How many cranial nerves are in a sheep brain?

How many cranial nerves are in a sheep brain?

twelve cranial nerves
Bilaterally, red pics mark the roots of the twelve cranial nerves in a sheep brain.

Where are the cranial nerves in a sheep brain?

Sheep Cranial Nerves. Ventral view of a sheep brain. Cranial nerves are marked with red pics and numerical labels. The myelencephalon, located between the pons and the spinal cord, gives rise to seven of the twelve cranial nerves (VI through XIII).

Is a sheep brain similar to a human brain?

The sheep brain is similar to the human brain in that they both have two brain stems, two optic nerves and two hemispheres; but they differ in size and in functions. 2. The human brain is heavier and longer than a sheep’s brain.

What is the gyrus?

A gyrus (plural: gyri) is the name given to the bumps ridges on the cerebral cortex (the outermost layer of the brain). Gyri are found on the surface of the cerebral cortex and are made up of grey matter, consisting of nerve cell bodies and dendrites.

Is the cerebellum rostral or caudal in a sheep brain?

In the sheep brain, the cerebellum is rostral or caudal (circle the best answer) to the cerebral hemispheres. This is different than in the human brain, where the cerebellum is ventral or dorsal (circle the best answer) to the cerebral hemispheres.

How many cranial nerves does a sheep have?

Mammals have 12 pairs of cranial nerves. Some of these nerves are sensory nerves, other are motor nerves, and some are both sensory and motor (mixed). Locate these 12 nerves on your sheep brain, match each function with its associated nerve, and circle whether each nerve is sensory, motor, or both.

What cranial nerves are completely sensory?

Only cranial nerves I and II are purely sensory and are responsible for the sense of smell and vision (optic nerve II). The rest of the cranial nerves contain both afferent and efferent fibres and are therefore referred to as the mixed cranial nerves.

What are the functions of the cranial nerves?

The olfactory nerve is involved in the sense of smell.

The optic nerve is involved in the sense of sight.

The oculomotor nerve controls pupil constriction and eye movement.

The trochlear nerve also plays a role in the movement of the eyes.

The trigeminal nerve plays a role in controlling the muscles needed for chewing.

What cranial nerve carries hearing impulses to the brain?

The third cranial nerve is the Oculomotory nerve, which serves the primary function to transmit nerve impulses from the eye muscles to the brain, to achieve eye movement (this includes dilation and constriction of the pupils.