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The skull AP1

The most complex part of the skeleton skull
22 bones joined together by sutures skull
Number of cranial bones that surround the cranial cavity 8
Number of facial bones support teeth, facial, and jaw muscles 14
2 types of bones in skull and number of each 14 facial and 8 cranial
Only moveable facial bone mandible
Name 4 paranasal sinuses frontal, sphenoid, ethmoid, and maxillary
Lines mucous membrane and air-filled paranasal sinuses
Lighten the anterior portion of skull paranasal sinuses
Acts as chamber that adds resonance to the voice paranasal sinuses
Lighten skull, provide resonance to the voice, assist in arming and humidifying the air that we breathe paranasal sinuses
Largest paranasal sinus maxillary
Cranial fossa consists of what two parts? cranium and base
Protects the brain and associated sense organs cranium
Consists of two parts: the calvaria and the cranial base cranium
Two parts of cranium calvaria and cranial base
Three basins of the Base of cranial fossa anterior cranial fossa, middle cranial fossa, and posterior cranial fossa
Forms forehead and part of the roof of the cranium frontal bone
Posterior boundary of frontal bone coronal suture
Forms roof of the orbit supraorbital margin
Provides passage for nerve, artery, and vein supraorbital foramen
Smooth area above roof of the nose glabella
Contains the frontal sinuses glabella
Form most of cranial roof and part of its lateral walls parietal bones
Bone bordered by 4 sutures parietal bone
4 sutures that border parietal bone sagittal, coronal, lambdoid, and squamous
serves as attachments of the terporalis muscle of the parietal bone two temporal lines
lateral wall and part of floor of cranial cavity temporal bones
encircled by squamous suture squamous part of temporal bones
rear and base of skull occipital bone
foramen magnum holds what? spinal cord
skull rests on ? atlas
where does the skull articulate with the atlas? Occipital condyles
largest foramen in skull foramen magnum
hyaline cartilage -> bone endochondral ossification
fetal skeleton is made of ? hyaline cartilage
All bones inferior to skull EXCEPT WHAT undergo E.O.? clavicles
Chondrocytes mature cartilage cells
True or False? Chondrocytes undergo mitosis true
Enlarge and calcify to form tribiculae chondrocytes
Growth plate (in infants only) epiphyseal plate
Where bones form joints with other bones; where tendons, ligaments, & muscles attach,; and where blood vessels and nerves have passed sutures
Parts of the sphenoid bone greater wing, lesser wing, and body
Contributes to medial wall of eye orbit; lateral walls and roof of nasal cavity and nasal septum; internal between eyes ethmoid bone
Three major portions of the ethmoid bone perpendicular plate, cribform plate, and labyrinth
Forms superior two-thirds of nasal septum (top) perpendicular plate
Forms roof of nasal cavity (bottom) cribform plate
Attachment point of meninges crista galli
Large mass on each side of perpendicular plate labyrinth
How many facial bones? 14
Facial bones are made up of what bones? 2 nasal bones, 2 maxillae, 2 zygomatic bones, 2 mandible, 2 lacrimal bones, 2 palatine bones, 2 inferior nasal conchae, and 1 vomer
Forms bridge of nose, supports cartilage that shape lower portions of nose and often fractured by a blow to the nose nasal bone
Largest facial bone maxillary
Forms upper jaw and meet each other at the median maxillary bones
Boney points in between teeth aveolar process
Socket that holds teeth alveolus
Forms most of the hard palate maxillary bones
Forms the roof of the mouth and floor of nasal cavity palate
Larger in volume than frontal, sphenoid, and ethmoid sinuses maxillary sinus
Forms angle of the cheekbones and part of the lateral orbital walls zygomatic bones
Formed from temporal process of zygomatic bone and zygomatic process of temporal bone zygomatic arch
Strongest bone of the skull mandible
Only bone of skull that moves noticeably mandible
Supports lower teeth mandible
Provides attachments for muscles of facial expressions and mastication (chewing) mandible
Median cartilaginous joint in the fetus mental symphysis
Develops as two separate bones in fetus and ossifies in early childhood mental symphysis
Point of chin mental protuberance
Body of this bone supports teeth mandible
Ramus of mandible articulates with ? cranium
Where body and ramus meet angle of mandible
Bears the mandibular condyle condylar process
Oval knob that articulates with the mandibular fossa of the temporal bone forming the hinge temporomandibular joint mandibular condyle
Process of insertion of temporalis muscle coronoid process
Parts of mandible condylar process, coronoid process, mandibular notch, and mandibular foramen
Forms part of the medial wall of each orbit lacrimal bones
Smallest bone of skull lacrimal bones
Houses lacrimal sac in life lacrimal fossa
Tears collect HERE and drain into nasal cavity lacrimal sac
L-shaped bones palatine bones
Forms the posterior portion of the hard palate (part of the lateral nasal cavity wall and part of the orbital floor) palatine bones
Largest of the three conchae in the nasal cavity inferior nasal conchae
Superior and middle conchae are part of the ____ ethmoid bone
Inferior half of the nasal septum vomer
Superior half formed by perpendicular plate of ethmoid vomer
Supports cartilage that forms the anterior part of the nasal septum vomer
7 bones of eye orbit ethmoid, palatine, frontal , sphenoid bone, mailla, zygomatic bone, lacrimal bone
Only unarticulated bone hyoid bone
Three bones in each middle ear (auditory ossicles) malleus (hammer), incus (anvil), stapes (stirrup)
Smallest bone of ear stapes
Slender u-shaped bone between the chin and larynx hyoid
What bone signals evidence of strangulation if fractured? hyoid
Space between unfused bones fontanels
Filled with fibrous membrane; allows shifting of bones during birth and growth of brain fontanels
6 fontanels in infant skull anterior, posterior, 2 sphenoid, and 2 mastoidal
Two frontal bones fuse by age 6 causing what suture? metopic suture
What age does the skull reach adult size? 8 or 9 years of age
Created by: Lisa Hall



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