19.4, 19.10 Anat: Skull and cranial cavity

Question 1

What bones meet at the coronal suture?

Answer 1

Frontal, parietal

Question 2

What bones meet at the sagittal suture?

Answer 2

Parietal bones

Question 3

What bones meet at the lambdoid suture?

Answer 3

Parietal and occipital bone

Question 4

What bones meet at the pterion? What can rupture if there is a blow here?

Answer 4

Frontal, temporal and sphenoid

Middle meningeal artery

Question 5

What is the fissure in the wings of sphenoid?

Answer 5

Superior orbital

Question 6

Which fossas do the lesser and greater wings of sphenoid sit it?

Answer 6

Lesser: Anterior cranial fossa
Greater: MIddle cranial fossa

Question 7

Where does the cribiform plate sit? What nerve is relevant?

Answer 7

Anterior cranial fossa, olfactory nerve

Question 8

Where does the pituitary gland sit?

Answer 8

In the hypophysial fossa (middle cranial fossa)

Question 9

What exits:
SOF
Foremen rotundum
Foramen ovale
Foramen spinosum

Answer 9

SOF: nerves to EOM, trigeminal branches
Rotundum: maxillary N
Ovale: mandibular N
Spinosum: MMA

Question 10

What runs in the optic canal? Which fossa does this sit in?

Answer 10

Optic nerve, ophthalmic artery

In the middle cranial fossa

Question 11

Where do the facial and vestibulocochlear nerves exit? What fossa is this in?

Answer 11

Internal acoustic meatus, posterior cranial fossa

Question 12

What exits the jugular foramen? (4) Which fossa is this in?

Answer 12

IX, X, XI, internal jugular vein

Question 13

The hypoglossal nerve exitis the….? Where is this (fossa)

Answer 13

Hypoglossal canal, posterior cranial fossa

Question 14

Where do the falx cerebri, falx cerebelli, tentorium cerebelli and diaphragma sellae project?

Answer 14

Cerebri: beneath sagittal suture (b/w L/R hemispheres)

Tentorium cerebelli: Horizontal plane (cerebellum separated from hemispheres), crescent

Falx cerebelli: a tiny little dura below cerebri

Diaphragma sellae: is a pit in the body of sphenoid

Question 15

What is the sinus above the falx cerebri?

Answer 15

Superior sagittal sinus

Question 16

Where does the inferior sagittal sinus run?

Where does the straight sinus run?

Where does the transverse sinus run?

Answer 16

Along the lower rim of the falx cerebri

Where falx meets tentorium cerebelli

From the confluence of sinuses horizontally around towards each ear

Question 17

What are the sequelae of a rupture of a meningeal artery?

Answer 17

Blood pushes into the extradural area, ICP increases, brain and brainstem get pushed into the foramen magnum leading to cardiorespiratory arrest

Question 18

What may occur e.g. in an elderly person during a fall?

Answer 18

Venous tearing and subdural haemorrhage