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In anatomy, the meninges (/ m ə ˈ n ɪ n dʒ iː z /; [1] [2] sg. meninx / ˈ m iː n ɪ ŋ k s, ˈ m ɛ n ɪ ŋ k s /; [3] from Ancient Greek μῆνιγξ (mêninx) 'membrane') [4] are the three membranes that envelop the brain and spinal cord. In mammals, the meninges are the dura mater, the arachnoid mater, and the pia mater.
The arachnoid trabeculae (AT) are delicate strands of connective tissue that loosely connect the two innermost layers of the meninges – the arachnoid mater and the pia mater. [ 1 ] [ 2 ] They are found within the subarachnoid space where cerebrospinal fluid is also found.
[1] Aspelund et al. had discovered that in the eye, another immune-privileged organ, the Schlemm's canal is a lymphatic-like vessel. [10] Building upon this insight, the authors hypothesized that similar vessels might exist in the meninges, given its immune-privileged status, eventually leading to the identification of meningeal lymphatic ...
[1] [full citation needed] 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 ...
The middle meningeal artery (Latin: arteria meningea media) is typically the third branch of the first portion of the maxillary artery.After branching off the maxillary artery in the infratemporal fossa, it runs through the foramen spinosum to supply the dura mater (the outer meningeal layer) and the calvaria.
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.
[1] The two cavities are continuous with one another. [2] The covering and protective membranes for the dorsal body cavity are the meninges. [3] It is one of the two main body cavities, along with the ventral body cavity.
In bacterial meningitis, bacteria reach the meninges by one of two main routes: through the bloodstream (hematogenous spread) or through direct contact between the meninges and either the nasal cavity or the skin. In most cases, meningitis follows invasion of the bloodstream by organisms that live on mucosal surfaces such as the nasal cavity ...