Nervous system - meninges, Biology

Assignment Help:

Meninges (Singular-Meninx) -

  • Ceverings of brain.
  • By infection in meninges meningitis or brain fever is caused.
  • These menings are internally lined by squamous epithelium and of following types -

(i) Duramatter - Outer thick, fibrous attached to inner part of cranium i.e. Endorachis.

(ii) Arachnoid - Middle layer of meninges. Net like in appearance. Made up of squamous epitelium.

(iii) Piamatter - Inner most layer, thin, membranous, blood vessel present. Gives nourishment to brain. This layer enters into dorsal wall of brain & form choroid plexus or tella choroidea. In man choroid plexus are 5 (2 in lateral ventricle, 2 in 3rd ventricle & 1 in 4th ventricle) in rabbit choroid plexus are 2 (1 in dianchephalon & 2nd in medulla oblongeta).

  • Choroid plexus is responsible to form C.S.F. (cerebrospinal fluid). CSF is formed 20 ml/hr.

Note :- Arachnoid and piamatter are collectively known as leptomeninges.

  • In fishes meninx is menias premitiva. In amphibia arachnoid is absent.
  • Between meninges sub dural & sub arachnoid spaces are present filled with little CSF.

2272_meninges.png

MENINGES


Related Discussions:- Nervous system - meninges

Introduction to fertilization, INTRODUCTIO N - Fertilization is a c...

INTRODUCTIO N - Fertilization is a complex process which involves fusion of male & female gametes. The male gamete in animals is called as sperm & the female gamete as o

What is congenital mitral stenosis, What is Congenital Mitral Stenosis ? ...

What is Congenital Mitral Stenosis ? The onset of symptoms or signs depends on severity of the stenosis, severe the stenosis earlier the presentation. With significant MS, the

What is coarctation of aorta, What is Coarctation of Aorta ? More commo...

What is Coarctation of Aorta ? More common in males (3:l). Narrowing of aorta typically located near aortic attachment of ligamenturn arteriosum or PDA. It can be a localized

Nerves found in human body, Motor nerves : Nerves which carry impulses fro...

Motor nerves : Nerves which carry impulses from brain or spinal cord to effector organs are called efferent or motor nerves. Stimulation of motor nerves makes the muscles to contr

Define the general mortality and morbidity risk, Define the General Mortali...

Define the General Mortality and Morbidity Risk? Obesity increases the risk of morbidity and mortality. The obese are more prone to developing morbidities or other chronic dise

Name the drugs will help relieve for patient x, Patient X has blood plasma ...

Patient X has blood plasma levels of Parathyroid Hormone (PTH) that are always very high due to a tumor consisting of Parathyroid Gland cells that secrete high levels of PTH into t

Define lipid-anchored proteins, A large number of integral proteins in euka...

A large number of integral proteins in eukaryotes do not traverse the membrane but are anchored in one or other leaflet of the bilayer through covalent attachment to a hydrocarbon

Explain the treatment of lyme disease, Treatment of Lyme Disease Lyme d...

Treatment of Lyme Disease Lyme disease in North America is caused by the spirochete  Borrelia burgdorferi, which is transmitted to humans by Ixodes scapularis or pacificus tick

What is lymphatic system in human biology, What is Lymphatic System in huma...

What is Lymphatic System in human biology? The lymphatic system maintains fluid balance and serves in protecting the body from disease. The primary organs of the lymphatic syst

Planning and implementation of nursing care - haemophilia, Planning of Nurs...

Planning of Nursing Care Prevent and control  bleeding. Administer replacement therapy of factor VIII and IX as advised.  Educate and support the patient and family.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd