Search results
Results from the WOW.Com Content Network
Lung parenchyma showing damage due to large subpleural bullae. Parenchyma (/ p ə ˈ r ɛ ŋ k ɪ m ə /) [1] [2] is the bulk of functional substance in an animal organ or structure such as a tumour. In zoology, it is the tissue that fills the interior of flatworms. In botany, it is some layers in the cross-section of the leaf. [3]
Parenchyma is a versatile ground tissue that generally constitutes the "filler" tissue in soft parts of plants. It forms, among other things, the cortex (outer region) and pith (central region) of stems, the cortex of roots, the mesophyll of leaves, the pulp of fruits, and the endosperm of seeds.
[1] [2] The fluid in this space is called interstitial fluid, comprises water and solutes, and drains into the lymph system. [2] The interstitial compartment is composed of connective and supporting tissues within the body – called the extracellular matrix – that are situated outside the blood and lymphatic vessels and the parenchyma of organs.
This kind of mesenchyme is called ectomesodermal, and is not considered true mesoderm. In triploblastic acoelomates (such as flatworms), the term parenchyma is sometimes used for the middle (mesenchymal) layer, in which the dense layer includes tissues derived from both ectoderm, and entomesoderm (true mesoderm, derived from entoderm).
Some of the mesoderm derivatives include the muscle (smooth, cardiac, and skeletal), the muscles of the tongue (occipital somites), the pharyngeal arches muscle (muscles of mastication, muscles of facial expressions), connective tissue, the dermis and subcutaneous layer of the skin, bone and cartilage, dura mater, the endothelium of blood ...
They form growing parts at the apices of roots and stems and are responsible for the increase in length, also called primary growth. This meristem is responsible for the linear growth of an organ. 2.Secondary meristem. Lateral meristem: Cells which mainly divide in one plane and cause the organ to increase in diameter and girth.
The interaction between stromal cells and tumor cells is known to play a major role in cancer growth and progression. [1] In addition, by regulating local cytokine networks (e.g. M-CSF , [ 2 ] LIF [ 3 ] ), bone marrow stromal cells have been described to be involved in human hematopoiesis and inflammatory processes.
The siphonostele shown on the left may also be called an amphiphloic siphonostele. The eustele shown on the right is collateral, i.e. with all the phloem on one side of the xylem. Siphonosteles have a central region of ground tissue called the pith , with the vascular strand comprising a hollow cylinder surrounding the pith. [ 9 ]