Ch 13 Anatomy of the Nervous System PERIPHERAL

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Ch. 13 Anatomy of the Nervous System … PERIPHERAL N. S. © 2013 Pearson

Ch. 13 Anatomy of the Nervous System … PERIPHERAL N. S. © 2013 Pearson Education, Inc.

The Peripheral Nervous System Components: Central nervous system (CNS) (1) Sensory receptors (2) Motor

The Peripheral Nervous System Components: Central nervous system (CNS) (1) Sensory receptors (2) Motor endings (3) Nerves and Ganglia Peripheral nervous system (PNS) Sensory (afferent) division Motor (efferent) division Somatic nervous system Autonomic nervous system (ANS) Sympathetic division Parasympathetic division

I. Sensory Receptors & Sensation A. Sensory Receptors 1. Definition/Function

I. Sensory Receptors & Sensation A. Sensory Receptors 1. Definition/Function

Sensory Receptors … 4. Classification: Chart Lab 7 a) *Location -Extero-, Intero, Proprio-ceptors b)

Sensory Receptors … 4. Classification: Chart Lab 7 a) *Location -Extero-, Intero, Proprio-ceptors b) *Structure- encapsulated or not c) Stimuli Received 1. Mechanoreceptors: • Proprioceptors (location) 2. *Photoreceptors: 3. *Chemoreceptors: 4. *Thermoreceptors: 5. *Nocireceptors: Mechanoreceptors

B. Nerves 1. Structure and Classification *a. Nerve = Remember b. *Connective Tissue skeletal

B. Nerves 1. Structure and Classification *a. Nerve = Remember b. *Connective Tissue skeletal Nerves muscle: (endomysium, § *Endoneurium perimysium, § *Perineurium epimysium) of § *Epineurium c. *Fascicle d. *Vasa Nervorum e. *Neurilemma *Schwann neuron f. *Node of Ranvier Figure 7. 23

Structure and Classification … c. Classification of Nerves i. Information Carried • *Mixed Nerves

Structure and Classification … c. Classification of Nerves i. Information Carried • *Mixed Nerves = • Types of fibers: • *Pure Sensory • Pure Motor ii. Location

1. Cranial Nerves 12 paired Filaments of olfactory nerve (I) Know: name, number, functions,

1. Cranial Nerves 12 paired Filaments of olfactory nerve (I) Know: name, number, functions, and brain regions involved Frontal lobe Olfactory bulb Olfactory tract Optic nerve (II) Optic chiasma Optic tract Oculomotor nerve (III) Trochlear nerve (IV) Trigeminal nerve (V) Abducens nerve (VI) Cerebellum Medulla oblongata © 2013 Pearson Education, Inc. Temporal lobe Infundibulum Facial nerve (VII) Vestibulocochlear nerve (VIII) Glossopharyngeal nerve (IX) Vagus nerve (X) Accessory nerve (XI) Hypoglossal nerve (XII)

OVERVIEW Type of Nerves: - 3 all Sensory: I, II, VIII - 9 (the

OVERVIEW Type of Nerves: - 3 all Sensory: I, II, VIII - 9 (the rest) ARE ALL MIXED RULE: if motor to muscle, then always has proprioception - 5 of 9 mostly Motor (really mixed): III Occulomotor IV Trochlear, VI Abducens XI Spinal Accessory XII Hypoglossal - 4 of 9 Mostly Mixed: V, VII, IX, X - 4 Have Autonomic: III, V, IX, and X = mostly autonomic - Ipsilateral: no crossing over © 2013 Pearson Education, Inc.

Overview … Memory Device "On occasion, our trusty truck acts funny—very good vehicle anyhow"

Overview … Memory Device "On occasion, our trusty truck acts funny—very good vehicle anyhow" "Oh once one takes the anatomy final, very good vacations are heavenly" Figure 13. 6 b Location and function of cranial nerves (Marieb) Cranial nerves I – VI Sensory function I Olfactory IICranial Optic nerves IIII Oculomotor – VI IV Trochlear V Trigeminal Yes (smell) Yes (vision) Sensory No function No Yes (general sensation) No VI Abducens Motor function No No Motor Yes function Yes Yes PS* fibers No No PS* Yes fibers No No No Cranial nerves VII – XII VII Facial VIII Vestibulocochlear Cranial nerves VII – XII IX Glossopharyngeal X Vagus XI Accessory XII Hypoglossal *PS = parasympathetic Sympathetic axons are all in Spinal Nerves © 2013 Pearson Education, Inc. Sensory function Yes (taste) Yes (hearing Sensory and balance) function Yes (taste) No No Motor function Yes Some Motor function Yes Yes PS* fibers Yes No No

