CSD LAB 8: Cranium part 1 Flashcards Preview

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Flashcards in CSD LAB 8: Cranium part 1 Deck (7)
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1
Q

six major bones of the cranium

A
  • frontal
  • parietal
  • occipital
  • temporal
  • ethmoid
  • sphenoid
2
Q

frontal bone

A
  • unpaired
  • anterior portion of the cranium (forehead region)
  • inferior surface is the orbital margin (eye socket)
  • posteriorly bound by the coronal suture
  • calvariam - skull cap
3
Q

parietal bone

A
  • paired
  • forms the bulk of the brain case
  • sagittal suture: superior midline, separates the two parietal bones
  • fontanelle: anterior and posterior soft spots on the infant skull which close as the bones of the skull fuse together
4
Q

occipital bone

A
  • unpaired
  • forms the base of the brain case
  • foramen magnum: hole in occipital bone where the spinal cord passes through into the brain
  • occipital condyles: lateral to the foramen magnum, where the skull attaches to C1 (atlas)
  • lamboidal suture: posterior, horizontal suture at the superior margin of the occipital lobe, separates the occipital and parietal lobes
5
Q

temporal bone

A
  • paired
  • forms the lateral portions of the brain case
  • contains the structures for the auditory and vestibular systems
    5 portions:
  • squamous: includes an anterior projection called the zygomatic process which articulates with the zygomatic bone to form the zygomatic arch
  • petrous: hardest portion, forms the base of the temporal bone, houses the organs for hearing and balance
  • mastoid process: prominence behind the ear, behind the EAM
  • tympanic: forms the external auditory meatus
  • styoid process: long, slender, inferior portion
6
Q

ethmoid bone

A
  • unpaired
    parts:
  • cribiform plate: horizontal part, divides the cranium above from the nasal cavities below
  • perpendicular plate: middle portion, forms the upper portion of the nasal septum
  • crista galli: superior projection from the midline of the cribifom plate
  • superior and medial nasal concha: forms the lateral walls of the nasal cavities
7
Q

sphenoid

A
  • unpaired
  • very complicated bone that communicates with (touches) all other bones of the cranium and several face bones
  • resembles a bat with its wings spread
    parts:
  • body: central portion, main mass of bone
  • -sella turcica, turkish saddle: depression in the superior surface of the body
  • greater wings: paired, hold temporal lobes of the brain
  • lesser wings: paired, superior to the greater wings, contribute to the orbital cavity
  • medial and lateral pterygoid plates: paired, vertical plates on the inferior portion of the bone
  • -pterygoid fossa: posterior space between the medial and lateral pterygoid plates
  • hamulus: small prominence attached to the medial pterygoid plate, paried, tensor veli palatine and medial pterygoid muscles wind around the hamulus