Embryology of the brain
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What does the CNS begin as?
As a hollow cylinder AKA neural tube
What is the neural tube filled with?
It has an internal cavity, filled with fluid, AKA neurocoel
What does the expansion of the neurocoel result in?
in 3 prominent divisions called the primary brain vesicles
What are the 3 primary brain vesicles called?
- prosencephalon: forebrain
- mesencephalon: midbrain
- rhombencephalon: hindbrain
What does the forebrain consist of?
- (telencephalon) cerebrum: with lateral ventricle
- (diencephalon) diencephalonand: with 3rd ventricle
What does the midbrain consist of and what does it do?
cerebral aqueduct: a ventricle
connects forebrain to hindbrain
What does the hindbrain consist of?
- metencephalon: cerebellum and pons
- myelencephalon: medualla oblongat
What does the brain stem consist of?
- medulla oblongata
(me mid poo)
What are the surface features of the brain?
- gyrus: elevated ridges
- sulcus: shallow depressions
- fissures: deeper grooves
Identify the lateral sulcus, central sulcus, calcarian and parietal/occipital sulcus on a brain
What are the lobes of the brain?
- parietal lobe
- temporal lobe
- occipital lobe
- frontal lobe
Functional areas - central sulcus
- anterior/pre central: primary motor
- posterior/post central: somatic sensory
- Broca's area: speech motor
Functional areas - Wernicke's area
- crosses over parietal and temporal lobe
- speech comprehension
Functional areas - calcarine sulcus
Functional areas - auditory processing
know where it is
What does the post central gyrus control?
What does the pre central gyrus control?
What does the distorted appearance of the homonculi represent?
The differences in how richly innervated a region is, not its size
thus the hand would take up more space then the bladder
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