MSK Growth, Injury and Repair

Question 1

what is a motor unit

Answer 1

anterior horn cell located in grey matter of the spinal chord

Question 2

what is a sensory unit

Answer 2

cell bodies in posterior root ganglia

outside the spinal chord

Question 3

what are spinal nerve

Answer 3

anterior and posterior roots combine to form a spinal nerve

Question 4

what is a peripheral nerve

Answer 4

is the part of a spinal nerve distal to the nerve roots

Question 5

what are axons

Answer 5

coated in endoneuium grouped into fascicles

Question 6

what are fascicles

Answer 6

covered in perineurium which are grouped to form a nerve

Question 7

what are nerves

Answer 7

covered in epineurium

Question 8

what types of nerve injury can you get

Answer 8

compression

trauma- direct or indirect

Question 9

what types of compression can you get

Answer 9

entrapment
calssic- carpel tunnel
Mortons neuroma

Question 10

what types of trauma can you get

Answer 10

direct-blow or laceration

indrect- avulsion or traction

Question 11

what is neurapraxia

Answer 11

stretched or bruises- local ischaemia and demyelination

Question 12

what is axonotmesis

Answer 12

endoneuriumz in tact but disruption of axons

curshed

Question 13

what is neurotmesis

Answer 13

complete nerve division

Question 14

what is a closed nerve injury

Answer 14

spontaneous recovery is posstible
neurapraxia
axontemsis

Question 15

what is an open nerve injury

Answer 15

treated with surergy

neurotemsis

Question 16

what is the healing process of a nerve

Answer 16

starts with initial death of axons distal to the site of injury
regeneration is 1mm/day

Question 17

what is the surgical timing for nerve injuries

Answer 17

immediate surgery within 3 days for clean injuries
early surgery within 3 weeks for blune
delayed surgery within 3 months for closed injuries