quiz questions exam 3 Flashcards
what are the unique properties of neurons?
1) Depolarization
2) propagation
3) transmission of neural impulse
what are the three types of neuroactive substances based on the manner of action?
1) Neurotransmitters
2) neuromodulators
3) neurohormones
based on manner of action, define neurotransmitter.
A neuroactive substance acting rapidly and locally on a target cell
what is the name given to the major cellular mass of a neuron?
The cell body, soma or perikaryon
what are the basic morphologies of neurons?
Unipolar
bipolar
pseudounipolar
multipolar
what are the possible locations of bipolar neurons?
1) nasal olfactory epithelium
2) retina
3) vestibular or Scarpa’s ganglion
4) cochlear or spiral ganglion
what are the possible lacations of pseudounipolar neurons?
Any sensory ganglion other than those of the eigth cranial nerve
where is the primary sensory neuron of a typical sensory pathway located?
In a sensory ganglion
what is the morphology of most motor or efferent neurons associated with the peripheral nerve system?
Multipolar
what are the three classifications of sensory receptor endings?
1) Functional specificity
2) distribution-function
3) structure or morphology
What do chemoreceptors do?
Hypoxia or decreased oxygen levels, hypercapnia or increased carbon dioxide levels and elevated hydrogen ions, an indication of circulating blood pH
What are the types and examples of exteroceptors?
1) general or cutaneous sense organs such as free nerve endings, encapsulated endings and epidermal endings
2) special sense receptors for olfaction, vision, hearing, and taste
what are the examples of proprioceptors?
1) Golgi tendon organs
2) neuromuscular spindles
3) pacinian corpuscles
4) inner ear receptors for equilibrium
5) specialized receptors in joints
where will the interoceptors be located?
1) viscera
2) glands
3) blood vessels
which type of encapsulated nerve ending is sensitive to vibration?
Lamellated corpuscles or pacinian corpuscles
what are the primary neuronal projections observed in a nerve?
Peripheral sensory processes and motor nerve fibers
muscles derived from somites are innervated by which cranial nerves?
Cranial nerve III or oculomotor nerve,
cranial nerve IV or trochlear nerve, cranial nerve VI or abducens nerve
cranial nerve XII or hypoglossal nerve
Muscles derived from the branchial or pharyngeal arches are innervated by which cranial nerves?
Cranial nerve V or trigeminal nerve
cranial nerve VII or facial nerve
cranial nerve IX or glosssopharyngeal nerve
cranial nerve X or vagus nerve
cranial nerve XI or spinal accessory nerve
What peripheral nerves contain visceral efferent pathways at their origin?
Cranial nerve III or occulomotor nerve cranial nerve VII or facial nerve cranial nerve IX or glossopharyngeal nerve cranial nerve X or vagus nerve spinal nerves T1-T12, L1, L2 and S2-S4
What is the location for the secondary sympathetic efferent neuron cell body
A prevertebral ganglion or paravertebral ganglion
What are the ultimate target cells of the visceral efferent pathways?
Smooth muscle
cardiac muscle
glandular tissue
specialized cell types
Primary parasympathetic efferent neurons will be associated with which cranial nerves?
Cranial nerve III or oculomotor nerve
cranial nerve VII or facial nerve
cranial nerve IX or glossopharyngeal nerve
cranial nerve X or vagus nerve
What is the name given to and neuroactive substance associated with postganglionic parasympathetic efferent fibers
Cholinergic fibers; acetylcholine
What types of efferent neurons form nuclei of origin in the brain?
Somatic neurons
branchial neurons
primary parasympathetic neurons
Will sympathetic efferent neurons be located in the brain?
no
What are the four classifications of afferent neurons?
Somatic afferent
visceral afferent
special visceral afferent
special sensory
What do somatic afferents monitor?
Pain
temperature
light touch
proprioception
What do visceral afferents monitor?
Baroreception
chemoreception
sensation from viscera
What do special visceral afferents monitor?
Olfaction and taste
What do special sensory afferents monitor?
Vision
hearing
equilibrium
what is unusual about the receptor ending of th eprimary olfactory neuron?
it is an olffactory knob covered with olfactory cilia
what forms the true olfactory nerve?
fila olfactoria
what is the location for the synapse between primary and secondary afferent neurons of the first cranial nerve?
olfactory glomerulus
what is teh name of the traditional secondary afferent neuron of the first cranial nerve?
mitral cell
what is the functoin of the rod cell?
provide vision in dim light conditions
what is the function of the cone cell?
provide vision in bright light conditions and mediate color vision
what is the most numerous photoreceptor cell?
rod cell
what foms the optic nerve?
axons of ganglion cells
waht occurs at the optic chaisma?
part of the optic nerve decussates
axons carried in the second cranial nerve will synapse in what specific location?
lateral geniculate body
at its apparent orgin, cranial nerve III conveys which classifications of neural pathways?
1) somatic efferent pathway
2) visceral efferent pathway
what is the somatic efferent nucleus of origin for the third cranial nerve?
oculomotor nuclear complex
what is/are the target organs for the somatic efferent fibers carreid in the third cranial nerve?
1) medial rectus
2) inferior rectus
3) superior rectus
4) inferior oblique extrinsic muscles of the eyeball
5) levator palpebrae superioris muscle of the eyelid
visceral efferent fibers conveyed in the third cranial nerve originate from which nucleus?
accessory oculomotor nucleus of Edinger/Westphal