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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

Brain

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

Fore 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

Midbrain

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.

Hind Brain

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

Spinal Cord

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:
1. Cranial nervous: nerves originating from brain are called cranial nerves. In frog. There are ten pairs of cranial nerves.
2. 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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