Exam 2 - BIOS252 / BIOS 252 (Latest 2024 /
2025) : Anatomy And Physiology II With Lab -
Chamberlain
How many pairs of spinal nerves are there? - ANSWER
31 pairs
how many cervical nerves are there? - ANSWER 8 pairs
how many thoracic nerves are there? - ANSWER 12
pairs
how many pairs of lumbar nerves are there? - ANSWER
5 pairs
,how many pairs of sacral nerves are there? - ANSWER 5
pairs
how many pairs of coccygeal nerves are there? - ANSWER
1 pair
What is the dorsal root? - ANSWER axons of sensory
neurons
what is the ventral root? - ANSWER axons of motor
neurons ( efferent)
Do spinal nerves contain both sensory and motor neurons? - ANSWER
yes
,What is a myotome? - ANSWER specific muscle groups
innervated by specific levels of spinal nerves
what is a dermatome? - ANSWER specific patches of
skin innervated by specific levels of the spinal column
what is a endoneurium? - ANSWER connective tissue
surrounding each individual axon
What is the perineurium? - ANSWER connective tissue
that surrounds a bundle of axons making a nerve fascicle
What is the epineurium? - ANSWER surrounds the
entire nerve
What is the cervical plexus? - ANSWER C1-C5
, what is notable nerves? - ANSWER Phrenic Nerve (C3-
C5)
brachial plexus - ANSWER C5-T1, nerves to upper limb,
neck, and shoulder muscles
lumbar plexus - ANSWER L1-L4, nerves to abdominal
wall, genitals, and lower limb
sacral and coccygeal plexus - ANSWER l5-s1, nerves to
the buttock, perineum, and lower limb notable nerves; sciatic nerve, tibial and
common fibular
what is a reflex? - ANSWER fast, involuntary and
predictable sequence of events that function as an arc
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