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cranial bones
| Question | Answer |
|---|---|
| the skull/bony skeleton of the head rests where? | superior end of the vertebral column |
| the skull is divided into what 2 main parts? | 8 cranial bones & 14 facial bones |
| what are the bones of the calvaria? | rt & lt pariatial,frontal,occipital |
| what are the bones of the floor? | rt & lt temporal,ethmoid,sphenoid |
| what forms the lateral walls of the cranium & part of the roof of the head? | 2 parietal bones |
| where is the widest portion of the entire skull? | b/w the parietal tubercles of the parietal bones |
| what forms the inferoposterior portion of the calvaria? | the occipital bone |
| what is the external surface of the occipital bone that presents a rounded part? | the squamous portion |
| the squamous portion forms most of the back of the head what is the part of the occipital bone superior to external occipital protuberance? | onion |
| what is the onion? | the prominent bump or protuberance at the inferoposterior portion of the skull |
| what forms the forehead & the superior part of each orbit? | frontal bone |
| the frontal bone consists of what 2 main parts? | squamous/verticalorbit/horizontal |
| the squamous/vertical forms what? | the forehead |
| the orbit/horizontal forms what? | the superior part of the orbit |
| the cranial bones are fused in an adult to form what? | a protective enclosure for the brain |
| in the squamous/vertical portion,what is the glabella | smooth prominence b/w the eyebrows just above the bridge of the nose. |
| what is the supraorbit groove (SOG) the slight | depression above each eyebrow |
| what is on each side of the squamous portion of the frontal bones above the supra orbital grooves? | frontal tuberosity(a larger prominence) |
| the orbital/horizontal portion consist of? | supraorbital margins(som,supercillary,glabella & frontal tuberosities |
| the frontal bone articulates with what four bones? | right & left parietal,sphenoid,& ethmoid |
| below the orbital plates lie facial bones & above the orbital plates is what? | anterior part of the floor of the brain case |
| each orbital plate is separated from the other by what? | ethmoidal notch |
| which bone fits into the ethnoidal notch? | the ethmoid bone |
| where is the nasal spine found at? | anterior end of the ethmoid notch |
| what is the large opening at the base of the occipital bone, which the spinal cord passes as it leave the brain | foramen magnum |
| the two lateral occipital condyles processes articulate with depression on the 1st cervical vertebra called? | atlas |
| what is the two part articulation b/w the skull & the cervical spine? | atlanto-occipital joint |
| the occipital articulate with what six bones | rt & Lt parietal,rt & Lt temporal,sphenoid & atlas |
| where is the temporal bone located at? | b/w the greater wing of the sphenoid bone(anterior) & the occpital bone(posteriorly) |
| what bone is extending anteriorly from the squamous portion of the temporal bone | zygomatic process |
| inferior to the zygomatic process & just anterior to the EAM is what? | temporomandibular fossa |
| what forms the temporomandibular joint? | temporomandibular fossa(which fits into)mandibular |
| what is inferior to the mandible & anterior to EAM is a slender bony projection called? | styloid process |
| each temporal bone is divided into 3 primary parts | squamous portion,mastoid portion,petrous portion |
| what is the upper border/ridge of the petrous pyramids commonly called? | petrous ridge or petrous apex |
| the petrous ridge of the pyramids corresponds to the level of what landmark? | TEA-top of the ear attachment |
| near the ctr of the petrous pyramid on the posterior surface just superior to the juglar foramen is an opening (orfice) the internal acoustic meatus what passes through here? | nerves for hearing & equalibrium |
| each temporal bone articulates with what 3 cranium bones? | partietal,occipital,& sphenoid |
| what contains the sphenoid sinus? | (the central portion of the sphenoid) the body |
| what is the central depression on the body of the sphenoid bone | sella turcica |
| the sella turcica partially surrounds & protects what? | pituitary gland |
| what is the posterior portion of the sella turcica called? | dorsum sellae |
| what is the shallow depression that begins on the back of dorsum sellae of the sphenoid bone to the occipital bone? | clivus |
| the clivus forms what? | base of the support for the pons |
| extending laterally from the body are 2 wings called | lesser wings & greater wings |
| lesser wings -what is located here? | anterior clinoid process |
| greater wings- what is located here? | foramen rotundum,formen ovale,foramen spinosum |
| where is the posterior clinoid process found? | on top of the dorsum sellae |
| what are the 4 process from the body of the sphenoid? | lateral pterygoid,medial pterygoid process,ptergoid hamuli |
| where is the ethmoid bone located at | lies below the floor of the cranium |
| on the ethmoid bone the small upper horizontal portion of the bone is called? | cribriform plate |
| the cribriform plate contains many small openings/foramina what passes through here | olfactory nerves passes through here |
| what is projecting down from the ethmoid bone? | perpendicular plate |
| the ethmoid bone articulate with what two cranial bones? | frontal & sphenoid |
Created by:
ambey
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