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skull
GA 1 Exam 4
| Question | Answer |
|---|---|
| how many bones in the skull | 22 bone (or 28 including ear ossicles) |
| between the two parietal bones | sagittal suture |
| between the frontal and parietal bones | coronal suture |
| between the parietal and occipital bones | lambdoidal suture |
| intersection of the sagittal and coronal sutures | bregma |
| intersection of the sagittal and lambdoidal sutures | lambda |
| junction of the temporal, pairetal and occipital bones | asterion |
| area where the greater wing of the sphenoid, parietal bone, squamous portion of temporal bone and frontal bone meet | pterion |
| present in the fetus usually disappears in adults | metopic (frontal) suture |
| articulation between the squamosal part of the temporal bone and the parietal bone | squamosal suture |
| site of the anterior fontanelle after closure | bregma |
| site of the posterior fontanelle after its closure | lambda |
| site if the posteriolateral fontanelle after closure | asterion |
| site of the anterolateral fontanelle after closure | pterion |
| composed of parts of the ethmoid, frontal and sphenoid bones | anterior cranial fossa |
| composed of portions of the greater wing and body of the sphenoid and temporal bones | middle cranial fossa |
| spearated by the superior ridge of the petrous portion of the temporal bone | posterior cranial fossa |
| between the frontal and parietal bones | anterior fontanelle |
| between the parietal and occipital bones | posterior fontanelle |
| the area between the frontal bone, greater wing of the sphenoid, squamosal portion of the temporal and the parietal bones on the lateral aspect of the skull | anterolateral fontanelle |
| the area between the occipital, temporal, and parietal bones on the lateral aspect of the skull | posterolateral fontanelle |
| areas of membrane between cranial bones; represents incomplete intramembranous ossification | fontanelles |
| the inside floor the the cranial cavity that is divisible into three levels | cranial fossae |
| forms the forehead and the roof of the orbit | frontal bone |
| ridges over each orbit | superciliary arches |
| smooth area in the midline between the 2 superciliary arches | glabella |
| transmits supraorbital NAV | supraorbital foramen (supraorbital notch) |
| forms a large part of the roof of the orbit | orbital process |
| sinus inferior to the glabella | frontal sinus |
| in the anterior cranial fossa, transmits an emissary vein | foramen cecum |
| curved ridge along the lateral surface where the temporal fascia attaches | superior temporal line |
| curved ridge just inferior to the superior temporal line where part of the temporalis muscles attaches | inferior temporal line |
| made up of the squamosal portion, mastoid portion, styloid process and petrous portion | temporal bone |
| flat portion of the lateral skull | squamosal portion of the temporal bone |
| houses the inner ear | petrous portion |
| transmits and emissary vein (often absent) | mastoid foramen |
| transmits most of CN VII (facial N) (on base) | stylomasoid foramen |
| transmits internal carotid artery | carotid canal |
| formed between temporal and occipital bone; tansmits internal jugular vein, CN IX (glossopharyngeal), CN X (Vagus), CN XI (spinal accessory) | jugular canal |
| formed between the temporal, sphenoid and occiptial bones. filled with cartilage in lige | foramen lacerum |
| opening of the external ear | external acoustic meatus |
| on the posterior wall of the petrous portion of the temporal bone 9inside the skull); transmits CN VII(facial n) and CN VIII (vestibulocochlear n) | internal acoustic meatus |
| transmits spinal cord, vertebral arteries, and the spinal portion of CN XI accessory n) | foramen magnum |
| on inferior surface of occipital bone, articulates with the atlas | occipital condyles |
| projection on the posterior aspect | external occipital proturberance |
| curved ridge extending laterally from the EOP | superior nuchal line |
| halfway between the foramen magnum and the EOP | inferior nuchal line |
| oblique canal that opens posterior to the condyles 9on the basal view). transmits an emissary vein (often absent) | condylar canal |
| opens anterior to the condyles on the base transmits CN XII | hypoglossal canal |
| basilar portion, anterior to the foramen magnum, fused to the slanting posterior portion of the sphenoid | clivus |
| a deep curving groove extending from the jugular foramen. venous blood from this sinus exits the skull as the internal jugular vein | sulcus for the sigmoid sinus |
| projection of the inner posterior aspect in the midline | internal occipital protuberance |
| a deep horizontal groove extending from the IOP and joining the sulcus for the sigmoid sinus | sulcus for the transverse sinus |
| includeds the body, lesser wing, greater wing and pterygoid processes | sphenoid |
| forms much of the base of the skull and part of the middle cranial fossa | body of the sphenoid |
| paried in the body of the sphenoid | sphenoid sinus |
| area on the body of the sphenoid | sella turcica |
| deep seat in the sella turcica which house the pituitary gland | hypophyseal fossa |
| forms part of the orbit, the lateral surface of the skull, and the middle cranial fossa | greater wing of the sphenoid |
| transmits the maxillary (2nd) division of the trigeminal nerve (V3). connects the middle cranial fossa and the pterygopalatine fossa | foramen rotundum |
| transmits the middle meningeal artery | foramen spinosum |
| forms portions of the orbit and anterior cranial fossa | lesser wing of the sphenoid |
| transmits the optic n (CN II) and ophthalmic artery | optic foramen (canal) |
| large space between lesser and greater wings. transmits CN III, CN IV, CN V1 and CN VI | superior orbital fissure |
| pointed projections extending over the sella turcica | anterior clinoid process |
