Anatomy- The peripheral Nervous Sytem & Reflex Activity Flashcards
Sensory Receptors: Thermoreceptors
Response to temperature change.
Sensory Receptors: photoreceptors
Respond to light energy
Sensory receptors: Chemoreceptors
Respond to chemicals in solution(molecules smelled, tasted, change in blood pH)
Sensory Receptors: noicereceptors
Respond to pain from potentially damaging stimulus.
Exteroreceptors
Sensitive to stimuli arising outside body(touch, pressure, pain)
Interoreceptors
a sensory receptor that detects stimulus within the body.
Example: Blood Pressure
Proprioceptors
Respond to internal stimuli in skeletal muscle, tendons, joints
Nerve:
Cordlike organ of PNS consisting of bundles of axons enclosed in layers of connective tissue
Sensory(afferent) nerves
Carry impulses toward CNS
Motor(efferent) nerves:
Carries impulses away from CNS
Mixed nerves
Contains both motor and sensory
Peripheral nerves can be classified as____ or ______
Spinal nerves r or cranial nerves
Ganglia
Collections of neuron cell bodies associated with nerves in PNS
Sensory Receptors: Mechanoreceptors
Respond to touch, pressure(including blood pressure), vibration, stretch and itch.
Cranial Nerve: I.
I. Olfactory- purely sensory(associated with sense of smell)
Cranial Nerve: II
II. Optic Nerve
Sensory- deals with vision
Cranial Nerve: III
III. Oculomotor
- Motor- eye movement
Cranial Nerve: IV
IV. Trochlear
- motor-
Turns eye downward and laterally
Cranial Nerve V:
V. Trigeminal
Both
chewing face, mouth, touch & pain
Cranial Nerve VI.
VI. Abducens
Motor
Turns eyes laterally
Cranial Nerve VII:
VII. Facial - both - most facial expressions secretion of tears & saliva taste
Cranial Nerve: VIII.
VIII. Vestibulocochlear
- sensory-
hearing, balance
Cranial Nerve: IX
IX. Glossopharyngeal
- mixed- (taste, tongue, tonsil,muscles for swallowing)
Cranial Nerve: X
X. Vagus Both aortic blood pressure slows heart rate ,stimulates digestive organs, taste
Cranial Nerve: XI
XI. Accessorysenses
controls trapezius & sternocleidomastoid
controls swallowing movements
Motor
Cranial nerve: XII
XII. Hypoglossal
-controls tongue movements
Motor
Spinal Nerves: how many pairs?
31
Cervical Plexus:
Cranial Nerves C1-C5;supplies skin and muscles of head, neck, shoulders and chest.
Brachial Plexus:
Cranial nerves C5-T1
Supplies shoulders & upper limbs
Lumbosacral Plexus
Lower limb, breaches to pelvis, abdomen, & buttocks.
Lumbar Plexus
Spinal nerves L1-L4, supplies buttocks and lower limbs
Coccygeal plexus:
Spinal Nerves S4-Co Serves the coccyx bone
Reflexes: Somatic reflexes
Lead to contraction of skeletal muscles.
Reflexes: Autonomic (visceral) reflexes:
Lead to response from smooth muscle, cardiac muscle & glands.