W19-L4: Skull and Cranial Cavity Flashcards
Diploe
Spongey bit of bone in between the two layers of compact bone that make up the skull
Coronal Suture
Separates Frontal bone from the left and right parietal bones
Bregma fontalle
Where Coronal suture meets sagittal suture
Sagittal Suture
Separates Left and Right Parietal bones
Lambda Fontalle
Where Sagittal suture meets lambdoid suture
Lambdoid suture
Separates Occipital bones from left and right parietal bones
Pterion
H shaped suture between the frontal, parietal, temporal and sphenoid bones
Features of Frontal Bone
Two parts vertical and horizontal which is demarcated by the supra-orbital margin
Features of Parietal bone
flat and molded to the shape of the brain, meets at the sagittal suture
Features of the occipital bone
flat, molded to the posterior of the brain, has a prominent bump called external occipital protuberance
Features of Temporal bone
Sqamous part is flat and contoured to lateral brain , has a series of projections
Projections of the temporal bone
Zygomatic process to zygomatic bone, posteriorly mastoid process (sternocleidomastoid attaches here), sharp inferior projection is styloid process which gives attachment for muscles of pharynx and oral cavity and inwards wedge shape which forms part of cranial floor called petrous
Features of Sphenoid bone
Superior orbital fissure separates lesser wing from greater wing
Anterior Cranial Fossa
Cribiform plate (olfactory nerve)
Middle Cranial Fossa
- Hypophysial fossa (pituitary gland)
- Optic canal (optic nerve, opthalamic artery)
- Superior orbital fissure (nerves to extraocular muscles and branches of trigeminal nerve)
- Foramen rotundum (maxillary nerve)
- Foramen ovale (mandibular nerve)
- Foramen spinosum (middle meningeal artery)
