SC Lumbosacral plexus Flashcards
what travels through the transvers foramen?
vertebra artery
what are the major abdominal muscles?
recuts abdominis; external oblique; internal oblique; transversus abdominis
as you ascend the spinal cord the amount of white mater?
increases
what is a major the difference between pyramidal and extrapyramidal tracts
pyramidal tracts (corticospinal and corticobulbar tracts) deal with voluntary movements; extrapyramidal tracts (rubrospinal tract; pontine reticulospinal tract; medullary reticulospinal tract; lateral vestibulospinal tract; tectospinal tract) deal with involuntary reflexes; movement and the modulation of movement;
fibbers from which tract (pyramidal or extrapyramidal) innervate motor neurons? Which tract modulates movements?
Pyramidal tracts; extrapyramidal tracts
what is the cauda equina?
the spinal cord and the vertebral column are at different heights this results in a “bundle”-like structure of nerve fibbers that extends caudally from the end of the spinal cord; gradually declining in number further down as individual pairs leave the spinal column.
where does the spinal cord end?
the spinal cord in adults ends at about the level of the first or second lumbar vertebra (L1 or L2); and at birth at L3.
what does the anterior root of the spinal nerve contain?
motor neuron axons
what does the posterior root ganglion of the spinal nerve contain?
sensory nerves cell bodies
the anterior ramus contains?
the mixed spinal nerve that supplies the antero-lateral parts of the trunk and the limbs
the posterior ramus contains?
the mixed spinal nerve that supplies the posterior parts of the trunks
in terms of the spinal cord; sympathetic fibbers exit the spinal cord at what levels? Parasympathetic fibbers exit at what levels?
sympathetic (T1-L3); parasympathetic (S2-S4)
Spinal nerves may contain the what categories of fibres?
General somatic efferent; General somatic afferent; general visceral efferent; general visceral afferent
which rami form the plexuses?
Anterior plexus
what nerves arise from the lumbar plexus? What level is the lumbar plexus?
Ilioinguinal nerve; Iliohypogastric nerve; Genitofemoral nerve; Obturator nerve; femoral nerve; lateral femoral cutaneous nerve; L1-L4
what does the lumbar plexus innervate?
Muscles of the lower abdomen; knee extensor muscles; hip adductor muscles
what does the femoral nerve supply? Where does it arise from?
iliacus; pectineus; Sartorius; quadriceps femoris; Arises from the posterior divisions of the lumbar plexus
what does the Obturator nerve supply?
hip joint; adductor longus; gracilis; adductor brevis; (pectineus); Obturator externus; adductor magnus; knee joint
what connects the lumbar plexus with the sacral plexus?
lumbosacral trunk; mainly a component of the sacral plexus
What is unique about the sciatic nerve?
it is the largest nerve in the body;
what does the sacral plexus innervate?
muscles of the pelvic girdle and pelvic floor; posterior thigh muscles; all muscles in the leg and foot
what muscles does the superior gluteal nerve innervate? What do muscles does the inferior gluteal nerve innervate?
The superior gluteal nerve supplies the gluteus medius and minimus and tensor fascia latae; the inferior gluteal nerve supplies the gluteus Maximus
the tibial nerve supplies what muscles?
knee joint; hamstring muscles; plantar flexors; ankle joint; plantar intrinsic foot muscles
the common fibular nerve supplies?
short head of biceps femoris; knee joint; fibularis muscles; dorsiflexion muscles; ankle joint; dorsal intrinsic foot muscles
