Humans have approximately 10,000 taste buds, each of which contains 50 to 100 taste cells that come into contact with the substrate to be tasted via tiny taste buds and then report their information to the central nervous system (CNS) via afferent nerve fibers. About 75% of the buds are integrated into the mucosa of … Taste Buds: Structure, Function & Diseases
The deltoid muscle is a large sheet-like skeletal muscle that resembles a triangular scarf when extended and spans the entire shoulder. It holds the head of the humerus in the socket and, together with other muscles, serves to elevate the humerus within a certain angular range. What is the deltoid muscle? The deltoid or deltoid … Deltoid Muscle: Structure, Function & Diseases
The natural tooth crown is the upper part of the tooth that protrudes from the gum. It is covered with enamel and makes up the visible part of the tooth. In order to maintain tooth function, when it is destroyed, the natural tooth crown must be replaced with an artificial tooth crown. What is the … Dental Crown: Structure, Function & Diseases
Meissner’s corpuscles are RA mechanoreceptors that sense pressure changes and belong to the differential receptors. Meissner corpuscles exclusively report pressure changes and adapt to constant pressure stimuli. Misperceptions of the receptors often have their origin in the central nervous system. What is the Meissner corpuscle? Receptors are the first site of human perception. These sensory … Meissner Corpuscles: Structure, Function & Diseases
The axon hillock represents the site of origin of the axon. This is where the action potential is formed, which is transmitted through the axon to the presynaptic terminal. The action potential forms in the axon hillock from the sum of individual specific stimuli and must reach a specific threshold value for stimulus transmission. What … Axon Hillock: Structure, Function & Diseases
The tooth root is a part of the tooth and serves to attach it to the periodontium. The front teeth usually have one root, while the more distal teeth have up to three roots. Inflammation in the root of the tooth or at the tip of the root is often very painful and, without treatment, … Tooth Root: Structure, Function & Diseases
Definition A dermatome is an area of the skin that is autonomously innervated by the nerve fibres of a specific spinal cord root (spinal nerve root). The name “dermatome” comes from the Greek and is composed of the words for skin and section. The understanding of dermatomes is of great importance in medicine for various … Dermatome
Transmission from internal organs Internal organs also transmit sensations that arise in them partly via the spinal nerves. Sometimes, however, the brain does not succeed in assigning the signals received in this way to an exact location, as is possible for skin areas. As a result, the sensations originating from the organ are transmitted to … Transmission from internal organs | Dermatome
A Ranvier lacing ring is a ring-shaped interruption of the fat or myelin sheath surrounding nerve fibers. In the course of “saltatoric excitation conduction” it serves to increase the speed of nerve conduction. Saltatoric, from Latin: saltare = to jump refers to the “jump” of an action potential that takes place when it encounters a … Ranvier lacing ring
Muscle fibers form the basic cellular and working unit of all skeletal muscles in humans. They can range in length from less than 1 mm to 50 cm with a thickness of about 0.01 to 0.2 mm. Several muscle fibers become muscle fiber bundles, which – also combined into several – form the muscle in … Muscle Fiber: Structure, Function & Diseases
A nerve fiber is a portion of a nerve. A nerve is composed of several nerve fiber bundles. These nerve fiber bundles contain many nerve fibers. Each nerve fiber is surrounded by the so-called endoneurium, a kind of protective mantle around each nerve fiber. The endoneurium consists of connective tissue and elastic fibres and because … Nerve fiber
Markless nerve fibers Markless nerve fibers can be found mainly where information does not have to be passed on so quickly. For example, pain nerve fibers that transmit information about pain sensation to the brain are partially markless. This is important because, for example, there is pain that has to last a long time. In … Markless nerve fibers | Nerve fiber
