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Chamberlain University-Illinois
BIOS 252
BIOS 252 Exam 2 Questions and Answers
2026 Latest Update
How many pairs of spinal nerves are there? Ans: 31 pairs
How many pairs of cervical nerves are there? Ans: 8 pairs
How many pairs of thoracic nerves are there? Ans: 12 pairs
How many pairs of lumbar nerves are there? Ans: 5 pairs
How many pairs of sacral nerves are there? Ans: 5 pairs
How many pairs of coccygeal nerves are there? Ans: 1 pair
What are the 5 divisions of spinal nerves? Ans: cervical, thoracic, lumbar,
sacral, coccygeal
What type of neuron is the dorsal root? Ans: Sensory (afferent)
What type of neuron is the ventral root? Ans: Motor (efferent)
Do spinal nerves contain sensory or motor neurons? Ans: Both
What are myotomes? Ans: specific muscle groups innervated by specific
levels of spinal nerves
What are dermatomes? Ans: specific patches of skin innervated by specific
levels of the spinal column
What is the endoneurium? Ans: connective tissue surrounding each
individual axon
What is the perineurium? Ans: connective tissue surrounding a bundle of
axons making a nerve fascicle
What is the epineurium? Ans: connective tissue surrounding the entire nerve
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What areas does the cervical plexus serve? Ans: head and neck
Where is the phrenic nerve located? Ans: C3-C5
What does the phrenic nerve do? Ans: innervates the diaphragm
What is the cervical plexus made of? Ans: roots and nerves
What nerves are a part of the cervical plexus? Ans: C1-C4
What nerves make up the brachial plexus? Ans: C5-T1
What areas does the brachial plexus innervate? Ans: upper limbs, neck, and
shoulder muscles
What makes up the brachial plexus? Ans: roots, trunks, divisions, cords,
branches
What does the radial nerve do? Ans: provides motor function to the arm,
wrist, and hand
Where is the radial nerve located? Ans: brachial plexus
What does the median nerve do? Ans: provides motor function to the
forearm, wrist, and hand and sends touch, pain, and temperature signals
from the lower arm and hand to the brain
What does the ulnar nerve innervate? Ans: flexor carpi ulnaris and flexor
digitorum profundus
What nerves make up the lumbar plexus? Ans: L1-L4
What does the lumbar plexus innervate? Ans: abdominal wall, genitals, and
lower limb
What makes up the lumbar plexus? Ans: roots and divisions
What does the lateral cutaneous nerve innervate? Ans: skin of lateral thigh
What does the femoral nerve do? Ans: sensation to lower medial thigh and
leg, extends the knee and flexes the hip
What nerves make up the sacral plexus? Ans: L4-L5 and S1-S4
© 2026 All rights reserved
Chamberlain University-Illinois
BIOS 252
BIOS 252 Exam 2 Questions and Answers
2026 Latest Update
How many pairs of spinal nerves are there? Ans: 31 pairs
How many pairs of cervical nerves are there? Ans: 8 pairs
How many pairs of thoracic nerves are there? Ans: 12 pairs
How many pairs of lumbar nerves are there? Ans: 5 pairs
How many pairs of sacral nerves are there? Ans: 5 pairs
How many pairs of coccygeal nerves are there? Ans: 1 pair
What are the 5 divisions of spinal nerves? Ans: cervical, thoracic, lumbar,
sacral, coccygeal
What type of neuron is the dorsal root? Ans: Sensory (afferent)
What type of neuron is the ventral root? Ans: Motor (efferent)
Do spinal nerves contain sensory or motor neurons? Ans: Both
What are myotomes? Ans: specific muscle groups innervated by specific
levels of spinal nerves
What are dermatomes? Ans: specific patches of skin innervated by specific
levels of the spinal column
What is the endoneurium? Ans: connective tissue surrounding each
individual axon
What is the perineurium? Ans: connective tissue surrounding a bundle of
axons making a nerve fascicle
What is the epineurium? Ans: connective tissue surrounding the entire nerve
© 2026 All rights reserved
, 2 | Page
What areas does the cervical plexus serve? Ans: head and neck
Where is the phrenic nerve located? Ans: C3-C5
What does the phrenic nerve do? Ans: innervates the diaphragm
What is the cervical plexus made of? Ans: roots and nerves
What nerves are a part of the cervical plexus? Ans: C1-C4
What nerves make up the brachial plexus? Ans: C5-T1
What areas does the brachial plexus innervate? Ans: upper limbs, neck, and
shoulder muscles
What makes up the brachial plexus? Ans: roots, trunks, divisions, cords,
branches
What does the radial nerve do? Ans: provides motor function to the arm,
wrist, and hand
Where is the radial nerve located? Ans: brachial plexus
What does the median nerve do? Ans: provides motor function to the
forearm, wrist, and hand and sends touch, pain, and temperature signals
from the lower arm and hand to the brain
What does the ulnar nerve innervate? Ans: flexor carpi ulnaris and flexor
digitorum profundus
What nerves make up the lumbar plexus? Ans: L1-L4
What does the lumbar plexus innervate? Ans: abdominal wall, genitals, and
lower limb
What makes up the lumbar plexus? Ans: roots and divisions
What does the lateral cutaneous nerve innervate? Ans: skin of lateral thigh
What does the femoral nerve do? Ans: sensation to lower medial thigh and
leg, extends the knee and flexes the hip
What nerves make up the sacral plexus? Ans: L4-L5 and S1-S4
© 2026 All rights reserved
