Search results
Results From The WOW.Com Content Network
The plexus is the characteristic form of nervous system in the coelenterates and persists with modifications in the flatworms.The nerves of the radially symmetric echinoderms also take this form, where a plexus underlies the ectoderm of these animals and deeper in the body other nerve cells form plexuses of limited extent.
A hair plexus or root hair plexus is a special group of nerve fiber endings and serves as a very sensitive mechanoreceptor for touch sensation. Hair contains a number of different types of nerve endings.
Arteriovenous subpapillary plexus shunting also occurs. [1] [2] [4] Persistent vasoconstriction at the precapillary sphincter creates a local hypoxic environment, thus releasing adenosine into the capillary bed. [7] Vasospasms force adenosine to enter the capillary bed, where it vasodilates the postcapillary venules. [7]
In vertebrates, a venous plexus is a normal congregation anywhere in the body of multiple veins. [1] A list of venous plexuses: This list is incomplete; ...
The plexus is a system of connections of blood vessels, nerves, or lymphatic vessels. The plexus of Raschkow is a network of nerves immediately beneath the odontoblast layer of the dentine, first described by J. Raschkow in 1835. [5]: 275 However, the nerve fibers will only begin entering the dental papilla (pulp) when dentinogenesis starts ...
The deep branches pass beneath the zygomaticus and the quadratus labii superioris, supplying them and forming an infraorbital plexus with the infraorbital branch of the maxillary nerve. These branches also supply the small muscles of the nose.
Sometimes accessory parotid glands are found as an anatomic variation. These are close to the main glands and consist of ectopic salivary gland tissue. [2] Capsule of parotid gland. A capsule of the parotid gland is formed from the investing layer of the deep cervical fascia. It is supplied by the great auricular nerve.
The secondary plexus is a network of fenestrated sinusoid capillaries that provide blood to the anterior pituitary. The cells of the anterior pituitary express specific G protein-coupled receptors that bind to the neuropeptides, activating intracellular second messenger cascades that produce the release of anterior pituitary hormones.