Definition for Difference between revisions of "Ectoderm"
From Biology Forums Dictionary
| Line 4: | Line 4: | ||
(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. | ||
Latest 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.