
In rabbit, the number of spinal nerves are-
A. 30 pairs
B. 37 pairs
C. 32 pairs
D. 38 pairs
Answer
497.7k+ views
Hint: The spinal nerves as the name indicates are the nerves arising from the spinal cord of an organism. These constitute the paired peripheral nerves. These are not single nerves but a combination of several nerves as they perform a variety of functions such as motor, sensory, and autonomous signals between the spinal nerve and the body. They differ in different organisms in numbers.
Complete answer:
Spinal nerves are termed as mixed nerves as they perform a variety of functions.
In humans, they are present in 31 pairs- 8 cervical, 12 thoracics, 5 lumbar, 5 sacral, and 1 coccygeal. The rabbit is a chordate and has a spinal cord. The spinal cord is a characteristic feature of vertebrates.
There are 37 pairs of spinal nerves present in Rabbit. Each spinal nerve arises from the spinal cord by two roots, a ventral or motor root and a dorsal or sensory root. These roots then further combine to form a nerve. Spinal nerve (each) then divides into three branches-
• Ramus dorsalis (dorsal branch)
• Ramus Ventralis (ventral branch)
• Ramus communicans (visceral branch)
The brachial plexus is formed by the ventral branches containing 4th to 9th spinal nerves. The lumbar plexus develops by the ventral branches of the to spinal nerves. Sacral plexus is developed by the ventral branches of to spinal nerves.
Hence, the correct answer is option (B).
Note: Plexus is a network (branching) of nerves. They are also termed as plexuses. These can be a network of nerves or a network of vessels. The main nerve plexus includes-
• Cervical plexus
• Brachial plexus
• Lumbar plexus
• Sacral plexus
Complete answer:
Spinal nerves are termed as mixed nerves as they perform a variety of functions.
In humans, they are present in 31 pairs- 8 cervical, 12 thoracics, 5 lumbar, 5 sacral, and 1 coccygeal. The rabbit is a chordate and has a spinal cord. The spinal cord is a characteristic feature of vertebrates.
There are 37 pairs of spinal nerves present in Rabbit. Each spinal nerve arises from the spinal cord by two roots, a ventral or motor root and a dorsal or sensory root. These roots then further combine to form a nerve. Spinal nerve (each) then divides into three branches-
• Ramus dorsalis (dorsal branch)
• Ramus Ventralis (ventral branch)
• Ramus communicans (visceral branch)
The brachial plexus is formed by the ventral branches containing 4th to 9th spinal nerves. The lumbar plexus develops by the ventral branches of the
Hence, the correct answer is option (B).
Note: Plexus is a network (branching) of nerves. They are also termed as plexuses. These can be a network of nerves or a network of vessels. The main nerve plexus includes-
• Cervical plexus
• Brachial plexus
• Lumbar plexus
• Sacral plexus
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