lecture 3

Question 1

6 misconceptions of reflexes

Answer 1

simple responses, stereotyped, mediated by spinal cord or reflex arcs, repeatable and not acquired by learning

Question 2

not all reflexes are simple such as

Answer 2

coughing and sneezing - involves coordination of a large number of muscles

Question 3

some skeletomotor reflexes are somewhat stereotyped

Answer 3

eye blinks

Question 4

why are most reflexes not stereotyped

Answer 4

because reflexes are adapted to the conditions of execution

Question 5

example of reflexes that are not stereotyped

Answer 5

wiping reflex in frogs - responses differ on different occasion

Question 6

The brain is not

Answer 6

always necessary
eg mike the headless chicken
and decerebrate frog- headless frog

Question 7

headless frog experiment

Answer 7

eliciting stimulus - irritation at a location on the frogs skin by placing a piece of acid soaked paper on it

Question 8

response of the headless frog

Answer 8

movement involving extension of rear leg wiping the toes over the stimulus

Question 9

adaptability of the wiping reflex

Answer 9

food position depends upon the stimulus LOCATION

so reflex responses are NOT stereotyped

Question 10

reflex responses are NOT stereotyped because

Answer 10

they are able to achieve the same outcome (removal of the source of irritation) under DIFFERENT CIRCUMSTANCES(location, body posture and body condition

Question 11

NOT all reflexes are mediated by the SPINAL circuit

Answer 11

any reflexes that involve a sensory neurone in the head(ears, tongue,nose,eyes) involve neurons in the brain

Question 12

reflex eye movements

Answer 12

movement of the eye in its socket produced by the extra ocular muscles

Question 13

horizontal movements of an eye are produced by

Answer 13

contracting the medial and lateral recti

Question 14

medial rectus moves the eye

Answer 14

right

Question 15

Lateral rectus moves the eye

Answer 15

Left

Question 16

all the extra ocular muscles are driven by

Answer 16

motor neurons located in nuclei within the brainstem

Question 17

Media recti motor neurons are located within the

Answer 17

oculoMotor nuclei at midbrain level

Question 18

lateral rectified motor neurons are located within the

Answer 18

abducens nuclei at pontinelevel

Question 19

left abducens nuclei and right oculomotor nuclei moves

Answer 19

the eyes to the left

Question 20

right abducens nuclei and left oculomotor nuclei moves

Answer 20

the eye to the right

Question 21

eyes to the left

Answer 21

left abducens nuclei and right oculomotor nuclei

Question 22

the eye to the right

Answer 22

right abducens nuclei and left oculomotor nuclei