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Approximately how many bones occur in the adult skeleton?
206
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What are the two main divisions of the skeleton?
axial & appendicular
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What are the three main components of the axial skeleton?
skull, vertebral column, & rib cage
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What are the two main divisions of the skull?
cranium & face
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What is the bone of the forehead?
frontal bone
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What cavities hold the eyeballs?
orbits
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What two large openings lie within these cavities?
superior & inferior orbital fissures
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What is a synonym for the brow ridges?
superciliary ridge
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What bones form the bridge of the nose?
nasal bones
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What bones form the upper jaw, the lateral walls of the nasal cavity, and teh floor of the orbits?
maxillae
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What cavities lie within the maxillary bones inferior to the orbits?
maxillary sinuses
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What bone forms the lower jaw?
mandible
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What prominence on it forms the chin?
mental protuberance
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What is the cavity of the nose?
nasal cavity
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What prominence marks this cavity's anterior, inferior border?
anterior nasal spine
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What structure divides the nasal cavity into right and left halves?
nasal septum
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What scroll-shaped bones are visible on the inferior lateral walls of this cavity?
turbinate bones
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What four bones can be seen in a superior view of the skull?
frontal bone, both parietal bones, & occiptal bones
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What articulation between three of the four bones visible from a superior view of the skull occurs anteriorly in a frontal plane?
coronal suture
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What articulation can be seen running along the midline in a superior view of the skull?
saggital suture
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What openings can be seen along the posterior one-third of the sagittal suture?
parietal foramina
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What articulation can be seen posteriorly in a frontal plane between three of the four bones visible from a superior view of the skull?
lambdoidal suture
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What five bones can be seen in a posterior view of the skull?
occipital, parietal, & temporal
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What is the bump on the midline on the posterior side of the skull?
external occipital protuberance
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What are variable bones that commonly occur in the lambdoidal suture and occasionally in other articulations within the skull?
sutural bones
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What arch of bone can be seen in a lateral view of the skull?
zygomatic arch
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What movable articulation can be palpated just anterior to the external auditory canal?
temporomandibular joint
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What bump of bone occurs posterior to the ear?
mastoid process
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What sinuses can be seen in a midsagittal view of the skull?
frontal & sphenoidal sinuses
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What structures can be seen in a midsagittal view of the skull as they form the nasal septum?
vomer & perpendicular plate of the ethmoid
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What bone separates the cranial cavity and the nasal cavity?
ethmoid
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What two bones form the hard palate?
maxilla & palatine bones
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In an inferior view of the skull what flat, wing-like structures of the sphenoid can be seen?
pterygoid processes & internal nares
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What openings into the nasal cavity can be seen in an inferior view of the skull?
choanae
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Through what opening of the skull does the mandibular division of the trigeminal nerve pass?
foramen ovale
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At what opening of the skull does the internal jugular vein begin?
jugular foramen
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Through what opening in the skull does the internal carotid artery pass?
carotid canal
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Through what opening in the skull does the spinal cord pass?
foramen magnum
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With what smooth, rounded structures of the skull does the atlas articulate?
occipital condyles
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What bone forms the anterior floor of the cranial cavity?
ethmoid bone
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Through what portion of the ethmoid does the olfactory nerve pass?
cribriform foramina
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What portions of the sphenoid extend laterally from the body of the sphenoid?
ethmoidal labrynths
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What bone of the skull encases the ear?
external acoustic meatus
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Through what opening in the skull does the optic nerve pass?
optic canal
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Through what opening in the skull does the vestibulococchlear nerve pass?
internal acoustic meatus
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What suture extends across the superior surface of the skull along a coronal plane?
coronal suture
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What suture extends like an arc across the posterior surface of the skull?
lambdoidal suture
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What suture lies along the midline superiorly on the skull?
sagittal sutures
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What suture lies laterally between the parietal bone and temporal bone on each side?
squamosal suture
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What bones may be found within sutures?
sutural bones
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What is a synonym for "skullcap"?
calverium
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What bone forms part of the calvaria, the forehead, and the roof of the orbits?
frontal bone
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What is a synonym for the brow ridges?
superciliary arches
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What cavities lie within the frontal bone?
frontal sinus
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What part of the skull do the parietal bones form?
lateral walls & roof
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What part of the skull do the temporal bones form?
inferior lateral walls & part of the floor of the cranium
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What part of the temporal bone holds the middle and inner ear?
petrous region
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What opening occurs on the medial, posterior aspect of the temporal bone for blood vessels and nerves?
internal acoustic meatus
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What is the posterior region of the temporal bone?
mastoid region
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What prominence on the temporal bone lies posterior to the ear, serves as the insertion for the sternocleidomastoid, and contains air cells?
mastoid process
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What region of the temporal bone surrounds the bony, external opening of the ear?
tympanic region
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What thin point of bone on the temporal bone serves as an attachment for several hyoid and tongue muscles?
styloid process
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What opening does the facial nerve pass through on the interior surface of the skull?
stylomastoid foramen
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What opening does the internal carotid artery pass through here?
