Week 3: Station 5 - Floor of the Skull Flashcards
Which bone forms the posterior boundary of the anterior cranial fossa?
Sphenoid
Which bones form the
A) anterior boundary
B) floor
C) posterior boundary
of the middle cranial fossa?
A) Sphenoid
B) Sphenoid and temporal
C) Occipital
What is shown here and what 4 bones meet at this suture?
Pterion
- Frontal
- Temporal
- Parietal
- Sphenoid
Which bones form the anterior and posterior border of the posterior cranial fossa?
Anterior - temporal
Posterior - Occipital
- Cribriform plate
- Crista galli
- Anterior cranial fossa
- Optic canal
- Foramen rotundum
- Foramen ovale
- Foramen spinosum
- Foramen lacerum
- Sella turcica
- Foramen magnum
- Hypoglossal canal
- Jugular foramen
- Internal acoustic meatus
- Superior orbital fissure
- Incisive foramen
- Inferior orbital fissure
- Palantine foramen
- Pterygoid plate
- Condylar foramen
- Stylomastoid foramen
- Carotid canal
- Styloid process
- Zygomatic arch
- Mastoid process
- Occipital condyle
- Mandibular fossa
- External occipital protuberance
What passes through the cribriform plate?
Olfactory nerve
What passes through the optic foramen?
Optic nerve
Opthalmic artery
What passes through the superior orbital fissure?
Occulomotor nerve
Trochlear nerve
Opthalmic division (V1)
Abducens nerve
Opthalmic veins
What passes through the foramen rotundum?
Maxillary division (V2)
What passes through the foramen ovale?
Mandibular division (V3)
What passes through the foramen spinosum?
MMA
MMV
What passes through the foramen lacerum?
Greater petrosal nerve
What passes through the carotid canal?
ICA
What passes through the internal acoustic meatus?
Facial
Vestibulocochlear
Labyrinth artery
What passes through the jugular foramen?
Glossopharyngeal (IX)
Vagus (X)
Accessory (XI)
IJV
Posterior meningeal artery
What passes through the hypoglossal foramen?
Hypoglossal nerve
What passes through the foramen magnum?
Spinal cord
Vertebral arteries
Anterior spinal artery
Posterior spinal artery
Spinal part of accessory nerve (XI)
Between what layers are venous sinuses located?
The inner and outer layers of the dura
What vessel forms the groove that starts lateral to the foramen spinosum??
Middle Meningeal artery
What is significant about the course of the MMA?
It travels across the inner surface of the pterion
This makes it vunerable to damage from a blow to the head as the pterion is very weak
What is shown here?
Internal occipital protuberance
What structure makes this groove?
Transverse venous sinus
