Neuroanatomy Practical 3 Flashcards
Lateral view of cerebral hemisphere (frontal pole on the right)

What structure is hidden between the temporal and parietal lobes? What fissure/sulcus is it located in?

Insula: portion of the cerebral cortex folded deep within the lateral sulcus (the fissure separating the temporal lobe from the parietal and frontal lobes) within each hemisphere of the mammalian brain.

Function of insula (N.B. part of lobe been removed in photo)

processes information associated with hearing and equilibrium

What is being pointed to? (lobes have been removed)

Insula
Which foramina connect each lateral ventricle to the 3rd ventricle?
Interventricular foramen / foramen of Monro
Where does the 3rd ventricle sit?
The diencephalon encloses the third ventricle (thalamus either side)
Which structure sits either side of the 3rd ventricle?
Thalamus
Which structure is being pointed to? Function?

The interthalamic adhesion (also known as the intermediate mass or middle commissure) is a flattened band of tissue that connects both parts of the thalamus at their medial surfaces
Which foramen connects the 3rd and 4th ventricle?
Cerebral aqueduct
Which structures sit anterior and posterior to the 4th ventricle?
Pons anteriorly and cerebellum posteriorly
What is the 4th ventricle continuous with?
The central canal of the medulla and spinal cord
Where does CSF escape into subarachnoid space?
From 4th ventricle via foramen of Lushka (x2) laterally and foramen of Magendie (x1) medially/posteriorly
What brain region contains the cerebral aqueduct?
Midbrain
View of dorsal aspect of 4th ventricle behind pons

This is the hippocampus (one on right and one on left). Where does it sit? Function?

Sits in temporal lobe –> memory
Describe shape of hippocampus
Sends fibre bundle (fornix) with characteristic C-shape as it arches over the thalamus to end up in the hypothalamu

What is the fornix?
The fornix is a C-shaped bundle of nerve fibers in the brain that acts as the major output tract of the hippocampus. The fornix also carries some afferent fibers to the hippocampus from structures in the diencephalon and basal forebrain. The fornix is part of the limbic system.

Describe location of hippocampus and fornix
- Sits inferior to inferior horn of lateral ventricle in the temporal lobe
- Fornix sits medial to lateral ventricles and arches over thalamus to end in the hypothalamus

What does the fornix connect to?
Mamillary bodies of hypothalamus
What is found lateral to the thalamus?
Fibres of internal capsule

What does the internal capsule contain?
Ascending (sensory) and descending (motor) fibres
What is the internal capsule found medial to?
Lentiform nucleus

What composes the lentiform nucleus?
- Putamen (laterally)
- Globus pallidus (medially)
View of caudate nucleus
- C-shaped exterior of caudate nucleus; head, body and tail
- Lentiform nucleus in middle

























































