http://upload.wikimedia.org/wikipedia/commons/7/7d/Gray734.png

Irregularly shaped cavity in the rhombencephalon, between the medulla oblongata, the pons, and the isthmus in front, and the cerebellum behind. It is continuous with the central canal of the cord below and with the cerebral aqueduct above, and through its lateral and median apertures it communicates with the subarachnoid space.[AAO], The fourth ventricle is an irregularly shaped cavity in the rhombencephalon, between the medulla oblongata, the pons, and the isthmus in front, and the cerebellum behind. It is continuous with the central canal of the cord below and with the cerebral aqueduct above, and through its lateral and median apertures it communicates with the subarachnoid space[GO][GO:0021592]., Fluid-filled brain cavity. Kimmel et al, 1995.[TAO]

rhombencephalic vesicle

uberon

ventricle of rhombencephalon, IVth ventricle, ventriculus quartus, 4th ventricle, ventricle of hindbrain, hindbrain ventricle, rhombencephalic ventricle, fourth ventricle proper

The early development of most vertebrate brains is similar (...). The zebrafish neural tube follows the same basic differentiation pattern as the mammalian neural tube (reference 1); The brain develops from three embryonic enlargements of the neural tube, which later differentiate into five regions. A forebrain differentiates into telencephalon and diencephalon. The midbrain, or mesencephalon, remains undivided. The hindbrain divides into the metencephalon and myelencephalon. Cavities within the brain enlarge to form a series of interconnected ventricles (reference 2).[well established][VHOG]

UBERON:0002422

• tela choroidea of fourth ventricle
• fourth ventricle aperture
• choroid plexus of fourth ventricle