The Cranial Nerves

Question 1

Cranial Nerves

Answer 1

Carry sensory or motor neural signals or both

Question 2

Cranial Nevers

Answer 2

I) Olfactory - sensory
II) Optic - sensory
III) Oculomotor - motor
IV) Trochlear - motor
V) Trigeminal - both
VI) Abducens - motor
VII) Facial - both
VIII) Vestibulocochlear - sensory
IX) Glossopharyngeal - both
X) Vagus - both
XI) Spinal accessory - motor
XII) Hypoglossal - motor

Question 3

Sensory nerves: Cranial Nerves I, II, VII

Answer 3

Olfactory, optic, and vestibulocochlear nerves
- carry only sensory info to brain

Question 4

Olfactory Epithelium

Answer 4

Region of the superior nasal cavities that are sensitive to airborne chemicals

Question 5

Olfactory Nerves

Answer 5

Convey signals to the brain of bad chemical smells and associated with 3 structures
- series of small nerves that pass from the olfactory epithelium in the nasal cavities to the olfactory bulbs in the cranial cavity
-from the olfactory bulbs, olfactory tracts carry the signals to the cerebrum and signals arrive at the olfactory cortex of the temporal lobe

Question 6

Optic Nerves

Answer 6

Carry infromation from retina of the eye to the brain and the 2 nerves meet in front of the hypothalamus at a cross shaped junction: optic chiasm and the neurons continue pas chiasm as optic tracts

Question 7

Vestibulocochlear Nerves

Answer 7

Carry sensory information form the vestibule and the cochlea of the inner ear
- equilibrium

Question 8

Nerves to the Extraocular Muscles (III, IV, VI)

Answer 8

Oculomotor, trochlear, abduces nerves - 3 motor nerves that innervate the muscles that move the eye, the extraocular muscles

Question 9

Mixed Nerves: V, VII, IX, X

Answer 9

Trigeminal Nerve: Supplies motor innervation to the chewing muscles and carries sensory from the face, oral cavities, and nasal cavities - sensory innervation to the face
Facial Nerve: provides motor neurons to the facial expression muscles and sensory neurons from taste buds - innervates superficial muscles of the face
Glossopharyngeal nerve: carries motor neurons to the muscles of the pharynx - swallowing and taste buds
Vagus Nerve: Sensory and motor innervation to many of the body’s internal organs from the neck to the abdomen - not contained head and neck

Question 10

Nerves to the Neck and Tongue: XI, XII

Answer 10

Spinal Accessory Nerve: motor stimulation to the trapezius and sternocleidomastoid muscles of the neck - overlap all other skeletal muscles in the neck
Hypoglossal Nerve: motor nerve to the tongue and innervates the muscles of the tongue that change the tongues shape and those that move the tongues around in the oral cavity