ANAT30007 Lecture 27: [H1/91 notes] Nerves of Lower Limb A
10 Jun 2018
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Limb buds from side of developing body cavity at the level of L1-4, taking nerve supply from
ventral rami
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Ventral rami L1-4
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Within Psoas major (don't need to know or draw)
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Identify terminal branches as they emerge from borders of Psoas major
Branches emerge from lateral border of psoas onto quadratus lumborum (part of
posterior abdominal wall)
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Go into neurovascular plane of abdominal wall - supply abdominal wall, not lower limb
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llioinguinal and iliohypogastric nerves (L1)
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Lateral cutaneous nerve of thigh (L2,3): swings wide on iliacus, tucks under lateral edge of
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4 From lateral border
9.3 Nerves of Lower Limb
Wednesday, 6 May 2015
1:48 pm
Locomotor Page 1
Lateral cutaneous nerve of thigh (L2,3): swings wide on iliacus, tucks under lateral edge of
inguinal ligament where it attaches to ASIS - runs in lateral thigh cutaneous tissues
(compressed against ASIS in pregnant/obese people)
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Major terminal branch, supplies anterior thigh
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Runs in gutter between psoas and iliacus
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Femoral nerve (L2,3,4)
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Genital branch supplies spermatic cord, enters inguinal canal
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Femoral branch goes under inguinal ligament, supplies skin over femoral triangle
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1 Onto anterior surface: Genitofemoral nerve (L1,2): like two nerves in one sheath, splits into
genital and femoral branches
1 From medial border: Obturator nerve (L2,3,4): supplies medial compartment of thigh
Sacral plexus
Locomotor Page 2
Document Summary
Limb buds from side of developing body cavity at the level of l1-4, taking nerve supply from ventral rami. Within psoas major (don"t need to know or draw) Identify terminal branches as they emerge from borders of psoas major. 4 from lateral border llioinguinal and iliohypogastric nerves (l1) Branches emerge from lateral border of psoas onto quadratus lumborum (part of posterior abdominal wall) Go into neurovascular plane of abdominal wall - supply abdominal wall, not lower limb. Lateral cutaneous nerve of thigh (l2,3): swings wide on iliacus, tucks under lateral edge of. Lateral cutaneous nerve of thigh (l2,3): swings wide on iliacus, tucks under lateral edge of inguinal ligament where it attaches to asis - runs in lateral thigh cutaneous tissues (compressed against asis in pregnant/obese people) 1 onto anterior surface: genitofemoral nerve (l1,2): like two nerves in one sheath, splits into genital and femoral branches. Genital branch supplies spermatic cord, enters inguinal canal.
