BIOL 235 Chapter 13 Questions with Verified Answers

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BIOL 235: Chapter 13 | Q&A Latest 2025/2026 | 100% PASS layers of the meninges - Answer -top to bottom: dura mater, arachnoid mater, pia mater Describe dura mater - Answer -thick strong layer composed of dense, irregular connective tissue. The dura mater is also continuous with the epineurium, the outer covering of spinal and cranial nerves. Describe arachnoid mater - Answer -the middle of the meningeal membranes, is a thin, avascular covering comprised of cells and thin, loosely arranged collagen and elastic fibers. It is called the arachnoid mater because of its spider's web arrangement of delicate collagen fibers and some elastic fibers. It is deep to the dura mater and is continuous through the foramen magnum with the arachnoid mater of the brain. Between the dura mater and the arachnoid mater is a thin subdural space, which contains interstitial fluid. describe pia mater - Answer --thin transparent connective tissue layer that adheres to the surface of the spinal cord and brain. It consists of thin squamous to cuboidal cells within interlacing bundles of collagen fibers and some fine elastic fibers. -many blood vessels -Triangular‐shaped membranous extensions called denticulate ligaments of the pia mater suspend the spinal cord in the middle of its dural sheath.