Cranial Cavity

Cranial Cavity

Question 1. Name the folds of dura mater present in the cranial cavity
Answer:

• Falx cerebri- large sickle-shaped fold
• Tentorium cerebri-Tent-shaped fold
• Falx cerebelli- Small sickle-shaped fold
• Diaphragm sellae- Small circular, horizontal fold

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Question 2. Trigeminal ganglion in middle cranial fossa
Answer:

• It is a sensory ganglion of the Voot ganglia

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Question 3. Circle of Wills
Answer:

• It is an arterial circle, situated at the base of brain in the interpeduncular fossa

Formed by:

1. Anterior & middle cerebral branches of internal carotid artery

• They are interconnected by anterior communicating artery

2. Posterior cerebral branches of basilar artery

• Middle & posterior cerebral artery are united by posterior communicating artery

Branches:

1. Cortical/ External branches
2. Central branches

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Question 4. Processes of dura mater of brain
Answer:

1. Falx cerebri

• It is large sickle-shapes fold of duramater
• It occupies the median longitudinal fissure between the two cerebral hemispheres

2. Falx cerebelli

• It is small sickle shaped fold of duramater
• It projects into the posterior cerebellar notch

3. Tentorium cerebelli

• It is tent shaped fold of duramater forming the roof of the posterior cranial fossa
• It separates cerebellum from the occipital lobes of the cerebrum
• It divides cranial cavity into supratentorial & infratentorial compartments

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Question 5. Enumerate paired dural sinuses
Answer:

• Cavernous sinus
• Superior petrosal sinus
• Inferior petrosal sinus
• Transverse sinus
• Sigmoid sinus
• Sphenoparietal sinus
• Petrosquamous sinus
• Middle meningeal veins