Anatomy - Spinal Nerves Flashcards
what does each pair of spinal nerves supply?
one segment of the body wall
what do each pair of spinal nerves supply a body wall segment with?
somatic general sensory
somatic motor
sympathetic motor
reflex functions
what area is test to test the motor function of a spinal nerve?
myotome
what area is tested to test the sensory function of a spinal nerve?
dermatome
what is tested to test motor and sensory function of a spinal nerve at the same time?
spinal cord reflexes
what can spinal nerve testing be used to determine?
the location of a pathology
where is the nerve point of the neck located?
just above the midpoint of the posterior border of the SCM
what group of nerves arise at the nerve point of the neck?
the sensory nerves of the cervical plexus
what nerve supply the posterior parts of the back dermatomes?
the posterior rami
what myotome is tested by abduction of the shoulder joint?
C5
deltoid
what myotome is tested by adduction of the shoulder joint?
C7
pectoralis major and latissimus dorsi
what myotome is tested by flexion of the finger joints?
C8
digit flexors
what myotome is tested by extension of the finger joints?
C7
(digit extensors(
what myotome is tested by abduction of the finger joints?
T1
dorsal interossei
what myotome is tested by adduction of the finger joints?
T1
palmar interossei
what myotome is tested by flexion of the elbow joint?
C5 and C6
biceps brachii
what myotome is tested by extension of the elbow joint?
C7 and C8
triceps brachii
what myotome is tested by flexion of the wrist joint?
C6 and C7
carpal flexors
what myotome is tested by extension of the wrist joint?
C6 + C7
carpal extensors
what myotome is tested by flexion of the hip joint?
L2 and L3
psoas major
what myotome is tested by extension of the hip joint?
L5 and S1
gluteus max and hamstrings
what myotome is tested by flexion of the knee joint?
L5 and S1
hamstrings
what myotome is tested by extension of the knee joint?
L3 and L4
hamstrings
what myotome is tested by dorsiflexion of the ankle?
L4 and L5
tibialis anterior
what myotome is tested by plantar flexion of the ankle?
S1 and S2
gastrocnemius and soles
what myotome is tested by inversion of the ankle?
L4
(tibialis anterior and posterior
what myotome is tested by eversion of the ankle joint?
L5 and S1
fibulas Longus and brevis
what is a reflex?
an involuntary response to a stimulus
what makes a muscle paralysed?
when it doesn’t have a functioning motor nerve supply and cannot contract
what would be seen on examination of a paralysed muscle?
reduced tone
what makes a muscle spastic?
descending controls from the brain not working
what is seen on examination of a spastic muscle?
increased tone
