Nerves/ Innervations Flashcards
What are the roots of the median, radial and ulnar nerve respectively?
C5-T1, C5-T1, C8-T1
What does the median nerve innervate?
- Flexor muscles in anterior compartment of forearm,
(except flexor carpi ulnaris & part of flexor digitorum, profundus) - thenar muscles (palmar side) + lateral two lumbricals of the hand + 1/2 of 3rd lumbrical.
- nail bed of thumb, 1st finger, 2nd finger
- LOAF
L - lumbricals
O - opponens pollicis
A - abductor pollicis brevis
F - flexor pollicis brevis
What does the radial nerve innervate?
- Triceps brachii - medial, lateral, long head.
- majority of forearm extensors (posterior forearm component)
Muscles that radial nerve innervates
- Triceps
- Brachioradialis
- Anconeus
- Extensor carpi radialis longus
Deep Branch
- extensor carpi radialis brevis
- supinator
Posterior interosseous nerve
- extensor digitorum
- extensor digiti minimi
- extensor carpi ulnaris
- abductor pollicis longus
What does LOAF stand for?
lumbricals
opponens pollicis
abductor pollicis brevis
flexor pollicis brevis
Anterior abdominal wall innervation
T7-T12 to all three anterior muscles,
L1 to oblique muscles as well
Posterior abdominal wall innervation
Mostly branches of lumbar plexus, (L1-L4) and subcostal nerve (Th12)
What nerves form the lumbar plexus?
The anterior roots of first four lumbar nerves (L1-L4) with contributions of the subcostal nerve (T12)
What lumbar nerves does the femoral nerve originate from?
L2-L4
What muscles are supplied by the dorsal scapular nerve? (3)
Levator scapulae
rhomboids major
rhomboids minor
What muscles are supplied by the Phrenic nerve?
Diaphragm
In the thorax, each phrenic nerve supplies the mediastinal pleura and pericardium.
What muscles are supplied by the suprascapular nerve?
supraspinatus muscle
infraspinatus muscle
What muscles are supplied by the subscapular nerve?
subscapularis
teres major
What muscles are supplied by thoracodorsal nerve?
Latissimus dorsi
What muscles are supplied by the axillary nerve?
deltoid muscle
teres minor muscle
What muscles are supplied by the radial nerve?
all posterior muscle compartment of arm and forearm.
also - a posterior cutaneous contribution to arm/ forearm/ hand/ lower lateral aspect of arm
what does the musculocutaneous nerve innervate?
biceps brachii
coracobrachialis
brachial is (flexor, attached to ulna)
what nerve innervates the tensor fascia latae?
superior gluteal nerve (L4, S1)
what nerve innervates the psoas and iliacus?
+ insertion point?
Lumbar plexus
Lesser trochanter of femur
what innervates the adductor magnus?
It is a composite muscle as the adductor and hamstring portions of the muscle are innervated by two different nerves. The adductor portion is innervated by the posterior division of the obturator nerve while the hamstring portion is innervated by the tibial nerve.
what innervates the hamstrings?
sciatic nerve
what innervates the quadriceps femoris, and sartorius
femoral nerve
what innervates the external obturator, and MOST adductors of the hips
obturator nerve
what supplies the iliopsoas?
lumbar plexus
what supplies the pectineus muscle?
It is a composite muscle as the innervation is by the femoral nerve (L2 and L3) and occasionally (20% of the population) a branch of the obturator nerve called the accessory obturator nerve.
what supplies the internal obturator?
sacral plexus
what muscles does the sacral plexus supply?
piriformis
quadratus femoris
internal obturator
what supplies the gluteus maximus?
inferior gluteal nerve
what does the external obturator supply?
external obturator
all adductors except part of adductor magnus (tibial nerve) and part of pectineus (shared with femoral nerve)
what are the 5 main peripheral nerves of the brachial plexus?
ulnar median musculocutaneous axillary radial
what spinal segment is the brachial plexus?
C5 to T1
what is another name for the roots of the brachial plexus?
anterior primary rami
what are the main peripheral nerves of the lumbar sacral plexus? (4-5)
femoral
obturator
sciatic - tibial and peroneal
pelvic nerves
what is the pain function of the obturator nerve?
hip adduction (bringing the legs together)
what is the main function of the femoral nerve?
activates the quadriceps, therefore extends the leg
what is the pain function of the sciatic nerve?
activates the hamstrings (except for one), therefore is used for knee flexion
