Exam 3- Lumbar Plexus Flashcards
The lumbar plexus is formed by the anterior primary rami of
L1-L3 and part of L4
And sometimes contribution from T12
What do the muscular branches of the anterior rami supply what muscles
Quadratus lumborum, psoas major, psoas minor
L1 muscular branch will supply
The quadratus lumborum and psoas minor
L2 muscular branch supplies
Quadratus lumborum and both psoas muscles
L3 and L4 muscular branches supply
Quadratus lumborum and psoas major
What fibers supplies iliohypogastric nerve
T12 and L1
What is the path of the iliohypogastric nerve
Anterior and inferior between quadratus lumborum and the kidney. Then travels through the transverse abdominal muscle and travels between it and the internal abdominal oblique
THe iliohypogastric nerve gives off a branch named
Lateral cutaneous branch
What does the lateral cutaneous branch supply
The posterolateral gluteal region
THe lateral cutaneous branch continues as the
Anterior cutaneous branch which supplies skin over pubic region
What two muscles are supplied by iliohypogastric nerve
Internal abdominal oblique
Transverse abdominal
What fibers make up ilioinguinal nerve
T12 and L1
What is the path of the ilioinguinal nerve
Transmitted through the inguinal canal. Leaves canal through superficial inguinal ring and travels with the spermatic cord
What sensory info does the ilioinguinal nerve supply
Skin of the upper medial thigh, also supplies the base of the penis and anterior scrotum in men. Female supplies mons pubis and labium majus
What two muscles does ilioinguinal nerve supply
Internal abdominal oblique
Transverse abdominal
What fibers make up genitofemoral
L1 and L2
What is the course of the genitofemoral nerve
Passes anteriorward through the psoas major muscle and then divides
What does the genitofemoral nerve divide into after passing through psoas major
Genial branch
Femoral branch
The genital branch travels through inguinal canal and provides motor supply to what muscle
Cremaster
What sensory info does the cremaster supply
Skin of superior anterior scrotum in males and skin for females of mons pubis and labium majus
What sensory info does the femoral branch supply
Passes POSTERIOR to the inguinal ligament and supplies skin of the upper anterior thigh
What fibers make up the lateral cutaneous nerve of the thigh
L2 and L3
True or False
THe lateral cutaneous nerve of the thigh is purely sensory
TRUE- supplies skin of the lateral thigh, superior to the knee
What is the path of the lateral cutaneous nerve of the thigh
Passes UNDER the inguinal ligament and travels ANTERIOR to sartorius and THROUGH fascia lata to reach the skin
What is the largest branch of the lumbar plexus
Femoral nerve
What is the path of the femoral nerve
forms POSTERIOR to the psoas major and emerges LATERAL to psoas and anterior illacus. Passes POSTERIOR to the inguinal ligament and enters femoral triangle just lateral to femoral artery. Runs INFERIOR and MEDIALLY through the adductor canal and into the leg, MEDIALLY to the knee
Where are the two areas that the femoral nerve only gives off branches
Abdomen
Femoral triangle
Within the abdomen the femoral nerve gives off muscular branches to
Iliacus and pectineus. Also some fibers to femoral artery
When does the femoral nerve divide into an anterior and posterior division
After it is beyond the inguinal ligament
The anterior division of femoral nerve gives off 3 nerves
Intermediate cutaneous nerve of the thigh
Medial cutaneous nerve of the thigh
Nerve to the sartorius
The intermediate cutaneous nerve of the thigh supplies
The skin on the anterior thigh down to the knee. The lateral branch communicates with the femoral branch of genitofemoral nerve
The medial cutaneous nerve of the thigh path is
Crosses ANTERIOR to the femoral artery and sends branches to the skin of the medial thigh, medial knee, knee across to the lateral side of the patella. Some supply skin of medial leg
How does the medial cutaneous nerve of the thigh supplies the skin of the medial leg through communicantions with
The saphenous nerve
The posterior division of the femoral nerve gives muscular branches that supply __________ and vascular branches _________.
Quadriceps, femoral artery
The muscular branches of the posterior division of femoral nerve suppluy
Sartorius, rectus femoris
Vastus lateralis, medialis, intermedialis
