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20 Cards in this Set

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  • Back
What are the two types of muscle receptors?
Muscle spindles and golgi tendon organs
Which muscle receptor is made up of intrafusal fibers?
muscle spindle
Where are golgi tendons located?
in the tendon of a muscle
(Musculotendinous junction)- wrap around extrafusal muscle
How are muscle spindles and G.T.Os different?
Muscle spindles facilitate contractions 1A and 2B neurons

GTOs inhibit contractions- 1B neurons
What kind of efferent motor neuron goes to extrafusal muscle fibers
alpha
What test can you perform to check muscle spindle response?
knee jerk or tapping
Does a poly or monosynaptic stretch reflex involve inhibition?
Poly
This is caused by too much excitation of the alphamotor neuron and not enough inhibition motor neurons
Spasticity or hyperactive stretch reflex, Hypertonicity
What does response to palpitation and resistance to passive movement measure?
muscle tone.
Hyper vs Hypotonia
When a GTO inhibits motor response to the muscle it is part of, where does it send motor response?
to the agonist
Does every muscle in the body have an efferent pathway that is sometimes inhibited?
yes
Does the stretch reflex inhibit a muscle?
yes, the antagonist
Which two muscle receptors work together to control muscle stiffness?
Spindles and GTOs
Are there receptors in joints?
yes
Give the correct term for these types of receptors
Tactile, Temperature, Pain
Tactile- mechanoreceptors
Temperature- Thermoreceptors
Pain- Nocioreceptis
Name two main sensory tracts and be able to describe their ascent
Dorsal column
Spinothalamic Tract
Dorsal Column Tract Asecent
Information about 2pt discrimination, vibration sense, fine touch, and proprioception are picked up by specfic receptors in the body and sent up the periphearal nerve.

It is then delivered to the spinal nerve, to the dorsal root ganglion, to the dorsal root and then to the dorsal horn.

It goes up the spinal column to the medulla where is synapses with the second order neuron and it crosses.

From the medulla it continues up the pons, and up the midbrain, to the thalamus where it synapses on a thrid order neuron.

The third order neuron continues and delivers the informatio to area 3,1,2 for processing of the information
Spinithalamic Tract
information is picked up from receptors in the body about light touch, pain, and temperture and is sent up the periphearal nerve towards the spinal cord.

It enters the spinal nerve, then the dorsal root ganglion, the dorsal root, and then the dorsal horn. It synapses with a second order neuron in the dorsal horn where is crosses to the anterolateral column and ascends the spinal cord.

It goes up to the spinal cord and travels through the medulla, pons, and the midbrain, and up to the thalamus. In the thalamus it synapses with the third order neuron and then it goes to the 3, 1, 2 for processing.
Name one motor tract and name it's descent
Upper motor neurons from 50% of motor area 4, and 50% from premotor area 6 along with 3,1, 2 descend through the internal capsule, down the midbrain, the pons, and the medulla. 10% of the fibers continue straight down the anterior column while 90 cross to the other side of the medulla and then travel down the lateral column. Once the 90% reaches the appropriate spinal level and synapse on the LMN in the ventral horn. From the ventral horn the LMN leaves the spinal cord through the ventral root and out of the spinal nerve and then to the peripheral nerve that will take the information to the corresponding muscle fibers.

Corticospinal Tract
What Broadmann's areas are the relay areas for linking body part to body part?
5, 7 in parietal region