Brain and Neuroanatomy — Flashcards

Flashcard 291: Thickest part of the corpus callosum is the _____

Answer: splenium

Flashcard 292: How many branches are given off by the ICA in its cavernous part (C4 segment)? Which are they?

Answer: 6 branches: 1. Inferior hypophyseal artery 2. Dorsal meningeal artery 3. Tentorial artery (Artery of Bernasconi-Cassinari) 4. Inferolateral trunk (Artery of the inferior cavernous sinus) 5. McConnell's capsular arteries 6. Branch to the trigeminal ganglion (often from the meningohypophyseal trunk)

Flashcard 293: Which **magnocellular** layer of the lateral geniculate nucleus (LGN) receives **ipsilateral** retinal input?

Answer: Layer 2

Extra: The Lateral Geniculate Nucleus (LGN) consists of 6 layers: - **Magnocellular (M) layers**: 1 and 2 - **Parvocellular (P) layers**: 3, 4, 5, and 6 Input distribution: - **Ipsilateral (I) input**: Layers 2, 3, and 5 - **Contralateral (C) input**: Layers 1, 4, and 6 Therefore, **Layer 2** is the only magnocellular layer that receives ipsilateral retinal input. (Layer 1 receives contralateral magnocellular input).

Flashcard 294: Relations of the Thalamus:Medially, it forms the lateral wall of the _____

Answer: third ventricle

Flashcard 295: _____ tracts transmit auditory & visual impulses via inferior & superior colliculi, respectively

Answer: Tectocerebellar

Flashcard 296: The pathologic lesion in one and half syndrome is in the _____

Answer: dorsal pontine tegmentum

Flashcard 297: Recurrent artey of Heubner is a branch of the _____ cerebral artery

Answer: Anterior

Flashcard 298: _____ nucleus of the cerebellum controls horizontal ocular saccades

Answer: Fastigial

Extra: The fastigial nucleus (the most medial deep cerebellar nucleus) regulates the accuracy and timing of saccadic eye movements. The flocculonodular lobe (vestibulocerebellum) is primarily involved in smooth pursuit and the vestibulo-ocular reflex (VOR).

Flashcard 299: _____ branch of trigeminal nerve is involved in Trotter s triad.

Answer: Mandibular

Flashcard 300: What is the input of the neocerebellum?

Answer: Cerebral cortex