Axial Skeleton Flashcards
Occipital Bone
Posterior head, base of the skull
External occipital protuberance
The bump on the posterior side.
Occipital condyles
Articulate with the atlas
Foramen magnum
Large hole for the spinal cord to pass through
Frontal Bone
Forehead
Supraorbital margin
Ridge of bone above each eye
Supraorbital foramen
Hole above the supraorbital margin
Parietal Bones
Form part of the sidewall and roof of the cranium
Coronal suture
Junction between frontal bone and 2 parietal bones
Sagittal suture
Junction between 2 parietal bones
Squamous suture
Junction between temporal bone and parietal bones
Lambdoidal suture
Junction between 2 parietal bones and the occipital bone
Temporal Bones
Form part of the sidewall of cranium, the temple
External auditory meatus
Ear canal
Styloid process
Elongated, pin-like process on inferior side
Mastoid process
Large bony mass inferior and posterior to ear
Mandibular fossa
Articulates with the mandibular condyles on mandible
Zygomatic process
Projection of temporal bone
Sphenoid
Irregular bone on floor of cranium, looks like a “bat”
Optic foramen (canal)
Hole for the optic nerve to pass through towards each eye
Sella turcica
Saddle like structure on superior surface (pituitary gland sits here)
Greater and Lesser wings
Large and small wing like structures which help form the floor of
the cranium
Superior orbital fissure
Large slits which can be seen in the eye sockets, it is between the
greater and lesser wing
Inferior orbital fissure
Smaller slits, also seen in the eye sockets, just inferior to the
superior orbital fissures
Ethmoid
Irregular bone anterior to sphenoid and between eyes
Crista galli
Bony projection on superior surface
Cribriform plate
Horizontal plate on the superior surface that is perforated with
many small holes for the olfactory nerv
Middle nasal concha
Not a named bone, but part of the ethmoid bone. Above inferior
nasal concha
Superior nasal concha
Not a named bone, but part of the ethmoid bone. Above middle
nasal concha
Perpendicular plate
Inferior plate that divides the nasal cavity
Orbital plate
Smooth plates which form the medial walls of the eye sockets
Mandible
Lower jaw
Ramus
Vertical projection on each side
Condylar process
Rounded projections on the superior surface of the rami
Coronoid process
Flat process on the superior surface of the rami
Body
Chin area
Mandibular angle
Where body and rami meet
Mental foramen (foramina)
Hole(s) penetrates body on each side of chin
Mandibular notch
Depression that lies between the condylar and coronoid processes.
Maxilla
Upper jaw
Infraorbital foramen
Hole that penetrates the orbital rim
Zygomatic bones
Cheek bones
Nasal bones
Form bridge of nose
Lacrimal bones
Located on medial wall of eye socket
Lacrimal fossa
Deep groove on anterior/medial surface (tear duct or lacrimal
duct)
Palatine bones
Form roof of mouth and walls of nasal cavity