random stuff2 Flashcards
the lumbosacral plexus consists of the intermingling of primary branches of spinal nerves ___ thru ___
L4-S4
femoral n. spinal nerve origin
L4-L6
obturator n. spinal nerve origin
L4-L6
sciatic n. spinal nerve origin
L6-S2
pudendal n. spinal nerve origin
S2 - S4
the femoral nerve has a cutaneous branch named the ______ nerve
saphenous
the sciatic nerve branches into 2 nerves:
tibial and common peroneal
the common peroneal n branches into 2 nerves:
superficial and deep peroneal
the deep peroneal n branches into the ____ nerve distally
lateral dorsal metatarsal n.
name the 3 branches of the tibial nerve
caudal cutaneous sural n (runs with lateral saphenous v.), medial and lateral plantar nerves (on the medial side)
femoral nerve innervates:
flexors of the hip (iliopsoas, rectus femoris) and the extensors of the stifle (quadriceps femoris)
the cutaneous saphenous nerve innervates:
the skin of the medial thigh, medial crus, dorsomedial skin of the tarsus and metatarsus
clinical signs of femoral nerve laceration:
inability to support weight due to paralysis of quadriceps femoris, analgesia over the medial crural region
obturator nerve innervates:
adductors of the hip (pectineus, adductor, graciclis, external obturator) PAGE
T/F: the obturator nerve has a cutaneous portion
False
cranial gluteal nerve innervates:
abductors of the hip and the tensor fasciae latae m.
T/F: the cranial gluteal nerve has a cutaneous portion
False
what joint does the cranial gluteal nerve innervate?
hip joint
clinical signs of cranial gluteal nerve laceration
atrophy of gluteus medius
caudal gluteal nerve innervates:
extensors of the hip (gluteus medius, biceps femoris, semitendinosus), and the abductors of the hip
sciatic nerve innervates:
most of the hindlimb muscles either directly or via its tibial and common peroneal divisions. these muscles include the flexors of the stifle (biceps femoris (caudal division), semitendinosus, popliteus, gastrocnemius), extensors and flexors of the tarsus, and extensors and flexors of the digit
is the sciatic nerve a mixed nerve?
YES! it has cutaneous innervation (almost all the skin from the stifle down to the hoof) - the saphenous nerve (from the femoral nerve) innervates the medial strip of the leg
the tibial nerve is the cranial or caudal division of the sciatic nerve?
caudal - passes in between the gastrocnemius muscles
when does the tibial nerve give off the caudal cutaneous sural nerve?
right before it dives between the gastroc muscles
what does the tibial nerve innervate?
flexors of the stifle (poplitus, gastrocnemius), extensors of the tarsus (gastrocnemius, soleus, superficial and deep digital flexors), and flexors of the digit (superficial and deep digital flexors)
tibial nerve skin innervation:
caudolateral skin from stifle to hoof
tibial nerve joint innervation:
stifle joint, plantar aspects of fetlock, pastern and coffin joints, and the navicular bursa
clinical signs of a tibial nerve laceration:
hypermetric gait with “dropped hock” (yperflexsion of tarsus at rest), inability to flex digit, analgesia of plantar metatrsus and digit
is the common peroneal nerve the cranial or caudal division of the sciatic nerve?
cranial
what are the 3 branches of the common peroneal nerve?
lateral cutaneous sural n. , superficial and deep peroneal n.
common peroneal innervation:
flexors of the tarsus (long and lateral digital extensors, tibialis cranialis) and the extensors of the digit (long and lateral digital extensors)
lateral cutaneous sural nerve innervation:
skin of the dorsolateral suface of the crus and pes, tarsal joints, fetlock joint, and dorsal portions of pastern and coffin joints
clinical signs of common peroneal nerve laceration:
inability to flex the tarsus and extend the digit, the animal shows hyperextension of the hock and hyperflexion of the digit, fetlock knuckles during walking, and the toe is dragged. analgesia of the dorsolateral pes from the tarsus to the fetlock
tarsal joint innervation:
deep peroneal nerve
fetlock joint innervation:
medial and lateral dorsal metatarsal nerves, medial and lateral plantar nerves
pastern and coffin joint innervation:
plantar aspect by the medial and lateral plantar digital nerves (from tibial distribution) and the dorsal aspect by the medial and lateral dorsal digital nerves (distal branches of the dorsal metatarsal nerves - peroneal distribution)
