Search results
Results From The WOW.Com Content Network
Leptomeningeal collaterals lie within the leptomeninges, the two deep layers of the meninges called the pia mater and the arachnoid mater. [4] Their diameter has been measured at approximately 300 micrometers, [ 5 ] but there is variability between individuals in the size, quantity and location of these vessels, and between either hemisphere ...
The arachnoid and pia mater are sometimes together called the leptomeninges, [11] literally "thin meninges" (Greek: λεπτός "leptos"—"thin"). Acute meningococcal meningitis can lead to an exudate within the leptomeninges along the surface of the brain. [ 12 ]
Pia mater (/ ˈ p aɪ. ə ˈ m eɪ t ər / or / ˈ p iː ə ˈ m ɑː t ər /), [1] often referred to as simply the pia, is the delicate innermost layer of the meninges, the membranes surrounding the brain and spinal cord. Pia mater is medieval Latin meaning "tender mother". [1] The other two meningeal membranes are the dura mater and the ...
The arachnoid mater covering the brain is referred to as the arachnoidea encephali, and the portion covering the spinal cord as the arachnoidea spinalis. The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges (lepto, from the Greek root meaning "thin" or "slender").
Above the subarachnoid space, collagen fibers from the trabeculae are attached to the arachnoid mater, reinforcing it with collagen to withstand fairly strong forces. Below the subarachnoid space, trabecular collagen passes through the pia mater and sub-pial space, and is attached to the basement membrane , beneath which it embeds itself in a ...
The metastatic tumor cells grow either attached to the pia mater covering the brain and spinal cord or floating unattached to the subarachnoid space. [7] Tumors of diverse origins and hematologic cancers may spread to this space. [5] Some patients can develop a leptomeningeal tumor while receiving chemotherapy for their primary tumor. [citation ...
The tela choroidea is a very thin part of the loose connective tissue of pia mater overlying and closely adhering to the ependyma. [2] [1] It has a rich blood supply. The ependyma and vascular pia mater – the tela choroidea, form regions of minute projections known as a choroid plexus that projects into each ventricle.
Although the pia mater adheres to the surface of the brain, closely following the contours of its gyri and sulci, the arachnoid mater only covers its superficial surface, bridging across the gyri. This leaves wider spaces between the pia and arachnoid and the cavities are known as the subarachnoid cisterns. [citation needed]