Muscles of iris and ciliary body originate from

Ectodoerm

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Mesoderm

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Endoderm

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All of the above

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Solution

The correct option is B Mesoderm
Muscles of iris and ciliary body are "smooth muscles". Smooth muscle cells arise from undifferentiated mesenchymal cells (embryonic mesoderm). These cells differentiate first into mitotically active cells, myoblasts, which contain a few myofilaments. Myoblasts give rise to the cells which will differentiate into mature smooth muscle cells. Iris is derived from neuroectoderm but the muscles of iris is derived from mesoderm. Thus, the correct option is B.

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Similar questions

Q. Study the following and identify the incorrect statements
(i) Muscles of iris and ciliary body are smooth muscles of mesodermal origin
(ii) Slow and sustained involuntary contraction of smooth muscles are called spasms
(iii) Quiescent mononucleate myogenic cells of skeletal muscles are called pericytes
(iv) Skeletal muscles fibre is multinucleate and is a syncytium

Q. Answer the following.

State the function of iris and ciliary muscles in human eye.

(a) Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve and Blind spot.

(b) What are the functions of the following parts of the eye?

(i) Iris (ii) Eye-lens (iii) Ciliary muscles (iv) Retina (v) Optic nerve

The change in converging power of an eye-lens is caused by the action of:

(a) iris

(b) ciliary muscles

(d) retina

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