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Bio 168 Covington Brain
Anatomy of the Brain
38
Anatomy
Undergraduate 1
03/29/2009

Additional Anatomy Flashcards

 


 

Cards

Term
Cerebrum
Definition

-One of the 3 main portions of the brain

-takes up 83% of the brain's volume

 

Term
What are the cerebral hemispheres?
Definition

the half-globes of the cerebrum

Term
What are gyri (gyrus, singular)?
Definition
the thick folds of the cerebrum
Term
What are sulci?
Definition
The shallow grooves of the cerebrum that separate the gyri
Term
What is the longitudinal fissure?
Definition
The deep groove in the brain that separates the right and left hemispheres from each other
Term
corpus callosum
Definition

-located at the bottom of the longitudinal fissure

-connects the left and right hemispheres of the cerebrum

-thick bundle of nerve fibers

-this is the prominent landmark for description purposes

Term
Cerebellum
Definition

-inferior to the cerebrum

-occupies the posterior cranial fossa

-2nd largest region of the brain

-10% of the brain's volume but more than 50% of its neurons

Term
What are the 3 major portions of the brain?
Definition
Cerebrum, cerebellum, and brainstem
Term
What are the 3 parts of the brainstem?
Definition
Midbrain, pons, and medulla
Term

Where is the brainstem located?

 

Definition
Below the cerebellum and above the spinal cord
Term
What is gray matter of the brain?
Definition

-Consists of neuron cell bodies, dendrites and synapses

-forms the surface layer over the cerebrum and cerebellum

-also called the cortex

Term
What is the cortex of the brain?
Definition
The surface layer that covers the cerebrum and cerebellum
Term
What is white matter of the brain?
Definition

-lies deep to the gray matter

-composed of tracts

Term

What are tracts?

Definition

bundles of axons

 

Term
What is the pons?
Definition

-Appears as the anterior bulge in the brainstem

-lies just above the medulla

-relays signals assisting with sleep, hearing, equilibrium, taste, eye movements, facial expressions and sensation, swallowing, bladder control and posture

Term

What is folia?

Definition
the gyri of the cerebellum
Term
What is Arbor Vitae?
Definition
the fern-like patter of the cerebellum
Term
Precentral gyrus
Definition
-primary motor area
-most posterior gyrus of frontal lobe immediately anterior to central sulcus
-controls trunk, shoulder, arm and facial muscles
Term
Upper motor neurons
Definition
pyramidal cells of the precentral gyrus
Term
Arachnoid layer of the brain
Definition
-consists of squamous epithelium
-covers corte of the brain
Term
Putamen
Definition
1 of 3 centers of basal nuclei
Term
Basal ganglia
Definition
-masses of cerebral gray matter buried deep in white matter
-lateral to the thalamus
-receives input from the substantia nigra
-involved in motor control
Term
Pyramidal cells
Definition
-output neurons of cerebrum
Term
Cerebral cortex
Definition
layer covering the surface of the cerebral hemispheres
Term
glial and myelinated nerve fibers
Definition
What does the cerebral white matter composed of?
Term
You have no brain function but can still live if...
Definition
you only have your brainstem
Term
What is anterior to the pituitary gland?
Definition
The optic nerves
Term
Pineal body
Definition
This is called the "seed of the soul" b/c it's the only part of the brain that is unpaired
Term
Hypothalamus
Definition
-The pituitary gland hangs from this
-You have to have this and the medulla to live
Term
Post central gyrus
Definition
This is the primary sensory area
Term
Optic chiasm
Definition
This is the "cross" at the base of the brain where the optic nerves cross
Term
Infundibulum
Definition
This is what holds the pituitary gland
Term
Transverse fissure
Definition
This is the crevice between the cerebellum and th occipital lobe
Term
When the brainstem dies...
Definition
you are considered to be braindead
Term
Cerebellum
Definition
"little brain"
Term
Degeneration of Substantia Nigra
Definition
What causes Parkinson's Disease?
Term
Cerebral peduncles
Definition
These anchor the cerebrum to the brainstem
Term
Midbrain
Definition
-short segment of the brainstem that connects the hindbrain to the forebrain
-located above the pons
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