A.11~12mm B.12~13mm C.12~14mm D.14~15mm E.13~14mm
A.17mm B.16mm C.19mm D.18mm E.20mm
A.神經(jīng)節(jié)細(xì)胞層 B.內(nèi)核層 C.外核層 D.內(nèi)界膜 E.神經(jīng)纖維層