Anatomy of spinal nerves Flashcards
Where is C2 dermatome located?
back of scalp and adams apple
Where is C3 dermatome located?
back of neck and jugular notch
Where is C4 dermatome located?
clavicle and shoulder tip
Where is the C5 dermatome located?
badge patch
Where is the C6 dermatome located?
thumb
Where is the C7 dermatome located?
middle finger
Where is C8 dermatome located?
little finger
Where is T1 located?
medial forearm
Where is T2 dermatome located?
medial arm and sternal angle
Where is T4 dermatome located?
male nipple
where is T10 dermatome located?
umbilicus
Where is T12 dermatome located?
pubic symphysis
Where is L1 dermatome located?
groin
Where is L2 dermatome located?
anterior thigh
Where is L3 dermatome located?
anterior knee
Where is L4 dermatome located?
medial malleolus
Where is L5 dermatome located?
dorsum of foot
Where is S1 dermatome located?
heel
Where is S2 dermatome located?
posteiror knee
Where is S3 dermatome located?
buttock
Where is S4 dermatome located?
perineum
Where is S5 dermatome located?
perianal skin
Where is the nerve point of neck?
just above midpoint of posterior border of SCM
What are the branches of the cervical plexus?
lesser occipital (C2); great auricular nerve(C2,3); transverse cervical (C2,3) and supraclavicular (C3,4) nerves
What is the only spinal nerve that does any facial sensation?
greater auricular nerve
What is the cutaneous innervation of the posteiror neck?
posteiror rami of spinal nerves C2-C8
What is the cutaneous innervation of the upper anterolateral trunk ?
intercostal nerves
What nerves innervate the lower anterolateral trunk wall?
iliohypogastric and ilioinguinal nerves
What supplies the anatomical snuffbox?
radial nerve
What innervates the medial arm and forearm?
T1 and T2 anterior rami
What muscles do nerves of the cervical plexus innervate?
neck postural and strap muscles; diaphragm
What muscles do nerves of the brachial plexus innervate?
muscles of the upper limb; extrinsic back muscles
What muscles do T2-L3 innervate?
postural back muscles; intercostal muscles and anterolateral abdo wall
What muscles do nerves of the lumbosacral plexus innervate?
lower limb and perineal skeletal muscles
What muscle does C5 innervate?
deltoid
How do you test C5 myotome?
abduction
What muscles does C7 innervate?
pec. major and latissimus dorsi
How do you test C7 myotome?
adduction
What muscles does C8 innervate in the hand?
digit flexors
What muscles does C7 innervate in the hand?
digit extensors
What muscles does T1 innervate?
dorsal and palmar interossei
What nerve innervates biceps?
C5,6
What nerves innervate triceps brachii?
C7,8
What nerves innerate the carpal flexors?
C6,7
What nerves innervate the carpal extensors?
C7,8
What nerves innerate psoas major?
L2,L3
What nerves are involved in hip flexion?
L2,3
What nerves are involved in hip extension?
L5,S1
What nerves are invovled in knee flexion?
L5,S1
What nerves are invovled in knee extension?
L3,4
What nerves are invovled in dorsiflexion?
L4,5
What nerves are invovled in plantar flexion?
S1,2
What nerve is involved in inversion?
L4
What nerve is involved in eversion?
L5,S1
What spinal nerve is involved in the brachial reflex?
C5
What spinal nerve is involved in supinator/brachioradialis reflex?
C6
what nerve is involved in trceps reflex?
C7
What nerve is tested by knee reflex?
L4
What nerve is tested by ankle reflex?
S1
biceps jerk?
C5/C6
supinator jerk (brachioradialis)
C5/C6
triceps jerk?
C6/C7
quadriceps jerk?
L3/L4
achilles tendon jerk?
S1/S2
should abduction?
C5
shoulder adduction?
C5-7
elbow flexion?
C5,6
elbow extension
C7
wrist flexion?
C7-8
wrist extension?
C7
finger flexion?
C8
finger extension?
C7
finger abduction?
T1
hip flexion?
L1,2
hip adduction?
L2,3
hip extension?
L5-S1
knee flexion?
L5-S1
knee extension?
L3,4
ankle dorsiflexion?
L4
ankle eversion?
L5-S1
ankle plantar flexion?
S1,2
big toe extension?
L5
