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SKULL

QuestionAnswer
The skull is divided into what 2 groups? 1) Cranial bones > 8 2) Facial bones > 14
What is the inner layer of spongy bone separating two outer plates of compact tissue? Diploe
What are sutures? Fibrous joints that connect the bones of the skull.
The suture between the frontal and parietal bones? Coronal Suture
The suture on top of the head between two parietal bones? Sagittal Suture
What are the sutures between the temporal bone and parietal bones? Squamosal suture
What is the suture between the occipital and parietal bones? Lambdoidal Suture
What is the junction of the coronal and sagittal sutures? Bregma
What is the junction of the sagittal and lambdoidal sutures? Lambda
Areas of incomplete ossification in infant skulls. Fontanels "soft spots"
The cranial floor is divided into how many regions ? 3 anterior cranial fossa middle cranial fossa posterior cranial fossa
What is the name of the typical skull? Mesocephalic
What is the name of the skull that's short from front to back, broad from side to side, and shallow from vertex to base? Brachycephalic
What is the name of the skull that is long from front to back, narrow from side to side and deep from vertex to base? Dolichocephalic
What forms the forehead and the anterior part of the cranial vault? Frontal Squama (part of the frontal bone)
List the frontal bone landmarks: frontal eminences, supraorbital margins, supraciliary arches, supraorbital foramina, and the glabella
What bone consists of a horizontal plate, vertical plate and two light spongy masses(labyrinths) Ethmoid bone
Horizontal portion of the ethmoid bone is called the? cribiform plate
what contains numerous foramina for transmission of ol factory nerves? cribiform plate
What is the conical projection at anterior midline of cribiform plate? Crista Galli
what forms the superior portion of the bony nasal septum on the ethmoid bone? Perpendicular Plate
What contains ethmoid sinuses or air cells? Labyrinths
On the parietal bones what is the prominent bulge near the center of external surface of each bone? Parietal Eminence
Irregular wedge shaped bone that vaguely resembles a bat? Sphenoid bone
Sphenoid bone consists of ? Body, two lesser wings, two greater wings and two pterygoid processes.
Deep depression on superior surface of body of the spheniod bone (houses pituitary gland) Sella Turcica
Posterior border of sella? Dorsum Sellae
Slanted area of bone posterior and inferior to dorsum, and supports the pons of the brain Clivus
Opening into the apex of orbit for transmission of optic nerve and ophthalmic artery Optic Canal
What bone articulates with each of the other seven bones of the cranium and the zygoma? Sphenoid Bone
What bone is situated at the posterioinferior part of the cranium? Occipital Bone
The occipital bone has 4 parts, what are they? Squama, 2 occipital condyles, basilar portion
Large opening on the occipital bone through which the medulla oblongata passes as it exits the cranium. Foramen Magnum
Prominent process on the squama also called the inion external occipital protuberance
What projects anteriorly from each side of the squama and fuses at the basilar portion to complete foramen magnum occipital condyles
What bone is situated on each side of the cranial base Temporal Bones
What contains the organs for hearing and equilibrium and where are they found? petromastoid portion located on temporal bones
Styloid and zygomatic process are found on the ? temporal bones
What receives condyle of mandible to form temporomandibular joint? Mandibular fossa
What bone holds the tympanic portion, styloid process and the petromastoid portion? The temporal bones
Bones of the middle ear are referred to as : Auditory Ossicles
List the 3 auditory aussicles: HAMMER(malleus) ANVIL (Incus) and STIRRUP(Stapes)
How many facial bones are there? 14
What are the two smallest bones in the skill? The lacrimal bones
What is the largest most immovable bone of the face? (also forms 3/4 of the roof of your mouth) Maxillary bone
Located under each orbit for passage of infraorbital nerve and artery. Infraorbital foramen
Where is the acanthion located ? Right below the nose
What bone forms the prominence of the cheeks? Zygomatic bones
2 L -shaped bones composed of vertical and horizontal plates Palatine Bone
Long narrow, very thin bones with a lateral curl, (gives scroll like appearance) inferior nasal conchae
Upper 2 nasal conchae are processes of : The ethmoid bone.
Thin plate of bone situated in MSP of floor of nasal cavity(forms inferior nasal septum): Vomer
What is the largest and densest bone f the face? Mandible
Junction of body and ramus Angle of mandible ( also called gonion)
Where right and left halves of mandible fuse Symphysis
Consists of spongy bone that supports roots of teeth Alveolar process
Small openings on each side that transmit nerves and blood vessels Mental foramina
Posterior portion on top of ramus that helps form TMJ Condylar process
Small U - Shaped bone situated at the base of the tongue (ONLY BONE THAT DOES NOT ARTICULATE WITH ANOTHER BONE) Hyoid Bone
Each orbit consists of how many bones? 7
What bones does each orbit consist of? frontal, sphenoid, ethmoid, maxilla, zygoma, lacrimal, and palatine
Air filled cavities located in the frontal, ethmoid and sphenoid bones Paranasal Sinuses
What are the functions of paranasal sinuses? serve as a resonating chamber for the voice, decrease weight of the skull, aid in warming and moisturizing inhaled air, act as shock absorbers in trauma, possibly control the immune system
what sinuses are developed enough to be demonstrated at birth? Maxillary(largest and most symmetric)
second largest sinuses frontal sinuses
what sinuses are occasionally absent? Frontal
What sinuses are located within the lateral masses of labyrinths Ethmoid sunuses
From outer canthus to EAM Orbitomeatal line
Infraorbitomeatal Line from infraprbital margin to EAM
From glabella to EAM Glabellomeatal line
Interpupillary Line Line between pupils of eyes
Acanthiomeatal line From acanthion to EAM
Mentomeatal line Mental point to EAM
Hyposthenic patients and asthenic patients may need support at chest for what reason? To help prevent downward tilt of MSP to get a true lateral position
Hypersthenic patients may require support at head for what reason? To help prevent upward tilt of MSP to get a true lateral
Created by: Kelsey.w21