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Mass of unmyelinated nerve cell bodies and dendrites within CNS: unlike ganglia which is outside CNS
Transparent, fibrous membrane; adheres to outer surface of cord and brain; contains blood vessels (nutritive layer) On the brain, down into the groove really adheres. Can't remove it.
Area between arachnoid and pia mater-- contains cerebrospinal fluid. Nutrients and stuff move through this fluid.
Thickenings of pia mater in spinal cord; project laterally and fuse with dura mater between ventral and dorsal nerve roots and spinal nerves.
Aka Conus Medullaris. This is below the lumbar enlargement of the spinal cards where it tapers to ____ ____ between 1st and 2nd lumbar
This is an extension of the pia mater and arises from the conus medullaris which is where the spinal cord tapers
Tail like collection of roots of spinal nerves at inferior end of cord. Large collection of nerves, runs through the holes of the vertebrae
Sensory information is carried over _____ tracts carry impulses for pain, temp, crude touch, and deep pressure.
Sensory information is carried over ______ _____ tracts (fasciculus gracilis and fasciculus cuneatus) carry impulses for porprioception, discriminating touch, pressure and vibrations.
Motor Information is carried over _____ tracts (corticospinal and corticobulbar) convey impulses for precise voluntary movements of skeletal muscles.
Motor information is carried over _______ tracts (rubrospinal, tectospinal, and vestibulospinal) they carry impulses for autonomic movements, tone and posture, equilibrium, coordinate body movements with visual stimuli.
This is a fast response to changes in stimuli in internal or external environment allowing the body to maintain homeostasis. So rapid it doesn't have to reach the brain.
____ reflexes cause contraction of smooth or cardiac muscle. also called autonomic reflexes.
In a reflex arc the impulse ends with an _____ which is usally a muscle or glandular cell.
The _____ _____ of a reflex arc are regions of gray matter in CNS that connect sensory and motor neurons.
Two-neuron or monosynaptic reflex arc are the _____ arc faster. Because there is only one sensory neuron and one motor neuron.A muscle is stretched -> muscle spindles -> impulses to spinal cord. The sensory neuron synapses with motor sends impulse to muscle for contraction.
A _____ reflex arc has at least one sensory neuron, synapse, association neuron, and motor neuron. May involve intersegmental reflex arc.
The _____ reflex arcs exist such as crossed extensor reflex. Step on a tac and you hop on the other foot
Spinal nerves originate by anterior and posterior roots from cord, emerge through ____ _____; spinal ganglion on each posterior root.
After passing though intervertebral foramen spinal nerves divide into several branches. One example is ___ ___ which serves deep muscles and skin of dorsal surface of trunk
This Branch serves muscles and structures of upper and lower extremities and lateral and ventral trunk.
This branch reenters spinal canal and supplies vertebrae, vertebral ligaments, blood vessels of cord and meninges.
Part of the ventral rami the ____ plexus is first 4 cervical nerves and supply skin and muscles of head, neck and upper part of shoulders. (phrenic- major nerve that goes to your diaphragm)
Part of the ventral rami the ___ plexus is spinal nerves C5-C8 and T1; nerve supply for upper extremities and should region. (median, ulnar, radial)
The ____ plexus is the part of the ventral rami that is spinal nerves L1-L4; supplies anterolateral abdominal wall, external genitalia, and part of lower extremity (femoral, obturator- abductor muscles of leg)
_____ Plexus is the part of the ventral rami that is spinal nerves L4-L5 and S1-S4; supplies buttocks, perineum, and lower extremities (sciatic) hamstrings
The skin segment supplies by dorsal root of a spinal nerve. They can tell what nerve we may be having problems with.
C5-C7. Coracobrachialis, biceps brachii, and brachialis muscles (anterior muscles of the arm). Brachial Plexus.
C5-T1. Supplies most of the muscles of the anterior forearm and some of the muscles in the hand. Brachial Plexus
C8-T1. Supplies the anteromedial muscles of the forearm and most of the muscles of the hand. Brachial Plexus
L2-L4. Supplies flexor muscles of hip joint and extensor muscles of knee joint, skin over anterior and medial aspect of thigh and medial side of leg and foot. Lumbar Plexus
L4-S3. Tibial and common fibular bound together by common sheath; sends branches to hamstring muscles and adductor magnus. sacral plexus.
L4-S3. Gastrocnemius, plantaris, soleus, popliteus, branches of tibial nerve in foot are medial plantar nerve and lateral plantar nerve. Sacral Plexus.
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