Brain and Neuroanatomy — Flashcards

Flashcard 261: _____ artery forms the main supply of the ventral optic chiasma

Answer: Anterior communicating and internal carotid

Flashcard 262: The foveola forms the bottom of the fovea and is devoid of _____ cells

Answer: ganglion

Flashcard 263: Stem cells of the brain are located in the subventricular zone and the _____ gyrus

Answer: dentate

Flashcard 264: 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 265: What part of the internal capsule carry the occipitopontine fibres?_____

Answer: Retrolentiform

Flashcard 266: Both retrolentiform and sublentiform parts of the internal capsule carry the _____ fibres

Answer: parietopontine

Flashcard 267: Great cerebral vein opens into the _____ sinus

Answer: straight

Flashcard 268: What is the only segment of the intratemporal part of facial nerve that is not within the fallopian canal?_____

Answer: Meatal

Flashcard 269: 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 270: Nomenclature of basal ganglia:Corpus striatum: _____

Answer: Caudate nucleus + putamen+ globus pallidus (3)