Sem 2 - U - The brain - Lobes, cortex/basal ganglia, diencephalon, brainstem, circle of willis, meninges/ventricles/CSF, sinuses Flashcards
Name the lobes in the picture Start with black box and end with yellow

Black box - parietal lobe Red box - occipital lobe Green box - cerebellum Blue box - temporal lobe Yellow box - frontal lobe

Throughout the brain there are bumps and grooves (valleys) What is the proper name for these features?
The bumps of the brain are properly known as a gyrus (gyri=plural) The grooves of the brain are properly known as a sulcus (sulci=plural)

What is the large sulcus in the brain known as separating the frontal and parietal lobes? What gyri are found either side of this? and what is found in these gryi?
The central sulcus separates the frontal and parietal lobe The pre-central gyrus is found anterior to the central sulcus in the frontal lobe containing the primary motor cortex The post-central gyrus is found posterior to the central sulcus in the parietal lobe containing the primary sensory cortex

What is the deep groove in the brain that separates the right and left cerebral hemisphere?
- What arteries are found here?
What separates the frontal and parietal lobes from the temporal lobe and what artery is found here?
The longitudinal fissure separates the right and left cerebral hemispheres. The anterior cerebral arteries can be found here
The frontal and parietal lobes are separated from the temporal lobe by the lateral fissure. The middle cerebral artery can be found within this fissure

What are the areas for speech production and speech comprehension known as? What lobes are they found in?
Broca’s area is where speech production takes place and is found in the frontal lobe Wernicke’s area is where speech comprehension takes place and is found in the temporal lobe

Where is the primary motor cortex found? Where is the primary sensory cortex found? Where is the visual cortex found? Where is the auditory cortex found?
- Primary motor cortex - found in the pre-central gyrus in the posterior frontal lobe
- Primary sensory cortex - found in the post-central gyrus in the anterior parietal lobe
- Visual cortex - found in the occipital lobe
- Auditory cortex - found in the temporal lobe

State what is being labelled Begin with black box End with the brown box

- Black - Corpus callosum
- Red - Septum pellucidum
- Orange - Hypothalamus
- Dark green - Pons
- Light blue - Medulla oblongata
- Dark blue - cerebellum
- Lime green - midbrain
- Brown - thalamus

Where does the septum pellucidum sit?
The septum pellucidum is a sheet separating the anterior horns of the lateral ventricles running down from the corpus callosum to the fornix

What is the white matter tract connecting the cerebral hemispheres known as?
The corpus callosum is the white matter tract connecting the two cerebral hemispheres

- What are tracts between the gyri of the same hemisphere known as?
- What are tracts/fibres from one hemisphere to the same region of the other hemisphere known as?
- What are fibres from cerebrum to thalamus, brainstem etc known as?
Which one of the three above is the corpus callosum?
- * Tracts between gyri of the same hemisphere are known as association tracts
- * Tracts/fibres from one hemisphere to the same region of the other hemisphere are known as commissural tracts/fibres - corpus callsoum consists of a flat bundle of commissural fibres
- * Fibres form cerebrum to thalamus, brainstem etc are known as projection fibres
What structures make up the basal ganglia?
- Caudate nucleus
- Globus pallidus
- Putamen
- Substantia nigra
- Subthalamic nucleus

What is the function of the basal ganglia?
To facilitate purposeful movement
To inhibit unwanted movement
It is also thought to be involved in memory, planning and emotional response via the limbic system
What separates the caudate nucleus and the thalamus from the globus pallidus and putamen on a coronal section?
The internal capsule separates the caudate nucleus and thalamus from the globus pallidus and putamen ona coronal section

- What is the globus pallidus + putamen known as? Which is found closer to the thalamus?
- What is the globus pallidus + putamen + caudate nucleus known as?
- What is the putamen + caudate nucleus known as?
- Globus pallidus + putamen is known as the Lentiform nucleus (globus pallidus is closer to the thalamus)
- Globus pallidus + putamen + caudate nucleus is known as the Corpus striatum
- Putamen + caudate nucleus is known as the Striatum

Where is the substantia nigra found and what does it communicate with?
What does the subthalamic nucleus communicate with?
Substantia nigra is found in the midbrain and communicates with the caudate nucleus and putamen Subthalamic nucleus communicates with the globus pallidus

What artery do the branches to the basal ganglia mainly come from?
Branches to the basal ganglia mainly come from the middle cerebral artery which runs within the lateral fissure

What does the diencephalon give rise to?
The diencephalon gives rise to the thalamus + hypothalamus + epithalamus (contains pineal gland)
What is the major sensory relay station of the brain? How is sensation relayed from spinal cord to here?
The thalamus is the major sensory relay station
Sensory information travels from the spinal cord, to the brainstem to the thalamus and then to the cerebral hemispheres
The thalamus is the major sensory relay system It is also involved in the motor pathways What structure does the thalamus also have connections to?
The thalamus also has connections to the hypothalmus and limbic system
What connects the hypothalamus to the pituitary gland? What is the function of the hypothalamus?
The hypothalamus is connected to the pituitary gland by the infundibulum Hypothalamus is involved in the regulation of the ANS and homeostasis (body temperatures, thirst centres etc) and produces hormones

The pineal gland forms part of the epithalamus found (thalamus + hypothalamus + epithalamus make up diencephalon) What is the function of the pineal gland? What else is found in the epithalamus?
The pineal gland produces melatonin to regulate the body clock The epithalamus also contains the habenular nucleus which is involved in olfaction and the emotional resposne

Which cranial nerves arise in the midbrain and at the level of what?
Cranial nerves III (oculomotor) and IV (trochlear) arise in the midbrain
- CN III arises at the level of the superior colliculus
- CN IV arises at the level of the inferior colliculus

What does the midbrain connect?
The midbrain connects the pons and medulla to the diencphalon
Within the midbrain, we can find the
- * Cerebral aqueduct
- * Superior colliculi
- * Inferior colliculi
- * Substantia nigra
- * Red nucleus
State what each of these is involved in
- Cerebral aqueduct - communication between the 3rd and 4th ventricle
- Superior colliculi - visual tracking/scanning
- Inferior colliculi - involved in the auditory startle reflex (jump scare)
- Substantia nigra - controls sub-conscious muscle action
- Red nucleus - co-ordinate muscle movement





















