Peripheral Nervous System - E4

Question 1

sensation

Answer 1

conscious or subconscious awareness of internal or external stimuli

requires: receptor - pathway - CNS interpretation

Question 2

ways to classify sensation

Answer 2

1. by location of stimuli
2. by stimulus type
3. by distribution of the senses

Question 3

receptors based on stimuli location

Answer 3

exteroceptors - at or near body surface; detect external stimuli

interoceptors - detect internal stimuli

proprioceptors - provide info about body position/movement

Question 4

receptors based on stimulus type

Answer 4

mechanoreceptors - respond to pressure/stretching

thermoreceptors - respond to temp; free nerve ends

nociceptors - pain; free nerve endings

photoreceptors - respond to light; rods and cones

chemoreceptors - respond to molecule changes

Question 5

receptors based on distribution

Answer 5

general senses are widely distributed

special senses are limited to specific sites

Question 6

tactile corpuscles

Answer 6

Meissner's corpuscles
in dermal papillae
c.t. capsule w/branching dendrites
flattened Schwann cells
detect light touch

Question 7

lamellar corpuscles

Answer 7

Pacinian corpuscles
deep dermis and subcutaneous
c.t. capsule w/nervous core with branching dendrites and flattened Schwann cells
respond to pressure and vibrations

Question 8

site of attachment and function for:
I-Olfactory
II-Optic
III-Oculomotor

Answer 8

I: olfactory bulb; smell
II: thalamus; vision
III: midbrain; eyeball/eyelid movement, pupil constriction, muscle sense

Question 9

site of attachment and function for:
IV-Trochlear
V-Trigeminal
VI-Abducens

Answer 9

IV: midbrain; eyeball movement, muscle sense
V: pons; chewing, muscle sense, facial sensation
VI: pons; eyeball movement, muscle sense

Question 10

site of attachment and function for:
VII-Facial
VIII-Vestibulocochlear
IX-Glossopharyngeal

Answer 10

VII: pons; muscles of facial expression, saliva and tear secretion, taste, muscle sense
VIII: pons, medulla oblongata; balance and hearing
IX: medulla oblongata; saliva secretion, taste, blood pressure regulation

Question 11

site of attachment and function for:
X-Vagus
XI-Accessory
XII-Hypoglossal

Answer 11

X: medulla oblongata; visceral smooth muscle control, digestive secretion, visceral sensations, muscle sense
XI: medulla oblongata?, anterior gray horns (C1-C5); head, neck, and should movement, swallowing, muscle sense
XII: medulla oblongata; tongue movement, muscle sense

Question 12

dorsal ramus vs ventral ramus

Answer 12

dorsal ramus nerves to the back of trunk

ventral ramus nerves to limbs and anterior/lateral trunk

Question 13

Spinal nerves

Answer 13

8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccygeal

Question 14

Dermatomes

Answer 14

areas of skin providing sensory input to a given nerve

not very accurate