Surface ectoderm gives
rise to all of the following structures except: AIIMS 2003
A. Lens
B. Corneal epithelium
C. Conjunctival
epithelium
D. Anterior layers of
iris
Ans. D
The surface ectoderm (or external ectoderm) forms the following structures:
- Skin (only epidermis; dermis is derived from mesoderm) (along with glands, hair, and nails)
- Epithelium of the mouth and nasal cavity salivary glands, and glands of mouth and nasal cavity
- Tooth enamel (as a side note, dentin and dental pulp are formed from ectomesenchyme which is derived from ectoderm (specifically neural crest cells and travels with mesenchmyal cells)
- Epithelium of pineal and pituitary glands
- Lens, cornea, lacrimal gland, tarsal glands and the conjunctiva of the eye
- Apical ectodermal ridge inducing development of the limb buds of the embryo.
- Sensory receptors in epidermis
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