Nerves of the head, face, and neck
How many nerve cells in the body?
100 billion
How many pairs of cranial nerves are there
12
How many pairs of spinal nerves extend from spinal cord to muscles and skin?
31
How much does the brain Weigh?
3lbs
PNS
A system of nerves that connects the peripheral parts of the body to the central nervous system
Autonomic nervous system
ANS
Eleventh cranial nerve
Accessory nerve. Motor nerve controls the motion of the neck and shoulder muscles.
Infratrochlear nerve
Affects the membrane and skin of the nose
Posterior auricular nerve
Affects the muscles behind the ear at the base of the skull
Marginal mandibular nerve
Affects the muscles of the chin and lower lip
Mandibular Nerve
Affects the muscles of the chin lower lip and external ear
Buccal nerve
Affects the muscles of the mouth
Temporal nerve
Affects the muscles of the temple side of forehead, eyebrows, eyelid, and upper part of the cheek
Zygomatic nerve
Affects the muscles of the upper part of the cheek
Nasal nerve
Affects the point and lower side of the nose
Cervical nerves
Affects the side of the neck and platysma muscle
Supratrochlear nerve
Affects the skin between the eyes and upper side of the nose
Supraorbital nerve
Affects the skin of the forehead, scalp, eyebrow, and upper eyelid
Infraorbital nerve
Affects the skin of the lower eyelid, side of the nose, upper lip, and mouth
Mental nerve
Affects the skin of the lower lip and chin
Sensory nerves
Afferent nerves. Carry impulses or messages from the sense organs to the brain. Touch, smell, sight, hearing, taste.
Smaller occipital nerve
Also known as lesser occipital nerve. Located at base of the skull; affects the scalp and muscles behind ear
Deep peroneal nerve
Anterior tibial nerve. Extends down leg, behind the muscles. Impulses to leg muscles and skin on foot adjacent sides of first and second one
Reflex
Automatic reaction to stimulus
CNS
Central nervous system
CNS
Consists of brain, spinal nerves, and cranial nerves.
Common peroneal nerve
Division of the sciatic nerve that extends from behind the knee to wind around the head of the fibula to the front of the legs
Tibial nerve
Division of the sciatic nerve that passes behind the knee. Supplies impulses to the knee, muscles of the calf, skin of the leg, and the sole, heel, and the underside of toes
Dorsal nerve
Dorsal cutaneous nerve. From toes and foot. Under skin. Impulses to toes and foot as Stella's the muscles and skin of the leg
Motor nerves
Efferent nerves. Carry impulses from the brain to the muscles or glands
Nervous system
Exceptionally well organized body system composed of the brain, spinal cord, and nerves, that is responsible for controlling and coordinating all other systems of the body and makes them work
Axon
Extensions of the neuron through which impulses are sent away from the cell body to other neurons glands or muscles
Auticulotemporal nerve
External ear and skin above temple up to the top of the skull
Seventh cranial nerve
Facial nerve, chief motor nerve of the face.
Saphenous nerve
Impulses to the skin of inner side of leg and foot
Sural Nerve
Impulses to the skin of the outer side and back of foot
ANS
Is the part of the nervous system that controls the involuntary muscles
Fifth cranial nerve
Largest of the cranial nerves. Trifacial nerve or trigeminal nerve
Greater auricular nerves
Located at the side of the neck; affects the face, ears, neck, and parotid gland
Cervical cutaneous nerve
Located at the side of the neck; affects the front and sides of the b co as far down as the breastbone
Greater occipital nerve
Located on the back of the head; affects the scalp as far as the top of the head
Superficial peroneal nerve
Musculocutaneous nerve. Down leg. Impulses to muscles of the skin of the leg and skin of toes
Neuron
Nerve cell. Primary structural unit of nervous system
Brain
Part of the CNS containing in the cranium
PNS
Peripheral nervous system
Spinal cord
Portion of the central nervous system that originates in the brain and extends down tithe lower extremity of the trunk
Median nerve
Sensory motor nerve that is smaller than the ulnar and radial nerves and that with its branches supplies the arm and hand
Ulnar nerve
Sensory motor nerve that with its branches affects the little finger side of the arm and palm of the hand
Digital nerve
Sensory motor nerve that, with its branches, supplies Impulses to the fingers
Radial nerve
Sensory motor nerve that, with its branches, supplies the thumb side of the arm and back of the hand
Ophthalmic nerve
Supplies impulses to the skin of the forehead, upper eyelids, and interior portion of the scalp, orbit, eyeball, and nasal passage
Maxillary nerve
Supplies impulses to the upper part of the face
Neurology
The scientific study of the structure , function, and pathology of the nervous system
Dendrites
Tree-like branches of nerve fiber extending from nerve cell that carry impulses toward cell and receive other impulses
Nerves
Whitish cords made up of bundles of nerve fibers held together by connective tissue
