<prompt> True about 3rd ventricle isCavity of rhombencephalonCommunicates with lateral ventricle aqueduct of sylviusCommunicates with 4th ventricle foramen of munroIntehalamic adhesions connects lateral walls of 3rd ventricle  <response>: 3rd ventricleCavity of DiencephalonMedian cleft between 2 thalamic nucleiConnected to lateral ventricle Foramen of munroConnected to 4th ventricle aqueduct of sylviusFloor contains Optic chiasma, mammillary body, Infundibulum pituitary stalk, Tuber cinereumPosterior wall : Pineal body, posterior commissure and cerebral aqueduct 