Chapter 8.8: Nervous System

12 pairs Olfactory Nerves Sense of smell

The Cranial Nerves

Figure 8.25a

Optic Nerves Visual information from the eyes

Cranial cont..

Figure 8.25a

Oculomotor Nerves Muscles that move the eyes Controls the amount of light entering the

eye Controls the shape of the lens

Cranial cont…

Figure 8.25a

Trochlear Nerves Moves the eye

Cranial cont…

Figure 8.25a

Trigeminal Nerves Chewing

Cranial cont…

Figure 8.25a

Abducens Nerves Abducts the eyeball

Cranial cont…

Figure 8.25a

Facial Nerves Deep pressure sensations of the face Taste Facial expressions Controls tears and saliva

Cranial cont…

Figure 8.25a

Vestibulocochlear Nerve Sensory receptors in inner ear Position, movement and balance Hearing

Cranial cont…

Figure 8.25a

Glossopharyngeal Nerves Taste Blood Pressure Swallowing Salivary Glands

Cranial cont…

Figure 8.25a

Vagus Nerves Controls soft palate, pharynx and

esophagus Affects cardiac and smooth muscles Affects glands of digestive system

Cranial cont…

Figure 8.25a

Accessory Nerves Swallowing Vocal cords and speech

Cranial cont…

Figure 8.25a

Hypoglossal Nerves Control over tongue muscles

Cranial cont…

Figure 8.25a

Cervical plexus Muscles of neck Controls diaphragm

The Spinal Nerves

Figure 8.26

Brachial plexus Shoulder girdle and upper limbs

Spinal cont..

Figure 8.26

Lumbar and sacral plexus Pelvic girdle and lower limbs

Spinal cont…

Figure 8.26