Definition for Difference between revisions of "Ectoderm"
From Biology Forums Dictionary
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| − | The outermost layer of cells formed during gastrulation that covers the surface of the embryo and differentiates into the epidermis and nervous system. | + | The outermost layer of cells formed during [[gastrulation]] that covers the surface of the embryo and differentiates into the epidermis and [[nervous system]]. |
Derivatives originate from: | Derivatives originate from: | ||
| − | (a) Somatic ectoderm: e.g., epidermis; hair and feathers; skin glands; olfactory organs; eye lens; inner ear; anterior pituitary gland. | + | (a) '''Somatic ectoderm:''' e.g., epidermis; hair and feathers; skin glands; olfactory organs; eye lens; inner ear; anterior pituitary gland. |
| − | (b) Neural tube: brain, spinal cord, retina, optic nerve, posterior pituitary, cranial nerves, spinal motor nerves. | + | (b) '''Neural tube:''' brain, spinal cord, retina, optic nerve, posterior pituitary, cranial nerves, spinal motor nerves. |
| − | (c) Neural crest: e.g., chromatophores; Schwann cells and myelin; adrenal medulla; cells of cranial, spinal, and autonomic ganglia; branchial skeleton; parts of the cranial skeleton. | + | (c) '''Neural crest:''' e.g., chromatophores; Schwann cells and myelin; adrenal medulla; cells of cranial, spinal, and autonomic ganglia; branchial skeleton; parts of the cranial skeleton. |
Revision as of 21:31, 21 September 2019
The outermost layer of cells formed during gastrulation that covers the surface of the embryo and differentiates into the epidermis and nervous system.
Derivatives originate from:
(a) Somatic ectoderm: e.g., epidermis; hair and feathers; skin glands; olfactory organs; eye lens; inner ear; anterior pituitary gland. (b) Neural tube: brain, spinal cord, retina, optic nerve, posterior pituitary, cranial nerves, spinal motor nerves. (c) Neural crest: e.g., chromatophores; Schwann cells and myelin; adrenal medulla; cells of cranial, spinal, and autonomic ganglia; branchial skeleton; parts of the cranial skeleton.