Skull Osteology Flashcards
Name the 5 pneumatic bones of the skull.
- Maxilla
- Sphenoid
- Ethmoid
- Frontal
- Temporal
Thinnest part of skull’s lateral wall
Pterion
Bones that make up the pterion
*MNEMONIC: Please Get Some Freaking Plan
- Greater wing of sphenoid
- Squamous part of temporal bone
- Frontal bone
- Parietal bone
Structures passing deep to pterion
Middle meningeal vessels anterior divisions
Sylvian fissure of cerebrum
Clinical significance of trauma to pterion
Risking tearing or damage to middle meningeal vessels which can lead to extradural hematoma, causing brain compression
Name of pterion in the newborn
anterolateral/Sphenoidal fontanelle
By when does the sphenoidal fontanelle ossify?
2-3 months after birth
Asterion formed by which bones?
*MNEMONIC: A More Plausible One
- Mastoid part of temporal bone
- Parietal bone
- Occipital
Name of asterion in newborn
Mastoid/Posterolateral fontanelle
Asterion ossifies by
6 months - 1 year after birth
Part of temporal bone that can’t be seen in norma lateralis
Petrous part
Parts of the temporal bone that can be seen in norma lateralis
Mastoid Squamous Zygmatic process Tympanic plate Styloid process
Structures attaching to zygomatic arch
2 muscles and 1 fascia
Temporal fascia
Temporalis muscle (both attach on its upper border)
Masseter (attaches on its inferior border)
Artery whose pulsation can be felt when palpated against zygomatic arch
Superficial temporal artery
Termination of superficial temporal artery
Into 3 branches:
- frontal
- parietal
- transverse facial
Coronal and sagittal sutures meet at the
bregma
Highest point of the skull
vertex
Parietal foramen transmits the
emissary vein connecting superior sagittal sinus with scalp veins
How many fontanelles are in a newborn? Name them
6
2 mastoid fontanelles
2 sphenoid fontanelles
1 anterior/bregmatic fontanelle
1 posterior/lambdoid fontanelle
State order in which fontanelles close
- Posterior fontanelle (1-3 months)
- Sphenoidal fontanelle (2-3 months)
- Mastoid fontanelle (6-12 months)
- Anterior fontanelle (9-18 months)
Nerve that carries preganglionic secretomotor fibers to sublingual and submandibular glands
Chorda tympani
Locations of auriculotemporal and chorda tympani nerves
Chorda tympani is medial to temporal bone’s spine while auriculotemporal nerve is lateral to the spine
Type of fibers carried by auriculotemporal
postganglionic secretomotor fibers to parotid gland
