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It supplies the stomach, iv Pulmonary Nerve: It innervates the lungs.
Vagus is mixed in nature because it carries both motor and sensory fibres. These nerves arise from the spinal cord and are normally nine pairs, sometimes 10th unpaired nerve is also seen. Rarely 10 pairs of spinal nerves are found.
As soon as two roots come out of the vertebral column, they unite to form a very small branch, which immediately divides into three branches. It is a short branch supplying the skin and muscles of the dorsal side of the trunk.
It is thicker, larger and supplies the skin and muscles of the ventral and lateral side of the trunk mostly, but in some cases it is also connected with the limbs. It is a short fine branch, which arises near the origin of each ventral branch and joins sympathetic cord of Short essay about rainy season side.
Distribution, Functions and Nature of Spinal Nerves: Except the first pair of spinal nerve, all are distributed to the skin and muscles of the respective parts of the body. They carry impulses from the skin receptors to the spinal cord and from the spinal cord to the muscles.
Thus, their nature is mixed. The first spinal nerve is also known as hypoglossal Nerve. It supplies muscles of the tongue, floor of the buccal cavity and some muscles of the shoulder and back. It also takes part in the formation of brachial plexus.
It is a motor branch. The hypoglossal nerve, the second and the third spinal nerves form the brachial plexus.
From the brachial plexus, the second nerve continues as a brachial nerve to the skin and muscles of fore-limb.
The 4th, 5th and 6th spinal nerves supply the skin and muscles of the body wall of the belly region. The 7th, 8th and 9th spinal nerves form the sciatic plexus, which gives off branches to the skin and muscles of the abdomen and hind-limbs. This plexus also supplies some branches to the large intestine, genital ducts and urinary bladder.
The tenth nerve is also known as coccygeal nerve, which is not commonly found in Rana. Whenever this nerve is present, it emerges from the urostyle through an aperture and joins the sciatic plexus.
The fine branches of 10th nerve supply the urinary bladder and cloaca. There is a noteworthy point that the roots of seventh to tenth nerves first run inside the neural canal of the vertebral column for some distance to form a horse-tail shaped structure, the cauda equina.
Later on these nerves come out of the neural canal. It is a system of nerve fibres and ganglia which control and coordinate the involuntary activities of the visceral organs, such as secretion of digestive fluid, action of heart, etc.
This system is autonomic in the sense that it regulates such activities of the body in which the will power of the animal is not involved, for example, the secretion of the digestive fluid is always under the control of autonomic nervous system, but the animal is not aware of it.
The autonomic nervous system is divisible into: It consists of two longitudinal sympathetic cords, one on either side of the vertebral column ventral to the dorsal aorta, which run forward along the outer sides of the systemic arches.
Each cord bears at intervals small black nine to ten sympathetic ganglia connected with the corresponding spinal nerves by the ramus communicans a branch of spinal nerve.Essay # 1. Habitat and Habits Frogs: Rana tigrina is the most widely distributed species in Northern India.
Generally frogs are found in ponds, tanks, pools, ditches, etc. Essay on “A Rainy Day” Complete Essay for Class 10, Class 12 and Graduation and other classes. Shooting An Elephant. An essay by George Orwell, first published in the literary magazine New Writing in In Moulmein, in Lower Burma, I was hated by large numbers of people – the only time in my life that I have been important enough for this to happen to me.
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Greenery returns to the. Out of many vacations, winter vacations has its own delight and enthusiasm. Winter season is blessed with very cool weather conditions. For writing essay on daily routine, first it needs to 'workout plan' for 'daily routines for kids'.