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LS Plexus

Study Q's for Lumbosacral Plexus 2a

QuestionAnswer
The majority of the lumbar plexus (L1-L4) is formed within the belly of what muscle? psoas major
Where is the majority of the sacral plexus (L4-S4) located? superficial to piriformis muscle
All seven nerves in the lumbar plexus are formed in the posterior division except for the __________________ nerve. Obturator Nerve L2-L4 (anterior division)
What is the most proximal portion of the sacral plexus? Lumbosacral Trunk. Fused L4-L5
Where does the sciatic nerve (L4-S3 mixed) split to become the Common Peroneal (L4-S2 PD) and Tibial (L4-S3 AD) portions? Distal 1/3 in posterior aspect of the thigh. Splits as it enters popliteal fossa.
What structures pass through popliteal fossa? Describe Superficial to Deep Tibal Nerve, Common Peroneal Nerve, Popliteal Vein, Popliteal Artery. Bonus: Which ones are vulnerable to injury and how?
How many nerves make up the sacral plexus? Eight. (nine if you count the sciatic portions as two)
Describe the positioning of the subcostal nerve? (T12 PD) Most superior nerve in the lumbar plexus. Inferior to 12th rib, deep to peritoneum, superficial to QL
Spinal nerves ____________________ and _______________can be joined together and split at the lateral border of the QL Iliohypogastric (T12-L1 PD) and Ilioinguinal (L1 PD)
The subcostal, ilihypogastric, and ilioinguinal nerves have primarily ¬¬¬¬¬_________________ innervation and supply the _______________________________ Cutaneous, Lower aspect of anterolateral abdominal wall. Small portion in anterior aspect of thigh in region of inguinal ligament (Ilioinguinal)
Describe the course of the IH and II nerves in the anterolateral abdominal wall IH:emerges lat. aspect of upper psoas m. and runs across QL. Dives into trans. abdominus muscle II: emerges lat. psoas major, across QL and upper iliacus, along iliac crest in oblique coruse, then dives into transverse abdominus Courses in inguinal canal*
Which cutaneous nerve supplies the anterior lateral aspect of the thigh? Lateral Femoral Cutaneous Nerve (L2,L3 PD)
Which lumbar plexus nerve supplies the cremaster muscle and a small patch of skin on the proximal region of the thigh? Genitofemoral Nerve (L1, L2 PD)
What are the cutaneous innervations of the medial aspect of the thigh? Femoral Nerve: anterior and medial femoral cutaneous branches and Obturator Nerve: distal aspect medial thigh
What are the three junctional regions of the lower limb? Gluteal Region, Inguinal Region, and Femoral Triangle. Bonus question: what are the boundaries of the femoral triangle?
Where is a potential entrapment point for the Lateral Femoral Cutaneous Nerve (L3,L3 PD)? Where nerve pierces investing fascia (or IT band) of thigh to enter subcutaneous tissue
What structure does the femoral nerve pass in order to enter the thigh? The femoral nerve is located just lateral to the psoas major and passes DEEP to the inguinal ligament to enter the thigh
How does the posterior femoral cutaneous nerve enter the gluteal region? What does it innervate? Passes through Greater Sciatic foramen and inferior to piriformis muscle. Innervates skin of posterior thigh and popliteal region
The greater saphenous vein is _____________positioned and joins the _____________vein while the small saphenous vein is______________positioned and joins the____________ vein Medial and anteriorly:Femoral vein Lateral and Posteriorly: Popliteal Vein
What three positional changes do our hip undergo in development? Medial Rotation, Adduction, and Extension
Which two structures reflect the rotation that occurs at our hips during development? Sartorius Muscle and Ischiofemoral Ligament
Discuss the location of the Superior Gluteal Artery and Inferior Gluteal Artery relative to nerves of Sacral Plexus SG=runs between Lumbosacral Trunk and S1. IG=runs between S2 and S3
Created by: Phillypino