Dermatomes
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Dermatomes

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…

Central nervous system (CNS)
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Central nervous system (CNS)

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,…

Immune System
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Immune System

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…

Ventricles Of The Brain
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Ventricles Of The Brain

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…

The Spinal Cord
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The Spinal Cord

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…

Pudendal Nerve
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Pudendal Nerve

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…

Peripheral Nervous System
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Peripheral Nervous System

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…

Upper limb Dermatoms
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Upper limb Dermatoms

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…

Lower Limb Dermatomes
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Lower Limb Dermatomes

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…

Cervical Plexus
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Cervical Plexus

Introduction The cervical plexus is a complex network of nerves that originates from the spinal nerves of the cervical region of the spinal cord, specifically from the ventral rami of the first four cervical nerves (C1-C4). This intricate arrangement of nerves plays a crucial role in innervating various structures in the neck, head, and shoulders….