White matter is a component of the central nervous system, in the brain and superficial spinal cord, and consists mostly of glial cells and myelinated axons that transmit signals from one region of the cerebrum to another and between the cerebrum and lower brain centers. Gray matter is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil (dendrites and myelinated as well as unmyelinated axons), glial cells (astroglia and oligodendrocytes) and capillaries. Grey matter is
A conclusion will then be drawn based on the discussion. The brain is an essential organ of the body. It is the control center for all the body’s activities, such as walking, talking, swallowing, breathing taste, smell and heart beat. The brain also controls our thinking functions, our intellectual activities as well as our emotions. Hemispheric specialization refers to the dominance of one hemisphere of the brain in specific functions, such as language, emotions, motor control and so on ( Feldman, 2009).
To accomplish the primary functions of the nervous system there are neural pathways to transmit impulses from receptors to the circuitry of the brain, which manipulates the circuitry to form directives that are transmitted via neural pathways to effectors as a response. II. SENSATION A. Sensation is a conscious or unconscious awareness of external or internal stimuli. Perception is the conscious awareness and interpretation of sensations.
It is made up of the brain and spinal cord which make up the central nervous system, and the somatic nervous system and autonomic nervous system which make up the peripheral nervous system. The central nervous system makes up ninety-nine percent of the nerve cells located in the body. The peripheral nervous system connects the brain and spinal cord to other parts of the body. This means the peripheral nervous system does what the central nervous system wants him to do; therefore, the central nervous system is always working. The nervous system consists of voluntary and involuntary processes that are carried out by a certain area of the nervous system.
(2000) defines the frontal lobe as the part of the brain that controls important cognitive skills in humans. It is located in the front of the brain deep to the frontal bone of the skull. It plays an integral role for example the following functions that is memory formation, emotions, decision making/reasoning, personality, conscious thought, behaviour, planning, organizing, problem solving. The frontal lobe is the most uniquely human of all the brain structures. It is also responsible for primary motor function, or our ability to consciously move our muscles, and the two key areas related to speech, including Broca’s area.
Neurons Neurons are the basic units of communication in the nervous system. Neurons affect biological functions and behavior. Types of Neurons There are three types of neurons: Afferent or sensory neurons, which are specialized neurons located in the eyes, ears, nose mouth and skin. These neurons are sensitive to light, sound, taste, smell, or other stimuli. They send messages about the environment to the central nervous system (CNS).
Hence this concept stresses upon the differences between the right brain and the left brain which ultimately determines a person's nature. First of all it's important for us to understand the basic brain biology. A simplified mode of the human brain consists of many parts which include: * Brain stem, hind brain, mid brain and cerebellum * Limbic system, which consists of many specialist organs including Hypothalamus, hippocampus. * Cerebral cortex, which is the distinguishing feature of human brains. The cortex is divided into two hemispheres, left and right which are connected by a thick layer of cells called corpus callosum.
Nervous tissues are found is all organs in the body some have more than others thought, Maximum in the nervous system, least in fatty deposits. Some examples are brain which is a main nervous tissue but also an organ also the heart that is one of our most important organ but also a nervous tissue. Here’s a labelled picture of a nervous tissue; http://biologyonline.us/Online%20A&P/AP%202/Northland/AP2lab/Lab%201%20online/lab1/images/Picture14.jpg Epithetical tissue The function of the epithetical tissue include transportation of materials, protection of underlying tissues, absorption of water and nutrients and secretions of waste products. Epithelial tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers.
There is part of the brain that is the reticular formation, which is also referred as the reticular activity system. It is referred to the reticular activity system because it plays a major role in the arousal stage. “Arousal is not the only function that the reticular formation is involved in; sleep attention, mobility, and the maintenance of muscle, as well as other cardiac, circulatory, respiratory reflexes”. Metencephalon The metencephalon is much like the myelencephalo. This is the part of the brain where the ascending and descending tracts are housed.
Comparing tissues – Muscle and connective Tissue There are many types of tissues in the body which all have specialised functions and interacts with the structure and function of the organs. The main types are muscle tissue and connective tissue. Muscle tissue is highly specialised for contractions which, when attached to the skeleton, allows your body to move. Muscle tissue can also be attached to the wall of hollow organs and the contractions cause them to move, this is called a peristaltic movement. The bulk of the cytoplasmic volume inside the tissue is the contractile protein, fibrils actin and myosin.