Spinal cord is surrounded by spinal piamater. It is made up of outer white and inner gray matter. Surrounding the central canal of the spinal cord is the central mass of gray matter, the cross section of which is like ‘H’. The transverse bridge connecting the lateral halves of this is called the gray commissure. The central […]

The cerebellar hemispheres are divided by transverse fissures into lobules. The surfaces of lobules are marked by folds (folia or lamina) running parallel to the fissure and runs transversely to the longitudinal axis of brain. In cross section of folds, it is seen that they give off secondary and tertiary lamina the whole producing the appearance known

The cerebral cortex is the external layer of gray matter covering the convolutions and fissures of cerebral hemispheres. It contains the bodies of nerve cells, nerve fibres, neuroglia and blood vessels. It shows the following layers from without inwards: Piamater Molecular or plexiform Layer: It is poor in cells and has a framework of the reticulum

Histology of Nervous system can be divided into; Central nervous system (CNS) and Peripheral nervous system (PNS). CNS includes the brain and spinal cord. Cerebrum Cerebellum Spinal cord

The thymus varies in size and development with the age of the individuals. Thymus begins to decrease in size and undergone involution with advancing age and gets gradually replaced by fat and connective tissue. The thymus is covered by a connective tissue capsule, which gives off numerous septa, which divide the gland into a number

Spleen has a capsule of connective tissue rich in elastic tissue and smooth muscle, over the capsule is serosa. Trabeculae from the capsule extend into the interior and form complicated framework by anastomoses. The spaces within the connective tissue framework are filled with a soft sponge like tissue known as splenic pulp. On the basis of

Lymph gland Lymph nodes (Lymph gland) occur in the of lymphatics of lymph vessels. Lymph flows through them. These vary in size form those just visible to naked eye to those several centimeters in diameter. They are flattened and been-shaped with a definite hilum. They have a connective tissue capsule containing a few elastic and

The palatine tonsil is an egg-shaped mass, which bulges into the oral cavity. The oral surface is covered by stratified squamous epithelium. The epithelium passes down into the crypts in the substance of tonsil. Between the crypts the masses of dense. lymphoid tissue arranged in folds containing the individuals follicles. At intervals, between folds of lymphatic

All these structures contain a matrix of reticular tissue the meshes of which are filled with lymphocytes. In addition to formed lymphatic structures like lymph glands, tonsils, thymus and spleen, there are diffuse lymphatic infiltrations in the body in the mm. Of digestive, respiratory and genital systems and conjunctiva. Tonsils Lymph nodes (Lymph gland) Spleen

Hypophysis cerebri The gross structure of this gland includes two lobes – an anterior and a posterior. Histologically the anterior lobe includes pars distalis or pars anterior and the posterior lobe includes pars nervosa and pars intermedia. Pars tuberalis surrounds the upper part of pars nervosa and is continuous with pars intermedia. Between the pars intermedia and pars anterior there is a cleft.