SiteGround
www.siteground.com
Web Hosting Services Crafted with Care!
ASH Job Center
www.jobcenter.hematology.org
By American Society of Hemotology

THE STRUCTURE OF BODY WALL AND ENDO SKELETON OF STAR FISH

Published in Zoology
Monday, 05 June 2017 10:37
The body wall of star fish consists of 1. Epidermis 2. Dermis 3. Muscles and 4. Coelomic epithelium.
 
1. Epidermis
 
The epidermis is made by ciliated columnar epithelium. It secretes a thin layer of cuticle. The cuticle and epidermis will cover the tube feet, pedicellariae and dermal branchiae. Neuro-sensory cells are scattered here and there in the epidermis. They are spindle shaped. These cells are connected with network of nerve fibres present below the epidermis. Club shaped gland cells are also scattered here and there in the epidermis. They secrete mucous. It forms a protective layer on the body.
 
2. Dermis
 
The dermis is formed of fibrous connective tissue. It is formed from the mesoderm. It is very thick and divisible into outer and inner regions. The outer region secretes ossicles. They form the endoskeleton. The inner region of the dermis contains perihaemal spaces.
 
3. Muscles
 
They are smooth muscles. They are outer circular and an inner longitudinal muscles.
 
4. Coelomic Epitbelim
 
The coelomic epithelium is made by cubical cells. They are ciliated. It is called parietal peritoneum.
 
Functions of body wall
 
  1. It gives protection to the internal organs.
  2. It produces endoskeleton.
  3. The cilia and pedicellariae clean the surface and dermabranchiae.
  4. The peritoneum secretes coelomic fluied.
 
Endoskeleton
 
The endoskeleton is made by calcareous ossicles. They are secretd by dermis. Each ossicle is made by a network of calcareous rods. The ossicles are connected by connective tissue and muscles. Ossicles are irregularly arranged on the aboral side. They lie in two rows on either side of the ambulacral groove. These ossicles are long. They are called the ambulacral ossicles. The ossicles show notches, two near by ossicles will show a round opening, through this opening tube feet will come out.

Useful Sites

  • NCBI

    National Center for Biotechnology Information
  • LTO

    Lab Tests Online® by AACC
  • ASCP

    American Society for Clinical Pathology
  • ASM

    American Society for Microbiology
  • The Medical Library®

    Project of BioScience.pk

Sponsored Links

SiteGround
www.siteground.com
Web Hosting Services Crafted with Care!
Make money online!
www.adf.ly
Use a URL shortener service that pays.
BioScience.pk App
www.bioscience.pk
Put vital info into the palm of your hand.
Advertisement

Sponsored Links

SiteGround
www.siteground.com
Web Hosting Services Crafted with Care!
Daily Science
www.bioscience.pk
The Science News app that will get you to the breaking news.
Online Digital Library
www.bioscience.pk
Free Downloads Medical Books.
Make money online!
www.adf.ly
Use a URL shortener service that pays.
BioScience.pk App
www.bioscience.pk
Put vital info into the palm of your hand.
ASH Job Center
www.jobcenter.hematology.org
By American Society of Hemotology

Connect With Us

Contact Us

All comments and suggestions about this web site are very welcome and a valuable source of information for us. Thanks!

Tel: +(92) 302 970 8985-6

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Website: https://www.bioscience.pk

Our Sponsors

Findeen.com

By using BioScience.pk you agree to our use of cookies to enhance your experience on this website.