The pharyngeal plexus is located in the pharynx and is a plexus of nerves containing predominantly fibers from the ninth and tenth cranial nerves. It controls muscles of the pharynx and palate as well as glands in the pharyngeal mucosa, which it also innervates sensitively. Swallowing disorders (dysphagia) and sensory disturbances may be due to … Pharyngeal Plexus: Structure, Function & Diseases
The lacrimal nerve represents a branch of the ophthalmic nerve and sensitively innervates the conjunctiva (tunica conjunctiva) and parts of the eyelid. It is connected to the facial nerve and the zygomatic nerve. The latter gives fibers to the lacrimal nerve via a communication branch, which influence the lacrimal gland. What is the lacrimal nerve? … Lacrimal Nerve: Structure, Function & Diseases
The eye muscles serve the motor function of the eyeballs, accommodation of the lenses, and adaptation of the pupils. The 6 external eye muscles are able to move the two eyeballs in unison and synchronously or to focus on a gaze target. The inner eye muscles are responsible for focusing on near or far vision … Eye Muscles: Structure, Function & Diseases
Skeletal muscles and visceral smooth muscles are controlled by motoneurons that descend efferently from the CNS. Thus, motoneurons are responsible for reflex motor function as well as overall voluntary motor function. Damage to the central motoneurons manifests symptomatically in so-called pyramidal tract signs. What are motor neurons? Motoneurons are motor neurons in the central nervous … Motoneuron: Structure, Function & Diseases
Our bone and skeletal system is not a rigid structure and is naturally subject to a continuous transformation process. Bone substance is regularly degraded by special cells, the so-called osteoclasts, and in return is rebuilt by the cells known as osteoblasts. Structural damage to the bone, caused by everyday movements and loads, is repaired as … Marble Bone Disease
Symptoms In marble bone disease, the disturbed bone structure leads to instability of the bone with an increased susceptibility to fractures. These fractures are characterized by a poor healing tendency, which can lead to a permanent loss of stability in the skeletal system or to repeated fractures. Bone pain may also occur. The marble bone … Symptoms | Marble Bone Disease
Diagnostics Your doctor will determine whether it is a marble bone disease by asking specific questions about your symptoms, such as frequent poorly healing bone fractures, and by confirming the suspected diagnosis using imaging procedures such as X-rays of your skeletal system. This is because typical characteristics of marble bone disease can be identified in … Diagnostics | Marble Bone Disease
A relaxing breakfast on Sunday morning. While chewing the delicious roll, a stabbing pain shoots in one side of the face in a flash. This is over after a few seconds, but so intense that the tears come. The name says it all: trigeminal, the triplet nerve, is the name for the fifth cranial nerve, … Trigeminal Neuralgia: Severe Pain in the Face
The auditory nerve is one of the most important nerves, as it is responsible for transmitting acoustic information to the brain. If its function is disturbed – this can happen, for example, due to infections of the inner ear, strong noise or circulatory disorders – the hearing ability of the affected person is reduced. In … Auditory Nerve: Structure, Function & Diseases
Synonym nerve cells, neurons, lat. : nerve, -i Definition Neurons are nerve cells and therefore part of the nervous system. They serve the Recording, Processing and Forwarding of information. A nerve cell consists of a cell body (perikaryon or soma) and extensions. There are two types of extensions: Dendrites and Axons. Physiology Information is transmitted … Nerves
Excitation line In order for the information to spread along the nerve cell and be transmitted over long distances, action potentials must be generated along the nerve again and again. Two forms of excitation conduction can be distinguished: In saltatory conduction, parts of the nerve are so well isolated in regular sections that the excitation … Excitation line | Nerves
Central and peripheral nerves A distinction is made between a central nervous system (CNS) and a peripheral nervous system (PNS) and thus also between central and peripheral nerve cells. The nerve cells of the CNS include, for example, the motoneurons, which are found in both the brain and the spinal cord. In terms of numbers, … Central and peripheral nerves | Nerves
