| Lab 9 Central Nervous System: 1) Index 2) Introduction 3) Things To Identify 4) Spinal Chord 5)Ventral Horn Motor Neurons 6) Cerebrum 7) Cerebellum 8) Choroid Plexus 9) Practical |
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CHOROID
PLEXUS
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| # 51 - Choroid plexus, human, H&E |
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The choroid plexus is found on the walls or roof of each of the four ventricles. The epithelium that lines the choroid plexus is classified as simple cuboidal. The cells will exhibit cilia and microvilli at their free surface. This epithelial lining continues into the spinal cord and forms the ependyma. The central nervous system is cushioned from shock by cerebrospinal fluid (CSF) which fills the ventricles of the brain, the subarachnoid space and the central canal of the spinal cord. CSF is formed by the choroid plexuses which are vascular structures that project into the brain ventricles. Filtrate from the capillaries in the plexuses pass through the cuboidal epithelial lining to enter the ventricles. These capillaries are large and thin-walled with fenestrations. The production of CSF involves active secretion of certain ions followed by passive water movement. Pink-staining calcified concretions may be seen in this slide and are called "brain sand" or corpora arenacea. Part of the choroid plexus is near the pineal gland whose secretions may become calcified. This deposition of calcifiec secretions increases in number with age. References: Gartner, p. 143, Fig. 4 Wheater, p. 134, Fig. 7.25 |
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This is a shot of Choroid Plexus. The red arrows are pointing to the simple cuboidal, specialized ependymal cells that make up the choroid plexus. The blue arrow is pointing (red circular structures) to what are known as Brain Sand. These are normal calcifications found in the brain. Red arrow - Choroid Plexus Ependymal Cells Blue arrow - Brain sand |
Choroid Plexus |
