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Skull Anatomy L1

Skull anatomy lecture 1

The sutures of the skull are classified as_______and allow____movement synarthroidal,no
The bones of the cranium form by_____while the facial forms by_____ interosseous, endochondrial
Bones of the skull begin as rod-like groups of cells called notochord
this allows the head to overlap during child birth fontanelles
fontanellesare replaced as bone and eventually form_______ sutures
The two primary fontanelles are____&_____ Anterior/Bregma and Posterior/Lambda
How many bones form the cranium/calvarium/cranial cavity 8 bones
How many bones form the facial/Visceral skeleton 14 bones
hydrocephalus frontanelle bulge from increased fluid
4 bones that are classified as flat bones frontal bones, 2 parietal bones, and occipital bones
The three layers that form the flat bones are outer/compact, middle/cancellous(diploe), inner/compact
middle layer of flat bone diploe
Meningeal grooves inner surface of flat bone forming the cranium, narrow branch-like grooves
Sulci large channels or ditches which lodge blood vessels
Irregular Bones cranial bones include sphenoid(butterfly), ethmoid(little projection), 2 temporal bones(project off wings of butterfly)
List the 8 bones that form the Carium frontal, ethmoid, 2 parietal, 2 temporal, occipital, sphenoid
frontal bone location forehead
ethmoid bone location in superior nasal cavity
2 parietal bone locations lateral superior sides of cranium
occipital bone location posterior base of skull
sphenoid bone location anterior and middle section of base of skull
Which 4 bones form the base of the skull occipital, sphenoid, 2 temporal bones
what are all the names for the skull brain case/ cranial cavity/ calvarian/ cranium
what are all the names for the facial skeleton facial skeleton/ visceral skeleton
name the 14 bones which for the facial skeleton 2 maxillary, 2 lacrimal, 2 nasal, 2 zygomatic, 2 inferior nasal conache, 2 palatines, manidible and vomer
location of 2 maxillary bones upper jaw and nasal/lower cheek area)
location of lacrimals inside of eye/tear duct
location of nasal bones on top of nose
location of zygomatic cheek bones
2 inferior nasal conaches curly cue-scrolls inferior aspect nasal cavity
2 palatines upper roof of mout, superoposterior portion of hard palate in oral cavity and portions of posterior nasal and orbital cavities
mandible lower jaw
vomer location divides nose into two chambers
wherever maxilla goes....______goes. they are the only bones that form the oro,naso,orbital cavity palatine goes
hyoid bone extends off from______ of the _____bone styloid process, temporal
The MIDDLE ear, the auditory ossicles which is part of the_____bone temporal
3 auditory ossicles in each ear are malleus(hammer), Incus(anvil), Stapes(stirrup)
Name the 5 regions/house of the skull frontal/anterior, lateral walls, roof/vortex, posterior wall, base/floor
which bones form the roof/vortex frontal and parital bones
anterior wall/frontal wall formed by frontal bone
which bones form the lateral wall of cranium parital and temporal
what bone forms the posterior wall occipital
The major 4 sutures of the skull are sagittal, coronal, squamosal, lambdoidal
The 7 minor sutures include asterion, pterion, frontozygomatico, zygomaticotemporal, frontomaxillaris, zygomatico-maxillaris, frontonasal
What is the densest structure of the skull and this is the largest fifference in skull shape/type the Petrous Ridges
What are the three general skull classifications Mesocephalic(caucasian), Bracheycephalic(asian) Dolichocephailc(african)
Mesocephailc is __cm at it widest point, __cm at its longest point and__cm at its deepest 15cm, 19cm, 23 cm
The angle of the Petrous Ridges on Mesocephailc 45-47 MSP degrees
Describe the Brachycephalic and angle short front to back, wide side to side, MSP 54 degrees
Describe the Dolichocephalic Skull narrow, internal structure lower, denser skull so small increase in exp. factors. 40 degrees MSP
The petrous ridges lie at the level of top of ear attachment
smooth rounded prominence between eyebrows Glabella
junction of the nose and upper lip Acanthion
bridge of nose, where nasal bone articulates with the frontal bone Nasion
ridge of bone covered by the eyebrow superciliary arch