| groove uniting the 2 optic canals | chiasmatic groove |
| downward projections from the body and greater wings on the bases of the skull | pterygoid process |
| thin plate of bone with a posterior free margin, on the medial portion of the process | medial pterygoid plate |
| hook projection from the medial plate | hamulus |
| lateral projection of the process. fuses to the maxilla inferiorly | lateral pterygoid plate |
| attaches the pterygoid process and the maxilla | pterygomaxillary fissure |
| recess medial to the fissure bounded by the palatine bone and pterygoid process (foramen rotundum opens here) | pterygopalatine fossa |
| through the base of the pterygoid process | pterygoid canal |
| roughly L-shaped; contributes to the orbit, hand palate, and lateral wall of the nasal cavity | palatine |
| articulates posteriorly with the pterygoid process and body of the sphenoid, articulates with the maxilla, forms part of the lateral wall of the nasal cavity | perpendicular plate of palatine |
| small contribution to the floor of the orbit | orbital process |
| meets opposite member in the midline forming the posterior portion of the hard palate, forms the transverse palatine suture with palatine process of maxilla, the midline suture between the two palatine bones is part of the median palatine suture | horizontal plate |
| located in the horizontal portion, transmits NAV of the same name | greater palatine foramen |
| posterior to the greater palatine foramen, often 2 on each side, transmits NAV of the same name | lesser palatine foramen |
| thin midline bone with the nasal cavity. upper anterior edge articulates iwth the perpendicular plate of the ethmoid, superiorly with the sphenoid, and inferiorly with the maxillae and palatine bones | vomer |
| forms parts of nose, orbit and anterior cranial fossa | ethmoid bone |
| midline projection in the anterior cranial fossa; falx cerebri, a sheet of dura attaches here | crista galli |
| perforated sheet of bone forming the floot of anterior cranial fossa and the narrow roof of the nasal cavity; foramina transmits filaments of CNI | cribriform plate |
| forms part of the bony nasal septum; articulates with the vomer inferiorly | perpendicular plate of the ethmoid bone |
| smooth lateral surface forms part of the medial wall of the orbit | lateral masses of ethmoid |
| small ledges or scrolls of bone which extend from the medial surface of the masses | superior, middle and inferior nasal conchae |
| numerous air spaces in the body of the lateral masses | ethmoid air cells |
| largely hollow containing the maxillary sinus | body of the maxilla |
| extends upward to articulate with the zygomatic bone | zygomatic process of the maxilla |
| portion bearing the teeth sockets | alveolar process |
| forms the majority of the hard palate | palatine process of maxilla |
| suture between the left and right palatine process of the maxilla | median palatine suture |
| inner anterior midline where the palatine processes blend with the alveolar process | incisive foramen |
| transmits the nasopalatine nerve | incisive foramen |
| just below the lower border of the orbit | infraorbital foramen |
| transmits the infraorbital NAV | infraorbital foramen |
| forms large part of the floot of the orbit | orbital plate |
| articulates with the lacrimal bone and forms part of the lateral wall of the nasal cavity | frontal process |
| in the floor of the orbit. continuous with the infraorbital foramen | infraorbital groove |
| a long fissure on the floor of the orbit separating the orbital plate of the maxilla and the greater wing of the sphenoid | inferior orbital fissure |
| opens posteriorly into the pterygopalatine fossa | inferior orbiral fissure |
| ridges on frontal processes | anterior lacrimal crest |
| bounded by anterior (on maxilla) and posteior (on lacrimal) lacrimal crests | fossa for the lacrimal sac |
| houses the lacrimal sac | fossa for the lacrimal sac |
| located at the inferior part of the nasolacrimal fossa and opens inferiorly in the nasal cavity | nasolacrimal canal |
| houses the nasolacrimal duct | nasolacrimal canal |
| articulates posteriorly with the ethmoid and anteriorly with the frontal process of maxilla; forms part of the medial wall of the orbit | lacrimal bone |
| bone of lower jaw | mandible |
| NAV of same name through the anterior portion of the mandible | mental foramen |
| a pair of projections for muscle attachments on the anterior inner surface | mental spines |
| on the inner surface just below the alveolar process | mylohyoid line |
| roughly perpendicular part that is continuous with the alveolar process | ramus |
| sharp anterior projection on superior ramus | coronoid process |
| articulates with the mandibular fossa of the temporal bone forming the temporomandibular joint | condylar process |
| inner surface of ramus opening to a canal that runs inside the ramus and body to terminate at the mental foramen; transmits the inferior alveolar NAV | mandibular foramen |
| the notch on the superior ramus between the coronoid process and the condylar process | mandiublar notch |
| thin, sharp ridge or projection immediately anterior to the mandibular foramen | lingula |
| contributes to the floor and lateral wall of the orbit | orbital plate of the zygomatic bone |
| a long narrow projection which articulates with the zygomatic process of the temporal bone. together these two processes form the zygomatic arch | temporal process of zygomatic bone |
| bones of the nasal septum | perpendicular plate of the ethmoid and vomer |
| bones of the lateral nasal wall | ethmoid, inferior nasal conchae, maxilla, lacrimal, nasal, palatine and medial pterygoid process |
| bones of the orbit | frontal, greater and lesser wings of the sphenoid, zygomatic, maxilla, ethmoid, lacrimal and palatine |
| bones of the hard palate | palatine process of the maxilla and horizontal process of the palatine |
Created by:
gkeene