lab exam 4

Pacinian corpuscles naked nerve endings Merkel discs Ruffini's corpuscles Meissner's corpuscles Golgi tendon organs

1. high frequency vibration receptors 2. pain and temperature receptors 3. hair follicle receptors 4. deep pressure and stretch receptors 5. tactile receptors 6. stretch receptors

monosynaptic somatic superficial cord autonomic spinal polysynaptic

1. involve a sensory and motor neuron only 2. activate skeletal muscle 3. require intact upper motor pathways and spinal cord 4. activate smooth and cardiac muscle and glands 5. work well in decrebrate individuals 6. involve a sensory, motor and one or more interneuro

List the essential components of a reflex arc.

1. receptor 2. sensory neuron 3. integration center 4. motor neuron 5. effector

List the three types of sensory receptors.

exteroceptors, interoceptors, proprioceptors

CSF is produced in the arachnoid villi and removed from the system by the choroid plexus

false

Denticulate ligaments are the saw-toothed extensions of the dura mater that secure the spinal cord to the bony wall of the vertebral column all along its length

false

Humans have three dural falx, but sheep only have two, because they are missing the falx cerebri

false

In the ciliospinal reflex, both pupils constrict because of sympathetic impulses that are closely integrated

false

Like Broca's area, Wernicke's area is typically located in both cerebral hemispheres.

false

Meissner's corpuscles are located in the reticular layer of the dermis and respond to deep pressure

false

Sensory receptors act as transducers, changing environmental stimuli into efferent impulses, which are identified entirely by the area of the motor cortex that is stimulated

false

The largest nerve of the lumbar plexus is the ___________ nerve which innervates the anterior thigh muscles

femoral

Activation of the ___________ branch of the autonomic system inhibits digestive and reproductive functions

sympathetic

Activation of the sympathetic branch of the autonomic system inhibits digestive and reproductive functions

true

As a rule, the areas of the body that have the highest density of tactile receptors (like the lips) have the most sensitivity to touch.

true

In the cerebrum, the gray matter is on the exterior with white on the interior, but in the spinal cord, the white matter is on the exterior and the gray is on the interior.

true

Tactile localization and two-point thresholds are dependent on the density of touch receptors in the integument, and vary from one part of the body to another.

true

The diencephalon consists of the epithalamus, the thalamus and the hypothalamus

true

The largest nerve of the lumbar plexus is the femoral nerve which innervates the anterior thigh muscles

true

The parasympathetic, or craniosacral division of the autonomic system innervates structures of the head and neck, along with organs in the pelvic cavity

true

The patellar reflex is an example of a monosynaptic reflex.

true

The patellar, or knee-jerk reflex is an example of a stretch reflex, which normally acts to maintain posture, balance and locomotion

true

The thirty one pairs of spinal nerves arise from the fusion of the dorsal and ventral roots of the spinal cord

true

To test the Facial nerve (VII), the subject is asked to taste sweet, salty and sour foods, smile, close the eyes, and whistle.

true