoid
auditory ossicles (MIS)
- malleus
- incus
- stapes
lambdoid suture
suture between the occipital and parietal bones
sagittal suture
suture separating left and right parietal bones
external occipital protuberance
protruding region of the occipital bone
occipital bone
lower bone of skull
mastoid process
neck muscles attach here
external acoustic meatus
channel of the ear
zygomatic process of the temporal bone
protrusion extending from the temporal bone towards the zygomatic process
styloid process
sharp protrusion coming from the bottom of the skull. attaches and facilitates movement of the skeletal muscles of the tongue
temporal process of the zygomatic bone
protrusion extending from the zygomatic bone pointing towards the temporal bone
supra-orbital foramen
foramen found on the frontal bone above the orbital cavity
nasal bone
paired bones found at the apex of the nasal cavity
maxilla bone
one of the major skull bones, it forms the upper jaw
mandible bone
lower jaw, connected to the rest of the skull via mandibular fossa
infra-orbital foramen
opening present on the maxillae, it is below the orbital cavity
ethmoid
internal bone structure found interiorly to the skull, it borders the lacrimal bone and can be seen through the eye socket
inferior orbital fissure
opening inferior to the superior orbital fissure, can be seen in the eye socket
middle nasal concha
found in the nasal cavity and is above the inferior nasal concha
perpendicular plate of ethmoid
found in the nasal cavity, it forms the septum of the nose
superior orbital fissure
orbital fissure that’s above the inferior orbital fissure, it can be seen through the orbital cavity
-oculomotor (CN III)
-trochlear (CN IV)
-trigeminal nerve (CN V)
nasal cavity
large opening on the anterior of the skull, it contains the vomer, perpendicular plate of the ethmoid, middle and inferior nasal concha
vomer
horizontal forward facing plate, and supports the structure of the nasal passages
nasal concha
these are protruding shelves of the nose that support the turbinates which warm and humidify air
eye socket
contains …
1. optic canal
2. superior orbital fissure
3. inferior orbital fissure
4. ethmoid and lacrimal bones
optic canal
this transmits the optic nerve
lacrimal bones
supports the nasolacrimal duct which drains tears
foramen magnum
largest foramen of the skull, the lower brainstem passes through (medulla)
occipital condyles
rests on the atlas and axis cervical vertebrae, assists in the movement of the head
condyloid fossa
receives the posterior protrusion of the atlas vertebrae
condyloid foramen
center of the condyloid fossa
obturator foramen
largest foramen in the body, between the pubis and ischium
atlanto-axial joint
shake head no
atlanto-occipital
nod head yes
palatine process of the maxilla
the roof of the mouth
palatine bone
forms the hard palate
greater palatine foramen
allowed the greater palatine nerve to pass through
lesser palatine foramen
innervation to the soft palate
incisive fossa
bony depression at the front of the maxilla behind the teeth, contains the incisive foramen
incisive foramen
opening for the nerves and vessels that innervate the palate
internal nares
opening of the nasal cavity into the pharynx
foramen lacerum
carotid canal
passage of the carotid artery, next to the foramen lacerum
foramen ovale
part of the ROS acronym
-rotundum, ovale, spinosum
foramen spinosum
part of the ROS acronym
-rotundum, ovale, spinosum