AskDefine | Define hypodermis

Dictionary Definition

hypodermis n : layer of cells that secretes the chitinous cuticle in e.g. arthropods

User Contributed Dictionary

English

Etymology

hypo- + dermis

Alternative forms

Noun

hypodermis
  1. An epidermal layer of cells that secretes an overlying chitinous cuticle, as in arthropods.
  2. A layer of cells lying immediately below the epidermis.
  3. A subcutaneous layer of loose connective tissue containing fat cells, lying beneath the dermis.

Derived terms

Translations

skin

Extensive Definition

The hypodermis, also called the hypoderm, subcutaneous tissue, or superficial fascia is the lowermost layer of the integumentary system in vertebrates. Types of cells that are found in the hypodermis are fibroblasts, adipose cells, and macrophages. It is derived from the mesoderm, but unlike the dermis, it is not derived from the dermatome region of the mesoderm. In arthropods, the hypodermis is an epidermal layer of cells that secretes the chitinous cuticle. The term also refers to a layer of cells lying immediately below the epidermis of plants. This cell is also used to supervise the outer skin from burns and other such articulates.
The hypodermis is used mainly for fat storage.
According to the eighth edition of Developmental Biology by Scott F. Gilbert, the hypodermis of C. elegans is derived from ectoderm.
hypodermis in German: Subkutis
hypodermis in Swedish: Underhuden
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