Unit 6 Day 8
If you want an
accounting of your
worth, count your
friends.
Merry Browne
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-shockabsorbing fluid surrounding the brain
and spine.
 Blood-brain barrier-capillaries
impermeable to many substances.
This protects the brain and spine
from infection.
Objective 14
 Concusion—head
injury causing
reversible damage.
 Contusion—head
injury causing
irreversible
damage.
Anterior grey horn
White matter
Dorsal ganglion
Posterior grey horn
Central canal
Dorsal root
Ventral root
Spinal nerve
Obj. 15
Obj. 11-15 Practice: Find the error
1.
2.
3.
4.
Meninges are found in the brain,
spinal cord, and all nerves.
The cerebrospoinal fluid cushions
sinovial joints.
Bacteria frequently pass through the
blood brain barrier.
Contusions are reversible head
injuries.
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

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 fibers
Mixed – 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