Flashcards in Chapter 13 Deck (49)
The PNS detects ............. stimuli and delivers the information to the CNS as sensory input.
The CNS processes the input and transmits the impulse through the PNS to ............. cells and ............... as motor output.
muscle cells and glands
Summarize the function of the somatic sensory division.
detects stimuli of both general and special senses and sends it to CNS
Summarize the function of the visceral sensory division.
relays sensory info from organs in the abdominopelvic and thoracic cavities to the CNS
The sensory division consists of ............ neurons, whereas the motor division consists of .............. neurons
Generalize the function of the somatic motor division.
stimulate skeletal muscle contractions
Generalize the function of the visceral motor division (autonomic motor nervous system, ANS).
maintains homeostasis by controlling involuntary function. Stimulates cardiac and smooth muscle.
What is the sympathetic nervous system of the ANS (fight or flight division) involved in?
maintains homeostasis when the body is involved in any type of work. Mediates visceral responses to emotion.
What is the parasympathetic system of the ANS (rest and digest division) involved in?
digestion and maintaining homeostasis when body is at rest
What do mixed nerves contain?
both sensory and motor neurons
Sensory nerves contain only .............. neurons, while motor nerves contain mostly motor neurons and some ............... neurons involved in muscle stretch and tension.
Two collections of axons connect the PNS with the spinal cord's gray matter: the anterior root consists of ........... neurons from the anterior horn, and the posterior root consists of .............. neurons from the posterior horn.
How many pairs of spinal roots are there? True or false, they are all mixed nerves.
What is the function of the epineurium? What is the function of the perineurium? What is the function of the endoneurium?
1. binds bundles of fascicles into one spinal nerve
2. binds individual fascicles
3. binds the axons within a fascicle
spinal nerves are formed by the fusion of ?
anterior and posterior roots
The spinal nerve is short and divides into the following two mixed nerves ........... and .............
anterior ramus and posterior ramus
Thirty-one pairs of spinal nerves consist of .......... pairs of cervical nerves, .............. pairs of thoracic nerves, .............. pairs each of lumbar and sacral nerves, and one pair of coccygeal nerves.
8, 12, 5
The anterior rami of the cervical, lumbar, and sacral spinal nerves each merge to form complicated networks of nerves called
What do the branches of the cervical plexus serve?
sensory to the skin of chest, shoulder and ear, and motor to diaphragm and swallowing muscles
the phrenic nerve innervates the .......
Do Thoracic Spinal Nerves form plexuses?
no, except for T-1
What do nerve branches from the Lumbar plexuses innervate?
mainly the pelvis and lower extremity
The ............... nerve, the longest and largest nerve in the body, contains axons from both the anterior and posterior divisions of the sacral plexus. It travels through the greater sciatic notch in the pelvis into the thigh, passing between the greater trochanter and the ischial tuberosity. What does this nerve innervate?
sciatic, the hip joint, feeds into the fibular and tibial nerves
What are the 5 major nerves of the brachioplexus?
The anterior division of the Lumbar plexus's largest member is the .................. which enters the thigh from the pelvis via the obturator foramen. What do branches of this nerve innervate?
Obturator nerve. Adductors, hip joint and inner thigh skin
The posterior division of the Lumbar plexus's largest member, the ........... nerve, is the largest branch of the lumbar plexus. This nerve travel from the psoas, through the pelvis and under the inguinal ligament to enter the thigh. What does this nerve innervate?
Femoral nerve, Quads, knee, and skin of thigh
What do nerve branches from the Sacral plexus innervate?
pelvis, gluteal region, and much of the lower extremity.
What do the branches of the tibial nerve innervate?
hamstrings, knee, gastroc, ankle, and plantar flexor muscles
What does the common fibular nerve and its branches innervate?
knee and distal leg