Brain and Neuroanatomy — Flashcards

Flashcard 261: Which cranial fossa is supplied by all three branches of the trigeminal nerve?

Answer: Middle cranial fossa

Extra: The **middle cranial fossa** is supplied by meningeal branches from all three divisions of the trigeminal nerve: - **V1 (Ophthalmic):** Recurrent meningeal branch (Nervus tentorii) - **V2 (Maxillary):** Meningeal branch - **V3 (Mandibular):** Nervus spinosus (Meningeal branch) In contrast: - **Anterior cranial fossa:** Supplied by V1 (ethmoidal nerves) and V2 (meningeal branches). - **Posterior cranial fossa:** Supplied by CN X (vagus) and CN XII (meningeal branches carrying fibers from C1-C2).

Flashcard 262: What is the classic triad of **Dandy-Walker malformation**?

Answer: 1. Hypoplasia or agenesis of the **cerebellar vermis** 2. **Cystic dilation of the 4th ventricle** 3. **Enlargement of the posterior fossa** (with upward displacement of the tentorium)

Extra: Dandy-Walker malformation is often associated with **agenesis of the corpus callosum** (in ~25% of cases) and hydrocephalus. **Differential Diagnosis:** * **Mega cisterna magna:** Normal vermis, normal 4th ventricle, enlarged cisterna magna. * **Blake pouch cyst:** Normal vermis, cystic structure in posterior fossa communicating with 4th ventricle.

Flashcard 263: What part of the internal capsule carry the occipitopontine fibres?_____

Answer: Retrolentiform

Flashcard 264: The foveola forms the bottom of the fovea and is devoid of _____ cells

Answer: ganglion

Flashcard 265: Stem cells of the brain are located in the subventricular zone and the _____ gyrus

Answer: dentate

Flashcard 266: Which condition is characterised by atresia of the median aperture (foramen of Magendie) and lateral aperture (foramen of Luschka) of the 4th ventricle?_____

Answer: Dandy-Walker syndrome

Flashcard 267: What is the only segment of the intratemporal part of facial nerve that is not within the fallopian canal?_____

Answer: Meatal

Flashcard 268: Which veins drain the insular region?_____

Answer: Deep middle cerebral veins

Flashcard 269: Both retrolentiform and sublentiform parts of the internal capsule carry the _____ fibres

Answer: parietopontine

Flashcard 270: _____ are the first-order neurons in the visual pathway.

Answer: Bipolar cells