Bucco-pharyngeal membrane made up of

Discussion in 'AIIMS Nov 2013' started by samuel, Dec 10, 2014.

  1. samuel

    samuel New Member

    Bucco-pharyngeal membrane made up of
    a) Endoderm
    b) Ectoderm
    c) Endoderm, mesoderm
    d) Ectoderm and endoderm

    Answer: Ectoderm and endoderm

    Explanation:
    The bucco-pharyngeal membrane forms the
    external upper membrane limit (cranial end) of
    the early gastrointestinal tract (GIT).
    This membrane region first develops in the tri-
    laminar embryo (week 3) during gastrulation.
    The “membrane” quality comes from being
    composed of only ectoderm and endoderm,
    without a middle layer of mesoderm.

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