carotid canal
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What region of the temporal bone forms the superior, laterl, flat area of the bone?
squamous region
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What bony process projects anteriorly from the squamous region of the temporal bone?
zygomatic process
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What part of squamous region of the temporal bone articulates with the mandible?
mandibular fossa
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What is the opening for the ear?
external auditory canal
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What is the flat, posterior region of the occipital bone?
squamous region
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What region of the occipital bone forms the base of the cranium?
basilar region
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What is the large, circular opening within the skull for the spinal cord to pass through?
foramen magnum
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What are the smooth, rounded projections on the left and right sides of the foramen magnum?
occipital condyles
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Within the skull what is the is the opening for cranial nerve XII?
hypoglossal canal
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What superior, horizontal line projects laterally from the external occipital protuberance?
superior nuchal line
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What is the thick, medial part of the sphenoid?
body
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What cavities lie within the sphenoid?
sphenoidal sinus
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What projections of the sphenoid lie superior to the superior orbital fissure?
lesser wings
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What projections of the sphenoid lie inferior to the superiof orbital fissure and can be seen in a lateral view of the skull?
greater wings
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Whithin the sphenoid what is the depression holding the pituitary gland?
hypophyseal fossa
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What is the bony enclosure of the hypophyseal fossa?
sella turcica
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Through what opening of the sphenoid does the optic nerve pass?
optic foramen
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What three foramina penetrate the greater wings of the sphenoid?
foramen rotundum, foramen ovale, & foramen spinosum
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What projections of the sphenoid provide attachment surfaces for some muscles that move the lower jaw and soft palate?
medial & lateral pterygoid processes
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What is the superior, midsagittal elevation of the ethmoid?
crista galli
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What horizontal structure of the ethmoid separates the cranial and nasal cavities?
cribriform plate
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Through what openings do the olfactory nerves pass?
cribriform foramina
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What parts of the ethmoid hold the ethmoidal sinuses?
lateral masses
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What are the cavities within the ethmoid?
ethmoidal sinuses
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What part of the ethmoid forms the medial wall of the orbits?
orbital plate
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What scroll-like extensions of the ethmoid project medially into the nasal cavity?
superior & middle nasal conchae
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List the three crainial fossae.
anterior, middle, & posterior
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What is a synonym for the zygomatic bones?
cheek bones
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What bony projections of the zygomatic bones contribute to the zygomatic arches?
temporal process
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In addition to the temporal process, what other two processes articulate the zygomatic bone with surrounding bones?
maxillary & frontal process
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Where are the lacrimal bones located?
medial & anterior orbital wall
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Within the lacrimal bone what structure allows the passage of the nasolacrimal duct?
lacrimal groove
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The nasal bones form what facial feature?
bridge of the nose
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The vomer helps to form what structure within the nasal cavity?
nasal septum
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List the three nasal conchae found on each side of the nasal cavity.
superior, middle, & inferior
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What is a synonym for the nasal conchae?
turbinate bones
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What is the overall shape of the palatines?
L-shaped
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What portion of the palatines forms the posterior third of the hard palatte?
horizontal plate
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What part of the palatine forms the posterior, lateral wall of the nasal cavity?
perpendicular plate
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What part of the palatine forms a small part of the floor of the orbit?
orbital process
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What part of the maxilla forms the floor of the orbit?
orbital surface
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What opening within the maxilla do the infraorbital artery and nerve pass through?
infraorbital foramen
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What part of the maxilla holds the upper teeth?
alveolar process
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What part of the maxilla forms the anterior two-thrids of the hard palette?
palatine process
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What large cavity lies within the maxilla?
maxillary sinus
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What is the horizontal portion of the mandible?
body
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What are the ascending, posterior regions of the mandible?
rami
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What part of the mandible holds the lower teeth?
alveolar process
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What are the two corners of the mandible?
angle of the mandible
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What opening lies on the anterolateral surface of the body of the mandible?
mental foramen
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What opening within the mandible lies on the posterior, medial side?
mandibular foramen
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What process of the mandible articulates with the temporal bone?
condyloid process
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What is the smooth, round portion of this process?
mandibular condyle
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What is the joing between the mandible and the temporal bone?
temporomandibular joint
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What process of the mandible does the temporalis insert on?
coronoid process
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What is the U-shaped depression between the two mandibular processes?
mandibular notch
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What bones make up the roof of the nasal cavity?
ethmoid - cribriform palte, frontal bone, & sphenoid bone
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What bones make up the floor of the nasal cavity?
maxilla & palatine
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List the groups of paranasal sinuses.
ethmoid, frontal, maxillary, & sphenoidal
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What is the collective term for the tiny bones of the middle ear?
ear ossicles
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List the ear ossicles from lateral to medial.
malleus, incus, & stapes
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What small, U-shaped bone lies superior to the larynx?
hyoid bone
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What is the anatomical term for the softspots in a baby's skull?
fontanels
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What is the function of the fontanelles?
birth & growth
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List the four fontanels.
anterior, posterior, sphenoid, & mastoid
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