Tentorium Cerebelli

Tentorium Cerebelli

Question 1. Tentorium cerebella
Answer:

• 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

Margins:

1. Anterior free margin
2. Outer attached margin

Surfaces:

• Superior convex surface
• Inferior concave surface

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Question 2. Diaphragm sellae
Answer:

• It is a small circular, horizontal fold of duramater forming the roof of the hypophyseal fossa
• It has a central aperture through which the stalk of the hypophysis cerebri passes

Attachments of tentorium cerebelli

Attachments:

1. Anteriorly

• To the tuberculum sellae

2. Posteriorly

• To the dorsum sellae

3. On each side

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• Continuous with the duramater of the middle cranial fossa
• 

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Question 3. Hypoglossal nerve
Answer:

• It is the twelfth cranial nerve
• It supplies the muscles of the tongue

Functional components:

• General somatic efferent
• General somatic afferent

Nucleus:

• It lies in the floor of fourth ventricle beneath Hypoglossal triangle

Branches:

1. Branches containing fibres of the Hypoglossal nerve proper

• They supply extrinsic & intrinsic muscles of the tongue

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2. Branches of the hypoglossal nerve containing fibres of nerve C1

1. Meningeal branch
   • Supplies bone & meninges in the anterior part of the posterior cranial fossa
2. Descending branch
   • Continues as upper root of the ansa cervicalis
3. Branches to the thyrohyoid & geniohyoid muscles