1. EXERCISE 19: BRAIN AND CRANIAL NERVES

2. FOREBRAIN
MIDBRAIN
HINDBRAIN

5. CEREBRUM
Transverse Fissure

7. ON PARIETAL LOBE Primary somatosensory area
ON FRONTAL LOBE Primary motor area

8. Cortex (superficial) is gray matter White matter is deeper

9. DIENCEPHALON= thalamus + hypothalamus

10. Sensory Nerve Attachments
Optic nerves: to eyes
Optic chiasm: cross
Optic tracts: to brain

11. Endocrine Attachments
Pineal Gland

12. MIDBRAIN
CORPORA QUADRIGEMINA

13. HINDBRAIN

14. HINDBRAIN--cerebellum

15. MENINGES Same setup as spinal cord— Dura mater most superficial,
Arachnoid,
Pia mater closest to brain

16. CHOROID PLEXUSES Specialized capillaries in ventricles
Produce CSF—Circulates from here to central canal (s. cord) & around outside of brain/cord too

17. CRANIAL NERVES 12 pairs Connect to brain: CN I cerebrum CN II thalamus
CN III-XII brain stem
O O O T T A F V G V A H
S S M M B M B S B B M M
Nerve names:
Nerve functions:

18. CN I: OLFACTORY SENSORY Smell From olfactory epithelium
Olfactory nerve-bulb-tract
(Cribriform foramina of ethmoid)
14-21

19. CN II: OPTIC SENSORY From retina Optic nerve-chiasm-tract
(Optic canal-sphenoid)
14-22

20. CN III: OCULOMOTOR Mostly MOTOR To eye muscles
(superior orbital fissures-sphenoid)
14-22

21. CN IV: TROCHLEAR Mostly MOTOR To superior oblique eye muscles
(superior orbital fissures-sphenoid)
14-22

22. CN V: TRIGEMINAL Mixed (sensory and motor) Ophthalmic Branch
Sensory-orbital, upper face structures
Maxillary Branch
Sensory-lower face structures
Mandibular Branch
Mixed-mouth

23. 14-24

24. CN VI: ABDUCENS Mostly motor To lateral rectus eye muscles
(superior orbital fissure)
14-23

25. CN VII: FACIAL Mixed To parts of face
Expressions, tear/salivary glands
14-25

26. CN VIII: VESTIBULOCOCHLEAR
Sensory, from inner ear
Vestibular branch
Balance, equilibrium
Cochlear branch
Hearing
14-26

27. CN IX: GLOSSOPHARYNGEAL
Mixed to head and neck
Sensory: posterior tongue
Motor: pharyngeal muscles (swallowing), salivary gland
14-27

28. CN X: VAGUS Mixed to visceral organs, larynx, pharynx
Sensory: ear, diaphragm, organs
Motor: pharynx, digestive, respiratory, cardiovascular systems
14-28

29. CN XI: ACCESSORY Join at foramen magnum Mostly motor
To muscles of neck, upper back
Cranial root
Fibers originate in medulla
Spinal root
Some motor fibers originate in spinal cord
Join at foramen magnum
14-29

30. CN XII: HYPOGLOSSAL
Mostly motor
To tongue muscles
14-29

31. CRANIAL NERVES

33. Sheep Brain Dissections