bump of knowledge INION,bump on posterior surface of occipital bone also called External Occipital Protuberance, Bump of Knowledge and Inion
Angle of the Mandible Gonion(where horizontal portion of mandible ascends vertically)
Bump on the temporal bone posterior to EAM Mastoid Process
Bumpin the center of te chin mental point
Lateral junction of the eyelids outer canthus
medial junction of the eyelids inner canthus
cartiliginous flap of ear auricle/pinna
external opening to the ear EAM external auditory meatus
TEA top of ear attachment
Lip like structure in from of EAM tragus
Superior rim of orbit supraorbital margin
Inferior rim of orbit infraorbital margin
line connecting Acanthion and EAM Acanthiomeatal line
line connecting Glabella and EAM Glabellomeatal line
there is a __degree difference between the orbitomeatal line(OML) and the Glabellomeatal line 8 degree, know cuz some patients cant tip their head down
Line connecting the pupils of the eye Interpupillary line ( level of Nasion)
Radiographic Baseline_____(we use this the most)Also referred to as_____ Infraorbitalmeatal line (IOML) Reids Baseline
Line form the outer canthus of the eye to the EAM___also referred to as ____also as_____ orbitomeatal line/radiographic baseline/ canthomeatal line
there is a __degree difference between the orbitomeatal line and infraorbitomeatal line 7 degree difference
What are the two portions of the frontal bone Squamous/vertical portion:forehead Horizontal:roof of the orbits
Two rounded elevations on external bone on either side of MSP frontal eminences
ridge of bone that corresponds to position of eyebrows supercilliary arch
ridge of bone that forms the superior rim of orbits SOM supraorbital margin
opening for nerves and arteries in frontal bone supraorbital notch/foramen
small pointed process which articulates w/ethmoid to help form a small portion of the Bony Nasal Septum Nsal Spine
Small lateral processes at outer rim of superior orbit which articulate w/ the Zygoma Zygomatic proccesses
Depressions above the supercilliary arches supraorbital groove
Frontal Sinuses are located one on either side of the MSP, creating a sinus cavity in the vertical/squamous portion of the frontal bone
Thin plates of bone which form the superior/roof of each orbit of the frotal bone Orbital/Horizontal Plates
The space between the Orbital Plates of the Frontal Bone is called the Ethmoid notch
Sponge like, cube shaped bone between two orbits Ethmoid
Four portions of Ethmoid are Cribiform Plate, Perpendicular Plate, LAteral masses/Labyrnths, Nasal Conchae
The perforated portion of Ethmoid for transmission of the Olfactory nerves is called the Cribiform Plate
The two vertical projections on the Ethmoid are Cribiform and Peroendicular Plate
A superior vertical projection on cribiform which resembles a roosters comb is ___, this is an attachment site for____ Crista Galli, Flax Cerebri(fold of dura mater)
On the either side of Cribiform plate, forms the medial walls of the orbit and lateral walls of the nasal cavity Lateral masses/labyrinths
The Etmoid Sinuses are located in the Lateral Masses/Labyrinths
Scroll like processes on the walls of the lateral masses nasal concahes
Nasal conchaes are collectively called Turbinates
The purpose of the Turbinates is to warm/filter external air
The_____of the_____and the_____ form the bony nasal septum perpendicular plate, ethmoid, vomer
The widest portion of the skul lies between Parietal Eminences
Parietal Bones 2 square shaped bones, forms the posterior and and superior roof of the cranium
The two parietal bones join together to form the sagittal suture
Rounded bumps on lateral aspect of each parietal bone parietal eminence
List the four borders of the parietal bones sagittal border, frontal border, occipital border, squamous border
List the four angles of the Parietal Bones Bregma-Frontal Angle(sag meets coronal suture), Lambda-Occipital Angle(sag meets lambdoidal suture), Mastoid Angle(parietals meet mastoid portion of temp. bone), Sphenoid Angle(parietals meet greater wing of sphenoid)
Inner surface of parietal bone is concave and has small grooves called____which are for_____ meningeal grooves, meninggeal vessels
Pacchionian Bodies are depressions for arachnoid granulations near the sagittl suture
Created by: alymadi