Nerve tissue is a fundamental component of the nervous system, responsible for transmitting signals throughout the body. Comprising of specialized cells called neurons, nerve tissue is characterized by its unique structure and function. What is a Nerve Tissue Composition? Within the neurological system, neurons are cells that send messages to other neurons, muscles, or gland…
Overview The term “dermatome” is a combination of two Greek words: “derma” meaning “skin” & “tome” meaning “cutting” or “thin segment”. Dermatomes are areas of the skin whose sensory distribution is innervated by afferent nerve fibers from the dorsal root of a single spinal nerve root, which is the portion of a peripheral nerve that…
What is a Central Nervous System? The central nervous system and the peripheral nervous system are two subtypes of the nervous system. The central nervous system is the brain and spinal cord, while the peripheral nervous system includes everything else. The central nervous system’s responsibilities involve receiving, processing, and responding to sensory information. Responses, sensations,…
Definition The Immune System is the body’s mechanism for preventing or inhibiting infection. It can protect the body against bacteria, viruses, parasites, and more because of its intricate network of cells, organs, proteins, and tissues. A working immune system can provide the difference between healthy tissue and foreign molecules. If an undesirable material, it will…
Overview The Ventricles of the Brain are a connecting network of cavities inside the brain parenchyma that are filled with cerebrospinal fluid (CSF). The ventricular system is made up of two lateral ventricles, a third ventricle, the cerebral aqueduct, and a fourth ventricle (as shown in the figures below). The choroid plexuses in the ventricles…
What does the spinal cord do? What differentiates the spinal cord from the vertebral column? What function does the spinal cord have? What constitutes the spinal cord’s primary components? Three major sections make up the spinal cord: What organs and substances give rise to the spinal cord? Like the brain, the spinal cord is covered…
Introduction The Pudendal Nerve is a major nerve responsible for controlling and innervating the genital and anal regions. It originates from the sacral plexus and travels through the pelvis, supplying various muscles and sensory regions in the perineal area. The word “Pudendal” is derived from the Latin word pudenda, which means “external genitals” and is…
What is the Peripheral Nervous System? The Peripheral Nervous System (PNS) is a vital component of the human nervous system, working in conjunction with the Central Nervous System (CNS) to facilitate communication between the body and the brain. It consists of an intricate network of nerves and ganglia that extend throughout the body, connecting various…
Definition Upper limb dermatomes are specific regions of skin that are innervated by the sensory branches of nerves originating from the spinal cord. These dermatomes correspond to different spinal nerve levels and play a crucial role in conveying sensory information from various parts of the upper limb, such as the fingers, hands, and arms, to…
Definition Dermatomes are specific areas of skin supplied by sensory nerves from a single spinal nerve root. Lower limb dermatomes refer to the regions of skin on the legs and feet that are innervated by different spinal nerve levels. These dermatomes follow a pattern and help healthcare professionals diagnose nerve-related issues based on the location…
