CPPS 311 Cranial Nerves

CN 1:

• Name

• Sensory, motor, or both

• Main function

• Olfactory nerve

• Sensory (Special Sensory)

• Smell

CN 2:

• Name

• Sensory, motor, or both

• Main function

• Optic Nerve

• Sensory (Special Sensory)

• Vision

CN 3:

• Name

• Sensory, motor, or both

• Occulomotor nerve

• Motor

What are the motor components of CN 3 and their functions

Somatic Motor

• Extra ocular muscles (except superior oblique and lateral rectus)

Visceral Motor (Parasympathetic)

• Ciliary muscle & sphincter pupillae muscle

CN 4:

• Name

• Sensory, motor, or both

• Main function

• Trochlear nerve

• Motor (somatic motor)

• innervates superior oblique

CN 5:

• Name

• Sensory, motor, or both

• Trigeminal Nerve

• Both

What are the components of CN V and their functions

Somatic Motor

• Muscles of Mastification

Somatic Sensory

• sensory innervation of face, scalp, and mouth

CN 6:

• Name

• Sensory, motor, or both

• Main function

• Abducens nerve

• Motor (somatic motor)

• Innervates lateral rectus

CN 7:

• Name

• Sensory, motor, or both

• Facial nerve

• Both

  • Somatic motor

  • Visceral motor

  • Somatic Sensory

  • Special Sensory

What are the components of CN 7 and their functions

1. Somatic Motor: Muscles of Facial Expression

2. Visceral Motor: Submandibular, sublingual, lacrimal, nasal glands

3. Somatic Sensory: Ear sensation

4. Special Sensory: Taste from anterior 2/3 of tongue

CN 8:

• Name

• Sensory, motor, or both

• Main function

• Vestibulocochlear

• Sensory (Special Sensory)

• Positions and movements of head and hearing

CN 9:

• Name

• Sensory, motor, or both

• Glossypharyngeal

• Both

  • Somatic Motor

  • Visceral Motor

  • Visceral Sensory

  • Special Sensory

What are the components of CN 9 and their functions

1. Somatic Motor: Stylopharyngeus

2. Visceral Motor: Parotid Gland

3. Visceral Sensory: Oropharynx and carotid sinus and body

4. Special Sensory: Taste from posterior 1/3 of tongue

CN 10:

• Name

• Sensory, motor, or both

• Vagus Nerve

• Both

  • Somatic motor

  • Visceral Motor

  • Visceral Sensory

  • Special Sensory

What are the components of CN 10 and their functions

1. Somatic motor: larynx and pharynx muscles

2. Visceral Motor: heart, lungs, and muscle and glands of the GI tract and abdominal viscera

3. Visceral Sensory: Larynx, pharynx, heart, lungs, and abdominal viscera

4. Special Sensory: taste from epiglottis and laryngopharynx

CN 11:

• Name

• Sensory, motor, or both

• Main function

• Accessory nerve

• Motor (Somatic motor)

• Sternocleidomastoid and Trapezius

CN 12:

• Name

• Sensory, motor, or both

• Main function

• Hypoglossal nerve

• Motor (somatic motor)

• Muscles of the tongue

What are the CN with special functions

CN 1, 2, 7, 8, 9, 10

Which CNs originate in the Cerebrum

CN 1 and 2

Which CNs originate in the midbrain

CN 3 and 4

Which CNs originate in the pons

CN 5

Which CNs originate in the pontomedullary junction

CN 6, 7, 8

Which CNs originate in the medulla

CN 9, 10, 12

Which CN originate in the spinal cord

CN 11

What do the 6 pharyngeal arches give rise to

1. Trigeminal Nerve

2. Facial Nerve

3. Glossopharyngeal nerve

4. Vagus nerve (superior laryngeal nerve)

6. Vagus nerve (recurrent laryngeal nerve)

What are the three types of motor fibres

1. Somatic Motor (voluntary control of muscles)

2. Somatic Branchial Motor (only found in cranial nerves; innervate voluntary muscles as well)

3. Visceral Motor (parasympathetic fibres; innervate smooth muscle, glands, and heart

What are the three types of sensory fibres

1. Somatic Sensory (pain, temp, touch proprioception)

2. Visceral sensory (carotid body and sinus, pharynx, larynx, thoracic, abdominal viscera)

3. Special Sensory (smell, sight, taste, hearing)