Bio 253
Bio 253 Exam 2 Questions and Answers 2025
Dorsal root has what kind of fibers
Sensory Fibers (afferent)
Ventral Root has what kind of fibers
motor fibers (efferent)
Significance of the phrenic nerve
it's housed in the cervical plexus innervates the diaphragm
Which plexus houses the ulnar
Brachial plexus
The ramus is
large branches formed after each spinal nerve emerges from the spinal cavity.
The dorsal ramus supplies somatic motor and sensory fibers to smaller nerves that
innervate the muscles and skin of the posterior surface of the head, neck, and trunk.
Dermatome
Bio 253
,Bio 253
Region of the skin surface area supplied by afferent (sensory) fibers of a given spinal
nerve
Myotomes movement
Skeletal muscle or muscles supplied by efferent (motor) fibers of a given spinal nerve
How many cranial nerves are responsible for eye movement and what are they
3 they are Cranial Nerves III, IV, and VI (3,4,6)
cranial nerves
Oh Olfactory SENSORY
Oh Optic SENSORY
Oh Oculomotor MOTOR
To Trochlear MOTOR
Touch Trigeminal MIXED
And Abducens MOTOR
Feel Facial MIXED
Very Vestibulocochlear SENSORY
Good Glossopharyngeal MIXED
Vagina's Vagus MIXED
and Accessory MOTOR
Hymen Hypoglossal MOTOR
page:489 21-2
Bio 253
,Bio 253
What do cranial nerves contain
contains axons of sensory and motor neurons
Afferent
Afferent neurons are sensory neurons that carry nerve impulses from sensory stimuli
towards the central nervous system and brain
Efferent
are motor neurons that carry neural impulses away from the central nervous systme and
towards muscles to cause movement.
Reflex Arc
the nerve pathway involved in a reflex action including at its simplest a sensory nerve
and a motor nerve with a synapse between.
The somatic motor system includes all the __ motor pathways __ the CNS.
voluntary; outside
The dorsal root of each spinal nerve is easily recognized by a swelling called the
dorsal root ganglion.
Each skin surface area supplied by sensory fibers of a given spinal nerve is a
dermatome
Bio 253
, Bio 253
How many pairs of spinal nerves are connected to the spinal cord?
31
The lower end of the spinal cord, with its attached spinal nerve roots, gives the
appearance of a horse's tail called the
cauda equine.
Dendrites and cell bodies of sympathetic preganglionic neurons are located in the
gray matter of the thoracic and upper lumbar segments of the spinal cord.
We have an expert-written solution to this problem!
Acetylcholine binds to what kind of receptors.
cholinergic
The two main types of adrenergic receptors are
alpha and beta
The effect of sympathetic stimulation on the urinary bladder is
relaxation
The action of acetylcholine is quickly terminated by its being hydrolyzed by the enzyme
acetylcholinesterase.
If you trace the axon inside the sympathetic chain ganglion, the preganglionic fiber
branches along which pathway?
sends ascending or descending branches through the sympathetic trunk to synapse with
postganglionic neurons in other chain ganglia
passes through one or more ganglia without synapsing, synapses with a sympathetic
postganglionic neuron
preganglionic
Release Ach
Bio 253
Bio 253 Exam 2 Questions and Answers 2025
Dorsal root has what kind of fibers
Sensory Fibers (afferent)
Ventral Root has what kind of fibers
motor fibers (efferent)
Significance of the phrenic nerve
it's housed in the cervical plexus innervates the diaphragm
Which plexus houses the ulnar
Brachial plexus
The ramus is
large branches formed after each spinal nerve emerges from the spinal cavity.
The dorsal ramus supplies somatic motor and sensory fibers to smaller nerves that
innervate the muscles and skin of the posterior surface of the head, neck, and trunk.
Dermatome
Bio 253
,Bio 253
Region of the skin surface area supplied by afferent (sensory) fibers of a given spinal
nerve
Myotomes movement
Skeletal muscle or muscles supplied by efferent (motor) fibers of a given spinal nerve
How many cranial nerves are responsible for eye movement and what are they
3 they are Cranial Nerves III, IV, and VI (3,4,6)
cranial nerves
Oh Olfactory SENSORY
Oh Optic SENSORY
Oh Oculomotor MOTOR
To Trochlear MOTOR
Touch Trigeminal MIXED
And Abducens MOTOR
Feel Facial MIXED
Very Vestibulocochlear SENSORY
Good Glossopharyngeal MIXED
Vagina's Vagus MIXED
and Accessory MOTOR
Hymen Hypoglossal MOTOR
page:489 21-2
Bio 253
,Bio 253
What do cranial nerves contain
contains axons of sensory and motor neurons
Afferent
Afferent neurons are sensory neurons that carry nerve impulses from sensory stimuli
towards the central nervous system and brain
Efferent
are motor neurons that carry neural impulses away from the central nervous systme and
towards muscles to cause movement.
Reflex Arc
the nerve pathway involved in a reflex action including at its simplest a sensory nerve
and a motor nerve with a synapse between.
The somatic motor system includes all the __ motor pathways __ the CNS.
voluntary; outside
The dorsal root of each spinal nerve is easily recognized by a swelling called the
dorsal root ganglion.
Each skin surface area supplied by sensory fibers of a given spinal nerve is a
dermatome
Bio 253
, Bio 253
How many pairs of spinal nerves are connected to the spinal cord?
31
The lower end of the spinal cord, with its attached spinal nerve roots, gives the
appearance of a horse's tail called the
cauda equine.
Dendrites and cell bodies of sympathetic preganglionic neurons are located in the
gray matter of the thoracic and upper lumbar segments of the spinal cord.
We have an expert-written solution to this problem!
Acetylcholine binds to what kind of receptors.
cholinergic
The two main types of adrenergic receptors are
alpha and beta
The effect of sympathetic stimulation on the urinary bladder is
relaxation
The action of acetylcholine is quickly terminated by its being hydrolyzed by the enzyme
acetylcholinesterase.
If you trace the axon inside the sympathetic chain ganglion, the preganglionic fiber
branches along which pathway?
sends ascending or descending branches through the sympathetic trunk to synapse with
postganglionic neurons in other chain ganglia
passes through one or more ganglia without synapsing, synapses with a sympathetic
postganglionic neuron
preganglionic
Release Ach
Bio 253
