Brain Ventricles

Dissected Sheep Brain

Cerebral Hemisphere

Equine Brainstem
Ventricular system:        [NOTE: * = not paired]

two lateral ventricles - within telencephalon
(two interventricular foramina — to third ventricle)
third ventricle* - mostly diencephalon
mesencephalic aqueduct* - within mesencephalon
fourth ventricle* - within hindbrain
(two lateral recesses/foramina — to subarachnoid space)
central canal* - within spinal cord

Blood supply:

internal carotid arteries - trifurcate
(form an arterial circle on ventral surface of brain)
basilar artery*
(arises from terminations of vertebral aa.)

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