Lumbar, Sacral and Coccygeal Plexuses Flashcards Preview

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Flashcards in Lumbar, Sacral and Coccygeal Plexuses Deck (18):
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Subcostal nerves

Anterior rami of T12

Pass through transversus abdominis and internal oblique to supply the external oblique and skin of anterolateral abdominal wall

1

Ilioinguinal and iliohypogastric nerves

Both arise from the anterior ramus of L1

Pierce transversus abdominis muscles near the anterior superior iliac spines and pass through the external and internal obliques to supply the abdominal muscles and skin of the pubic and inguinal regions

2

Lateral cutaneous nerve of thigh

Anterior rami of L2 and L3

Enters the thigh posterior to inguinal ligament just medial to anterior superior iliac spine and supplies the skin on the anterolateral surface of the thigh

3

Femoral nerve

Anterior rami of L2-L4

Lateral border of psoas major and innervates iliacus before passing deep to inguinal ligament and going to anterior thigh.

Supplies flexors of hip and extensors of knee

4

Genitofemoral nerve

Anterior rami of L1 and L2

Divides laterally to the common and external iliac arteries into femoral and genital branches

5

Obturator nerve

Anterior rami of L2-L4

Medial border of psoas major through pelvis to medial thigh supplying the adductor muscles

6

Lumbosacral trunk

Anterior rami of L4 and L5

Passes over ala of sacrum to join the anterior rami of S1-S4 nerves forming the sacral plexus

7

Sciatic nerve

Anterior rami of L4, L5, S1-S3

Articular branches to hip joint, muscular branches to flexors of knee and all muscles in leg and foot

8

Superior gluteal nerve

Anterior rami of L4, L5 and S1

Gluteus medius, gluteus minimus and tensor fascia latae muscles

9

Inferior gluteal nerve

Anterior rami of L5, S1 and S2

Gluteus maximus

10

Nerve to piriformis

Anterior rami of S1 and S2

Piriformis muscle

11

Nerve to quadratus femoris and inferior gemellus

Anterior rami of L4, L5, and S1

Quadratus femoris and inferior gemellus muscles

12

Nerve to obturator internus and superior gemellus

Anterior rami of L5, S1 and S2

Obturator internus and superior gemellus muscles

13

Pudendal nerve

Anterior rami of S2-S4

Structures in perineum: sensory to genitalia, muscular branches to perineal muscles, sphincter urethrae and external anal sphincter

14

Nerves to levator ani and coccygeus

Anterior rami of S3 and S4

Levator ani and coccygeus muscles

15

Posterior femoral cutaneous nerve

Anterior rami of S2 and S3

Cutaneous branches to buttock and uppermost medial and posterior surfaces of thigh

16

Perforating cutaneous

Anterior rami of S2 and S3

Cutaneous branch to medial part of buttock

17

Pelvic splanchnic nerves

Anterior rami of S2-S4

Pelvic viscera via inferior hypogastric and pelvic plexus