Lecture 3: The Brain Flashcards Preview

CHI 280: Human Anatomy I > Lecture 3: The Brain > Flashcards

Flashcards in Lecture 3: The Brain Deck (41)
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Describe the dura mater

Strong, dense, fibrous membrane continuous with dura mater of the spinal cord
Has 2 layers: endosteal and meningeal layers
Endosteal= periosteum covering inner surface of calvaria. Does not extend through foramen magnum


Dural septae

The dura mater also gives way to another support and stabilisation consisting of the four cranial dural septa.
-Falx cerebri is the largest of the 4. It divides the brain into left and right hemispheres
-tentorium cerebelli- separates the occipital lobe and temporal lobe
-Falx cerebelli- divides cerebellum into r and l hemispheres
-diaphragma sellae
Falx, tent, falx


What is dural innervation?

Only meningeal layer that is innervated by sensory fibres
Richly innervated by meningeal sensory branches from trigeminal nerve, vagus nerve and upper cervical nerves.
They are stretch sensitive => headache


How is the dura mater innervated?

Branches of the trigeminal nerve


Describe the vasculature of the dura

Arteries of the dura supply more blood to the calvaria (ie bones of skull, ie parietal, temporal etc) than to the dura.
Middle meningeal artery (branch of maxillary)
Middle meningeal veins drain into pterygoid venous plexus


Dural blood supply

Internal carotid artery
Maxillary artery
Ascending pharyngeal artery
Occipital artery
Vertebral artery
Middle meningeal arty
Venous drainage => meningeal veins lateral to arteries


Dural venous sinuses
Where are they located?

Between periosteum and meningeal layers of dura. No valves.
-contains blood from superficial brain veins


Name some of the main dural venous sinuses
Slide 13

Study it bitch


What is the thing that connects both hemispheres together?

Corpus callosum


Describe the pia mater

Pa mat is extremely thin but highly vascularised. It sits very closely to gyri of brain and descends into sulci


What the fark is a leptomlenix?

= arachnoid mater + pia mater
Indicated by arachnoid trabeculae passing between arachnoid and pia layers.
Arachnoid is avascular and NOT attached to dura, it is held against dura by CSF pressure.


Label each ventricle of the brain
Slide ?



What is a choroid plexus and what does it do?
What does CSF do?
Where is CSF produced?

Ventricles lined with ependymal cells forming the choroid plexuses that produces and secrete cerebrospinal fluid.
CSF removes waste products associated with neuronal activity and gives brain buoyancy to protect it from damage.
CSF is produced it him lateral, third and fourth ventricles


Arterial blood supply of brain

High energy use, no substrate (glucose) stored and can't metabolise with ought oxygen. Need constant supply of oxygenated blood containing glucose.
Slide 26 be able to label it


What vessels exist Cerebral arterial circle

Anterior communication artery
Anterior cerebral arteries
Internal carotid arteries
Posterior communicating arteries
Posterior cerebral arteries
Slide 27


Arteries of cerebrum
What are the principle arteries?

Anterior cerebral artery (branch of internal carotid artery)
Middle cerebral artery (branch of internal carotid) = largest branch, supplies most of the lateral surface of the cerebra hemispheres.


What is the cause/ effect of aschaemic stroke

Result of impaired cerebral blood flow
Rapid cell death
Brain doesn't store glucose and is incapable of anaerobic metabolism


What is a chiasm?

An anatomical intersection or decussation


What is a decussation?

The action of crossing in the form of an X, especially a tract of nerve fibres crossing contra lateral (opposite) side of the CNS


What is a ganglion?

A mass of tissue containing cell bodies of neurons usually located outside of CNS and form an enlargement upon a nerve.


What is a commissure?

Connecting band of nerve tissue between two anatomical structures


What are fasciculus?

Bundles of nerve fibres that follow the same courses but do not necessarily have same functional connections


What is a tract?

Bundle of nerve fibres having a common origin, termination and function


What are the derivatives of the Forebrain (prosencephalon)

Telencephalon (cerebral cortex, white matter and basal ganglia)
Diencephalon (epithalamus (pineal gland), dorsal thalamus, subthalamus, hypothalamus)


What is the name for the elevated ridges, shallow groves, and deep groves. What is the covering that surrounds it all

Elevated ridges = gyri
Shallow grooves= sulci
Deep groves= fissures
All covered by meninges (pia mater)


What is the role or the hippocampus:

key role in memory and learning


What is the
Corpus callosum
Septum pellucidum

Fornix= tract connecting hippocampus (part of limbic system, consolidates info from short term mem to long term) to mammillary bodies (pair of small round bodies under brain, which is part of diencephalon form part of the limbic system.)
Corpus callosum= commissure between cerebral hemispheres
Septum pellucidum stretches between the two to form medial wall of ventricles.


What are Amygdala

Non basal ganglia : grey matter nuclei
Located inferior to putamen and anterior to tail of the caudate nucleus
Emotional amplifier
Stimulation of amygdala= rage, fear, rest, relaxation. Dependent on prior mood


Label cortical areas

Slide ?


What does the neural tube become
What does the neural crest become

Brain and spinal cord
Neural crest becomes shwann cells that myelinate nerves of the PNS and peripheral ganglia.