D. intervertebral foramen E. foramen magnum. 13. There are A. eight B. twelve C.
ID: 3484128 • Letter: D
Question
D. intervertebral foramen E. foramen magnum. 13. There are A. eight B. twelve C. six D. five E. fourteen cervical spinal nerves. 14. Nerve fibers in the phrenic nerves that innervated the diaphragm arise primarily f plexuses? A. brachial B. cervical C. lumbar D. sacral E. cranial iapine A. ganglion. B. dermatome. C. cord D. plexus. E. nerve. 16. Dermatomal maps are important clinically because they A. can be used to check for motor function. B. locate the position of cranial nerves. C. can be used to help locate nerve damage. D. indicate what muscles are innervated by each spinal nerve. E. can be used to detect cranial nerve damage. 17. Which of the following is mismatch A. central nervous system- brain B. autonomic nervous system - sympathetic and parasympathetic divisions C. peripheral nervous system - spinal nerves D. somatic nervous system - sensory division of PNS E. peripheral nervous system - sensory and motorExplanation / Answer
the spinal nerves are divided into
cervical
thorasic
lumbar
sacral
coccygeal nerves
there are 8 pairs of cervical spinal nerves.c1 is sub occipital nerve,c2 is greater occipital nerve,c3 is third occipital nerve (c1-c4 is cervical plexues),(c5-T1) is brachial plexues.
14)phrenic nerve originate from c3-c5 nerves.it is mainly arise from c4 and get contribution from c3 and c5.c4 nerve belongs to cervical plexues so its main origin is cervical plexues.it passes posterior to the subclavian vein as it enters the thorax.it sends motar fibers to diagphragm, and sensory fibers to pericardium,pluera,peritonium of diaphragm.
15) ventral rami is the anterior division of spinal nerves.its branches are unite to form nerve plexues.they are cervical, thorasic,lumbar and sacral plexues.they inervate the sensory and motar signal in antero lateral thorax and limbs.
16)dermatome:the area of skin that is supplied by single spinal nerve.
drematomal map:it is the imaginary diagramatic representation of dermatoma on the human body.
in the clinical aspect these are helpful to detect the nerve damage.
17)the pheripheral nervous system include both spinal nerves and cranial nerves.
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