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11 Cards in this Set
- Front
- Back
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At about the ______ week after fertilization, the epidermis consists of only a single layer of ectodermal cells. |
At about the fourth week after fertilization, the epidermis consists of only a single layer of ectodermal cells. |
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At the beginning of the _______ week the single layer, called the ____________, divides and forms a superficial protected layer of flattened cells called the __________. |
At the beginning of the seventh week the single layer, called the basal layer, divides and forms a superficial protected layer of flattened cells called the periderm. |
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By the ______ month of development secretions from sebaceous glands mix with peridermal cells and hairs to form a fatty substance called __________________. |
By the fifth month of development secretions from sebaceous glands mix with peridermal cells and hairs to form a fatty substance called vernix caseosa. |
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What is the composition of vernix caseosa? |
Vernix caseosa consists of secretions from sebaceous glands, sloughed off peridermal cells, and hairs. |
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By about _____ weeks, the basal layer forms an intermediate layer of cells. |
By about 11 weeks, the basal layer forms an intermediate layer of cells. |
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Hair follicles develop at about ____ weeks. |
Hair follicles develop at about 12 weeks. |
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By the ______ month, the hair follicles produce lanugo. |
By the fifth month, the hair follicles produce lanugo. |
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Most sebaceous (oil) glands develop as outgrowths from the sides of hair follicles at about _____ months. |
Most sebaceous (oil) glands develop as outgrowths from the sides of hair follicles at about four months. |
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Sweat glands appear at about ____ months on the palms and soles and a little later in other regions. |
Sweat glands appear at about five months on the palms and soles and a little later in other regions. |
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Nails are developed at about ____ weeks. |
Nails are developed at about 10 weeks. |
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It is not until the _____ month that the nails actually reach the tips of the digits. |
It is not until the ninth month that the nails actually reach the tips of the digits. |
