The retina (pronounced: RET-nuh), the innermost of the three layers, lines the inside of the eyeball. The retina is a soft, light-sensitive layer of nervous system tissue. The optic nerve carries signals from the retina to the brain, which interprets them as visual images.
What body system is the eyes part of?
Anatomy of the eye
The eye is the main organ of the visual system, it gets images seen by the person and turns them into an electric signal which is carried along the optic nerve to the brain.
What are the parts of the nervous system?
The nervous system is made up of the central nervous system and the peripheral nervous system: The brain and the spinal cord are the central nervous system. The nerves that go through the whole body make up the peripheral nervous system.
Is the nervous system?
The nervous system is the major controlling, regulatory, and communicating system in the body. It is the center of all mental activity including thought, learning, and memory. Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.
What system is the tongue in?
The tongue is a muscular organ in the mouth of a typical tetrapod. It manipulates food for mastication and swallowing as part of the digestive process, and is the primary organ of taste.
|System||Alimentary tract, gustatory system|
|Artery||lingual, tonsillar branch, ascending pharyngeal|
What are the 7 parts of the nervous system?
The central nervous system (defined as the brain and spinal cord) is usually considered to have seven basic parts: the spinal cord, the medulla, the pons, the cerebellum, the midbrain, the diencephalon, and the cerebral hemispheres (Figure 1.10; see also Figure 1.8).
What are the 5 main parts of the nervous system?
The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts.
- Afferent neurons. …
- Efferent neurons. …
What are the 3 main parts of the nervous system?
The human nervous system is made up of three basic parts: the central nervous system, the peripheral nervous system, and the autonomic nervous system. Without a doubt, it is the most complex part of the human body, a masterpiece of nature.
What are the 4 types of nerves?
These are the sensory nerves, motor nerves and mixed nerves.
What are the 4 major functions of the nervous system?
The four main functions of the nervous system are:
- Control of body’s internal environment to maintain ‘homeostasis’ An example of this is the regulation of body temperature. …
- Programming of spinal cord reflexes. An example of this is the stretch reflex. …
- Memory and learning. …
- Voluntary control of movement.
Which part of the peripheral nervous system calms the body?
The autonomic nervous system is made of two components, which work in opposition to one another: the sympathetic nervous system, responsible for the body’s “fight-or-flight” response to danger, and the parasympathetic nervous system, which calms the body back down.
How long is human tongue?
Size. Typically a human tongue is around 3.3 inches (8.5 centimeters) for men and 3.1 inches (7.9 cm) for women, according to the University of Edinburgh.
Can you swallow your tongue?
Swallowing the tongue is virtually impossible. In the human mouth, a small piece of tissue called the frenulum linguae, which sits behind the teeth and under the tongue, keeps the tongue in place, even during a seizure.
Why is my tongue white?
White tongue is usually caused when bacteria, debris (like food and sugar) and dead cells get trapped between the papillae on the surface of your tongue. These string-like papillae then grow large and swell up, sometimes becoming inflamed. This creates the white patch you see on your tongue.