How many pairs of cranial nerves are in fish and mammals?

In higher vertebrates (reptiles, birds, mammals) there are 12 pairs of cranial nerves: olfactory (CN I), optic (CN II), oculomotor (CN III), trochlear (CN IV), trigeminal (CN V), abducent (or abducens; CN VI), facial (CN VII), vestibulocochlear (CN VIII), glossopharyngeal (CN IX), vagus (CN X), accessory (CN XI), and …

Are there 12 or 13 cranial nerves?

There are conventionally twelve pairs of cranial nerves, which are described with Roman numerals I–XII. Some considered there to be thirteen pairs of cranial nerves, including cranial nerve zero.

Are there 24 pairs of cranial nerves?

Most doctors claim to have 12 cranial nerves, whereas humans in fact have 24 (12 pairs).

How many pairs of cranial nerves are there in frog?

10 pairs
They are – Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Auditory, Glossopharyngeal, and Vagus. So, 10 pairs is the correct answer. Frogs have ten pairs of cranial nerve i.e. 20 numbers.

What are 12 pairs of cranial nerves?

The 12 Cranial Nerves

• I. Olfactory nerve.
• II. Optic nerve.
• III. Oculomotor nerve.
• IV. Trochlear nerve.
• V. Trigeminal nerve.
• VI. Abducens nerve.
• VII. Facial nerve.
• VIII. Vestibulocochlear nerve.

What is 6th cranial nerve?

Cranial nerve six (CN VI), also known as the abducens nerve, is one of the nerves responsible for the extraocular motor functions of the eye, along with the oculomotor nerve (CN III) and the trochlear nerve (CN IV).

Where are the 12 cranial nerves located?

brain
The cranial nerves are 12 pairs of nerves that can be seen on the ventral (bottom) surface of the brain. Some of these nerves bring information from the sense organs to the brain; other cranial nerves control muscles; other cranial nerves are connected to glands or internal organs such as the heart and lungs.

How many cranial nerves do we have?

What are cranial nerves? Your cranial nerves are pairs of nerves that connect your brain to different parts of your head, neck, and trunk. There are 12 of them, each named for their function or structure. Each nerve also has a corresponding Roman numeral between I and XII.

How many cranial nerves does a rabbit have?

In Rabbit there are 12 pairs of cranial nerves.

What are the 31 pairs of spinal nerves?

In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body. Near the spinal cord each spinal nerve branches into two roots.

How many pairs of cranial nerves are present in amphibians animals?

Ten pairs of cranial nerves are present in amphibians.