1. Cranial Nerves … a) The Olfactory Nerves = I • Sensory: from: olfactory

1. Cranial Nerves … a) The Olfactory Nerves = I • Sensory: from: olfactory bulbs Olfactory tract Cortex = © 2013 Pearson Education, Inc.

b) Optic Nerves = II • *Sensory from: • *optic chiasma: • *Cerebral Cortex

b) Optic Nerves = II • *Sensory from: • *optic chiasma: • *Cerebral Cortex Region: © 2013 Pearson Education, Inc.

c) The Oculomotor Nerves = III • *Location: midbrain • Motor-mostly – *4 eye

c) The Oculomotor Nerves = III • *Location: midbrain • Motor-mostly – *4 eye muscles: ____________ (except Sup Obl & Lat Rect) - From Cortex: – Parasympathetic Motor • Lens: Cilliary Muscles • Sensory: Proprioception - To Cortex: © 2013 Pearson Education, Inc.

d) IV = The Trochlear Nerves • Mixed, mostly motor – Location: Midbrain *Motor:

d) IV = The Trochlear Nerves • Mixed, mostly motor – Location: Midbrain *Motor: Sensory: Proprioception © 2013 Pearson Education, Inc.

e) V = The Trigeminal Nerves • Location: Lateral pons • Mixed Face –

e) V = The Trigeminal Nerves • Location: Lateral pons • Mixed Face – *Sensory: • Proprioceptors • To Cortex: -- *Motor: - From Cortex: • 3 Branches: mostly sensory—Ophthalmic, Maxillary, & Mandibular has somatic m © 2013 Pearson Education, Inc.

f) VI = The Abducens Nerves • Location: posterior Pons Mixed– mostly motor •

f) VI = The Abducens Nerves • Location: posterior Pons Mixed– mostly motor • *Motor • Sensory: proprioception © 2013 Pearson Education, Inc.

g) VII = The Facial Nerves • Location: Pons Mixed • *Motor *Somatic Motor

g) VII = The Facial Nerves • Location: Pons Mixed • *Motor *Somatic Motor for: - To Cortex: Parasympathetic: salivary glands (submandibular & sublingual) and lacrimal glands • Sensory function – Proprioeptors – anterior 2/3 taste buds – - To Cortex: © 2013 Pearson Education, Inc.

h) VIII = The Vestibulocochlear Nerves • Location: Pons-Medulla border Sensory (mostly) – *Sensory:

h) VIII = The Vestibulocochlear Nerves • Location: Pons-Medulla border Sensory (mostly) – *Sensory: 1) 2) - To Cortex: © 2013 Pearson Education, Inc.

i) IX = The Glossopharyngeal Nerves • Location: medulla • Mixed – Motor •

i) IX = The Glossopharyngeal Nerves • Location: medulla • Mixed – Motor • Muscles of – Sensory • Proprioception • • © 2013 Pearson Education, Inc.

j) X = The Vagus Nerves • Location: Lateral medulla • Nerve extends beyond

j) X = The Vagus Nerves • Location: Lateral medulla • Nerve extends beyond head Mixed • Motor– mostly Autonomic • *Parasympathetic Organs: • skeletal muscles of larynx and pharynx • Sensory– visceral: © 2013 Pearson Education, Inc.

k) XI = The Accessory Nerves (Spinal Accessory) • *Location: Mixed– mostly motor •

k) XI = The Accessory Nerves (Spinal Accessory) • *Location: Mixed– mostly motor • Motor: Head & Neck muscles – trapezius & sternocleidomastoid muscles • Sensory – proprioception © 2013 Pearson Education, Inc.

l) XII = The Hypoglossal Nerves • Location: Medulla: near midline, inferior to abducens

l) XII = The Hypoglossal Nerves • Location: Medulla: near midline, inferior to abducens Mixed– mostly motor • Motor: Tongue muscles & muscles attached to Tongue for manipulation of food • Sensory: proprioception © 2013 Pearson Education, Inc.