Skin type - dermis, Biology

DERMIS (CORIUM) -

  • Mesodermal in origin. More developed part.
  • Leather is obtained from dermis by tanning. Thinnest in eye lid. Connective tissue present.
  • In it 4 types of cell are present -

(i) Fibroblast or fibrocyte - forms fibres attached to fibres.

(ii) Histocytes - Amoeba like, phagocytic in nature.

(iii) Plasma cells - formation of antibodies (g-globuline)

(iv) Mast cells - It forms matrix, heparine & serotonine.

  • Collagen & elastin fibres are present.
  • When elasticity of dermis is lost skin becomes wrinkeled.
  • Dermis consists of b.v., lymph, vessels, unstripped muscles, nerves etc.
  • Sensory papillae present in dermis (not in epidermis to avoid unnecessary stimulation).
  • These papillae are of following types -

(i) Genital corpusulses - On tip of penis & clitoris.

(ii) Vater pecinian corpusulses or baroreceptor - For pressure deeply placed. More in palm & sole.

(iii) Frigido receptor or end bulb of krausi - For cold.

(iv) Allgesi receptor - For pain. Attached to free nerve endings mainly.

(v) Endings of Ruffini or Calore receptor - For hot.

(vi) Tectile corpuscles or missnner's corpuscles or markle's disc - For touch. Markel's disc is diffterent from other in structure.

(vii) Vibreo receptor - For vibration. Basal part of dermis is peniculus adiposa present on hypodermis (not a part of skin). Fat is stored in it. Also helpfull in temp. regulation. This part is absent in eye lid, prepuce & scrotal sac.

  • Outer part of dermis is papillary part or pars papillaris in it dermal papullae present, fibres are dense, lines of langerhanse can be seen.
  • Inner part is reticulate part or pors reticularis, papullae are absent, fibres are scattered.
  • In dermis melanophage cells engulf melanin by phagocytosis.
  • In some area of dermis blood passes from artery to vein directly by shunt or arterioveinuous anastamoses.
Posted Date: 10/1/2012 6:22:08 AM | Location : United States







Related Discussions:- Skin type - dermis, Assignment Help, Ask Question on Skin type - dermis, Get Answer, Expert's Help, Skin type - dermis Discussions

Write discussion on Skin type - dermis
Your posts are moderated
Related Questions
Q. What are the major components of the cytoskeleton? The cytoskeleton is a network of very small filaments and tubules distributed throughout the cytoplasm of eukaryotic cells

Explain Acute Infections Fever Acute Infections Fever:  Acute fevers are of short duration with acute symptoms, the body temperature may rise to above 104°F. Examples of such i

Aortic Valve Repair :  In, acquired AR associated with VSD and prolapse of a cusp, repair is often successful. VSD is closed and at the same time the prolapsed part o

A female Drosophila with singed bristles is crossed to a male with sepia (dark brown) eyes. In the F1, all females are wild-type and all males have singed bristles. F1 males and fe

What is the cytoskeleton, and what are three of its main components? The cytoskeleton is a network of long protein strands located in the cytosol. Three main components are


GASES There are 4 gases in the protoplasm which remain dissolved in its free water. These 4 gases are follows-                  CO 2     >  O 2  > N 2  > H 2

The Stem Cells The Stem Cells are undifferentiated mesenchymal cells that can proliferate and differentiate into many other types of cells.These are Clonogenic cells capable of

Define Functions of Copper? Copper serves as a co-factor, as well as, an allosteric component of enzymes. In many enzymes copper functions as an intermediate in electrno transf

Q. What are the three major types of passive transport? The three main types of passive transport are simple osmosis, diffusion and facilitated diffusion.