Q. Give the function of the following structures:
(i) Ear pinna
(ii) External auditory meatus
(iii) Cochlea
(iv) Semicircular canals
(v) Lachrymal gland
(vi) Eyelids
(vii) Retina
(viii) Eye lens
(ix) Pupil
(x) Olfactory lobe
(xi) Optic lobe
(xii) Medulla oblongata