5. Paired Bones of Cranial Vault Flashcards
SBS flexion moves the paired bones into what type of motion?
External rotation
So SBS extension=internal rotation
What other bones do the parietal bones make contact with? (5)
Frontal Sphenoid Temporal Occiput Other parietal
What fontanelles do the parietal bones make contact with? (4)
Bregma (ant. fontanelle)
Lambda (post. fontanelle)
Pterion (sphenoid fontanelle)
Asterion (mastoid fontanelle)
What axis do the parietal bones move about?
Move in a coronal plane about a sagittal axis
How many axis(es) do the parietal bones have?
Two sagittal
During flexion, which direction does the sagittal articulation move and which way does the temporal articulations move?
Sagittal articulation moves inferiorly, temporals move laterally
During extension, which direction does the sagittal articulation move and which way does the temporal articulations move?
Sagittal articulation moves superior, temporals move medially
What clinical signs and symptoms are associated with parietal dysfunction?
Cranial synostosis
Head pain (tension headaches), face, tooth pain
Middle meningeal artery issues
What is sagittal synostosis?
Where the sagittal suture fuses, head grows in an elongated “watermelon” shape
What is lambdoid synostosis?
Where the lambdoid suture fuses in infancy, and your head becomes tilted on the cranial base
What are the parts of the temporal bone? (5)
Squamous portion (suture) Zygomatic Process Mastoid Styloid Process Petrous Portion
What organs and nerves are associated with the petrous portion? (4)
Otovestibular organ
Eustachian tube
Encloses internal corotid
Forms jugular foramen for CN IX and XI
What bones does the temporal bone contact? (5)
Zygomatic Sphenoid Parietal Occipital Mandible (TMJ)
Where is the axis for the temporal bone?
Just inferior to the petrous ridge
Which way does the squamous portion and the mastoid process of the temporal bones move during SBS flexion
Squamous portions move laterally, zygomatic processes and mastoid move medially
Which way does the squamous portion and the mastoid process of the temporal bones move during SBS extension?
Squamous portions move medially, zygomatic processes and mastoid move laterally
What clinical symptoms are associated with temporal bone dysfunction?
TMJ
Head Pain
Neck Pain (SCM attaches to mastoid)
Ear: Dizziness, ear infections, tinnitus
Why is the frontal bone considered a paired bone?
In babies, the suture is still there and fuses as adults
-some people keep the suture though
What bones does the frontal bone contact? (7)
Parietals Sphenoid Zygoma Lacrimals Ethmoid Maxillae Nasals
How many axises does the frontal bone have?
2 vertical axises
Describe the movement in the lateral portion of the frontal bone and the glabella during SBS flexion?
Lateral portions move anterior, glabella moves posterior
-kind of like if you were folding the frontal bone in half
Describe the movement in the lateral portion of the frontal bone and the glabella during SBS extension?
Lateral portions move posterior, glabella moves anterior
What are the clinical symptoms of frontal bone issues?
Frontal or global head pain Frontalis muscle issues Sinusitis Visual issues Anosmia
What is a bicoronal synostosis?
Where both of the frontal bones fuse with the parietal bones at coronal suture, leaving space for the head to grow very wide
wide head=brachycephaly
Tall head=turricephaly
What is a unicoronal synostosis?
Where one of the frontal bones fuses with the parietal bones at coronal suture, leaving space for the head to grow crooked, creating a facial twist
Affected forehead is flat, while contra forehead is more anterior
