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17 Cards in this Set
- Front
- Back
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What is the range of the spinal nerves contributing to the lumbosacral plexus? |
L4 - S2 (Lumbar 4 to Sacral 2)
Additionally L7 in carnivores
Innervates hindlimb/pelvis Nerves run more caudally than FL |
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List the peripheral nerves of the lumbosacral plexus from cranial to caudal. |
1. Femoral nerve 2. Obturator nerve 3. Gluteal nerve (cranial and caudal) 4. Sciatic nerve
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What nerves make up the femoral nerve? What muscles does it innervate? |
Femoral nerve (L4 - L6)
Motor to: Quadriceps femoris (vastus lateralis, rectus femoris, vastus intermedialis, vastus medialis)
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What important nerve branches off the femoral nerve? What is its role? What muscles does it innervate?
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Saphenous nerve - Superficial branch of of femoral n. - Sensory to medial thigh, leg, hock and paws - Sartorius |
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What makes up the obturator nerve? What is its role? What muscles does it innervate?
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Obturator nerve (L4-L6) Motor to ADDUCTORS - Gracilis, pectineus, adductor and external obturator (obtuator internus in ruminants and pigs)
Damage: Easy to injure - foaling/calving can cause limb to slip sideways on slippery floors |
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What is the spinal range of the lumbosacral trunk? What nerves branch off of it? |
Lumbosacral trunk (L6/7 - S2)
Short cranial gluteal nerve Caudal gluteal nerve Caudal cutaneous femoral nerve
Continues as sciatic nerve |
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What muscles are innervated by the short cranial and caudal gluteal nerves?
What larger nerve do these nerves come from? |
Short cranial gluteal nerve FLEXORS AND EXTENSORS Middle and deep gluteals (sometimes superficial gluteal) Tensor fascia lata
Caudal gluteal nerve EXTENSORS OF HIP Superficial gluteal ** Vertebral heads of hamstrings (biceps femoris, semitendinosus, semimembranosus) in horses and cow
These nerves come from the lumbosacral trunk
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Where does the sciatic nerve run? What muscles does it innervate? What nerve is it a continuation of? |
Sciatic nerve - Largest peripheral nerve - Runs between gluteals to caudal thigh - Runs between biceps femoris and semitendinosus, branches
MOTOR to: Hamstrings (pelvic heads) Caudal hip muscles (Biceps femoris, gemelli, quadratus femoris)
Continuation of the lumbosacral trunk
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The sciatic nerve also has a sensory component. What sensory nerves does it split into? |
Lateral cutaneous sural nerve - skin of lateral leg Caudal cutaneous sural nerve - skin of caudal leg |
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From the lumbosacral trunk, the sciatic nerve splits mid-thigh to 4 branches. They are... |
1. Lateral cutaneous sural nn. 2. Caudal cutaneous sural nn. 3. Tibial n. 4. Common peroneal n. |
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Where does the tibial nerve run? What is muscles and surfaces does it innervate? What if it is damaged?
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Tibial nerve Larger, in popliteal fossa to caudal leg
MOTOR to hock extensors, digit flexors Gastrocnemius m. Soleus m. Popliteus m. SDF m. DDF m.
SENSORY to: Plantar foot (Plantar n.)
Damage: Overflexion of hock,overextension of digits |
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Where does the common peroneal (fibular) nerve run? What muscles and surfaces does it innervate? What if it is damaged? |
Common peroneal nerve - Runs laterally into cranial leg (over fibula) - Splits into superficial and deep branches
Deep branch MOTOR to: Cranial hock flexor, digital extensors SENSORY to: dorsal hock, paw and digits
Superficial branch SENSORY to: Dorsolateral leg, dorsal paw and digits
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What does the caudal cutaneous femoral nerve innervate? |
Caudal cutaneous femoral nerve SENSORY to proximal caudal thigh |
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What nerves are responsible for SENSORY the purple, green, yellow, orange, light blue, red regions? |
Purple - Caudal cutaneous femoral n. Green - Lateral cutaneous femoral n. Yellow - Sciatic n. Orange - Deep and superficial peroneal n. Light Blue - Saphenous n. Red - Tibial n. |
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What two things about the lumbosacral plexus differ in the horse? |
Sciatic n. splits EARLIER into tibial and peroneal nerves.
Superficial peroneal n. innervates LATERAL EXTENSOR (instead of deep peroneal n.) |
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How does innervation of the foot in equine differ from other species? |
Innervation of the foot is ALL SENSORY
Deep peroneal n. splits into DORSAL medial and lateral metatarsal n. (3, 3')
Tibial n. splits into medial and lateral PLANTAR n. (1, 2)
Continue as median and lateral digital n. (5, 5') |
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How does innervation of the foot in the bovine differ from other species? |
Dorsal and plantar common digital n. (9, 11) |
