1. If you want an accounting of your worth, count your friends. Merry Browne Unit 6 Day 8

2. This week: Monday—work on objectives related to senses Tuesday—vision and the eye dissection Wednesday—complete objectives Thursday—ear disorders and review Friday-- test

3. Today’s Agenda Revisit reflex arc (see diagram) Objectives 10-15 Practice 10-15 Objectives 16-18 Cranial Nerves WS

5. Objective 11 Cerebral cortex

6. Objective 12 Cerebellum—motor coordination

7. Objective 13 Meninges: - pia mater, dura mater, arachnoid– physical protection for brain and spine. Cerebrospinal fluid-watery-shock- absorbing fluid surrounding the brain and spine. Blood-brain barrier-capillaries impermeable to many substances. This protects the brain and spine from infection.

8. Objective 14 Concusion—head injury causing reversible damage. Contusion—head injury causing irreversible damage.

9. Anterior grey horn Spinal nerve Central canal Posterior grey horn White matter Obj. 15 Dorsal root Ventral root Dorsal ganglion

11. Obj. 11-15 Practice: Find the error 1. Meninges are found in the brain, spinal cord, and all nerves. 2. The cerebrospoinal fluid cushions sinovial joints. 3. Bacteria frequently pass through the blood brain barrier. 4. Contusions are reversible head injuries.

12. Matching 1. Cerebrum 2. Cerebellum 3. Medulla Oblongata 4. Hypothalamus 5. Corpus Callosum A. Connects right and left side of brain. B. Visceral homeostasis C. Speech, reasoning, thought D. Motor coordination E. Survival functions

13. Obj. 16 Peripheral Nervous System Definition: the peripheral nervous system is responsible for sensory and motor output. Components: composed of all the neurons outside the central nervous system. Divided into 2 main categories; sensory division and motor division

14. Obj. 17 Types of Nerves Sensory – only sensory fibers Motor – only motor fibers Mixed – both sensory & motor fibers

15. Obj. 18 Cranial Nerves See fig. 13.1 diagram

16. Today’s Agenda Review the parts of the eye Obj. 19—plexus Obj. 20-23 Practice sympathetic/parasympathetic Taste –obj. 24 Hearing Obj. 27, 28, 29

17. Objective 19 Plexus----see diagram

18. Obj. 20 Reflexes Distinguish between autonomic and somatic reflexes Autonomic reflexes involve the involuntary muscles such as muscles of the heart and intestinal tract. Ex. Pupil dilation Somatic reflexes involves skeletal muscles. For example: gag reflex, patellar reflex

19. Objective 22: Sympathetic/parasympathetic Sympathetic system prepares the body for fight or flight Parasympathetic prepares the body for rest and digestion.

20. Obj. 23 Effects of parasympathetic systems Heart Bronchioles Digestive tract Bladder Iris of eye Blood vessels of skeletal muscles Blood vessels of visceral muscles Penis

21. Obj. 23 Effects of Sympathetic systems Heart Bronchioles Digestive tract Bladder Iris of eye Blood vessels of skeletal muscles Blood vessels of visceral muscles Penis

22. Obj. 24 Taste Four taste sensations are available: Sweet Sour Bitter Salty