If you want an accounting of your worth, count your friends.

Merry Browne

Unit 6 Day 8

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

Today’s Agenda

Revisit reflex arc (see diagram) Objectives 10-15 Practice 10-15 Objectives 16-18 Cranial Nerves WS

Objective 11 Cerebral cortex

Objective 12 Cerebellum—motor coordination

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.

Objective 14Concusion—head

injury causing reversible damage.

Contusion—head injury causing irreversible damage.

Anterior grey horn

Spinal nerve

Central canal

Posterior grey horn

White matter

Obj. 15

Dorsal rootVentral root

Dorsal ganglion

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.

Matching1. Cerebrum2. Cerebellum3. Medulla

Oblongata4. Hypothalamus5. Corpus

Callosum

A. Connects right and left side of brain.

B. Visceral homeostasis

C. Speech, reasoning, thought

D. Motor coordination

E. Survival functions

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

Obj. 17 Types of Nerves

Sensory – only sensory fibers

Motor – only motor fibersMixed – both sensory &

motor fibers

Obj. 18 Cranial Nerves

See fig. 13.1 diagram

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

Objective 19

Plexus----see diagram

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

Objective 22: Sympathetic/parasympathetic

Sympathetic system prepares the body for fight or flight

Parasympathetic prepares the body for rest and digestion.

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

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

Obj. 24 Taste

Four taste sensations are available:

Sweet

Sour

Bitter

Salty