Table III Structures studied and comparisons made
Animal Ventricular System   Rhombencephalic Roof Meninges Choroid Plexuses
1 2 3 4 5 6 7 OtherIntact Midline Foramen Lateral Foramina Pia Arachnoid Dura 1 2 3 4 5
Amphioxus + + - - - - -   - + - - - - + - - - - -
Lamprey + + + + + + +   - + - - + - + - - - + +
Dogfish + + + + + + +   + + - - + - + + + + + -
Goldfish + + + + + + +   + + - - + - + - - + + -
Lungfish + + + + + - -   - + - - + - + + + + + -
Frog + + + + + + +   - - + - + + + - - + + -
Salamander + + + + + - -   - + - - + + + + + + + -
Turtle + + + + + + +   - + - - + + + + + + + -
Pigeon + + + + + + +   - + - - + + + + + + + -
Mouse + + + + - - -   - - - + + + + + + + + -
Ventricular System:

numbers 1,2,3,and 4 refer to the ventricles as numbered in the human; number 5 is the mesencephalic ventricle and numbers 6 and 7 are the bilateral optic ventricles. The heading 'Other' refers to the various recesses and cul-de-sacs of the ventricular system seen in the elasmobranch and teleost fishes.

Choroid Plexuses:

numbers 1,3,3, and 4 refer to the choroid plexuses of the components of the ventricular system as numbered in the human; number 5 refers to the choroid plexus of the mesencephalon.
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