Frog Nervous System Short Notes
In this article we will discuss about the frog nervous system
Frog Nervous System
- The set of organs which control and coordinate all the activities of the body is called the nervous system
- The frog nervous system composed of CNS, PNS and ANS
Central nervous system
- CNS is made up of brain & spinal cord
- CNS controls most functions of the body
- The brain is protected in the brain case or cranium
- It is surrounded by two meninges
- Inner cavities of brain are filled with cerebrospinal fluid
- Cerebrospinal fluid is a clear, watery and lymphatic fluid. It protects and nourishes the brain
- Brain has three parts which are called fore brain, mid brain and hind brain
- The most anterior region comprises the olfactory lobes
- Olfactory lobes are concerned with sense of smell
- Immediately behind the olfactory lobes, there are two large outgrowths called the cerebral hemispheres
- Hemispheres are place of memory, intelligence, consciousness
- Posterior to the cerebral hemispheres are called optic lobes
- The part between the optic lobes and hemispheres is known as the diencephalon
- This part is associated with the eyes and vision.
- The last part of the brain consists of the cerebellum and the medulla oblongata.
- This part controls and coordinates body movements and maintains balance of the body
- The medulla oblongata also controls respiration. circulation and digestion
- The spinal cord starts from the posterior end of the medulla oblongata like a thick thread
- Spinal cord are not solid, which is filled with a fluid
- The spinal cord controls the movement of the trunk area and many other functions independently
Peripheral nervous system
- Peripheral nervous system consists of nerves, which connect the central nervous system with various parts of the body
- They are of two types:
- Cranial nervous: nerves originating from brain are called cranial nerves. In frog. There are ten pairs of cranial nerves.
- Spinal nerves: nerves originating from spinal cord are called spinal nerves. There are nine or ten pairs of spinal nerves.
- Nerves are of following types:
- Sensory nerves: these nerves take messages from sensory organs to central nervous system.
- Motor nerves: these nerves take messages from central nervous system to glands and muscles.
- Mixed nerves: they carry out both the above mentioned functions.
Autonomous nervous system
- This controls the autonomous parts (automatic) of the body
- This system control the autonomic parts of the body like heart, lungs & intestine
- Two type of nerves are present in it.
- Sympathetic nerve : it increase the rate of autonomous organs.
- Parasympathetic nerve : it decrease the rate of autonomous organs.
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