Pelvic girdle + Lumbosacral Plexus

• The pelvis is the lower part of the trunk, consisting of two hip bones (coxal) joined by the sacrum.
• Hip Bone consists of: Ilium Ischium Pubis
• What is the joint where the sacrum meets the hip bone?

  Sacroiliac joint
• What is the sturcture that articulates with the head of the femur?

  Acetabulum
• The section where the 2 pubic bones meet is called the symphysis pubis
• Iliac crest is on the vertebral level: L4
• Ligament that extend from sacrum to ischial spine?

  Sacrospinous ligament
• Ligament extending from sacrum to ischial tuberosity?

  Sacrotuberous ligament
• You can view the sacrotuberous ligament more posteriorly
• 3 muscles of posterior abdominal wall learned?1. Iliacus 2. Psoas Major 3. Quadratus lumborum 

• Iliopsoas consists of: Psoas major and Iliacus
• Proximal attachements of Psoas major?

  Lumbar vertebrae bodies, intervertebral discs, and TPs
• Where does iliacus originate?

  Iliac fossa
• Where does the iliacus and psoas major insert?

  Lesser trochanter of femur
• What are the actions of the iliopsoas?

  Flexes thigh at hip, flexes vertebral column, stabilizes hip joint
• What is the innervation of psoas major?

  L2-L4 anterior rami
• what is the innervation of iliacus muscle?

  Femoral nerve
• Where does quadratus lumborum originate?

  12th rib, and TPs of lumbar vertebrae
• Where does quadratus lumborum insert?

  Iliac crest
• What is the action of quadratus lumborum?

  Extends vetebral column, laterally flexes vertebral column, fixes 12th rib during inspiration
• Innervation of quadratus lumborum?

  Anterior rami T12-L4
• the lumbosacral plexus consists of anterior rami of spinal nerves: L1-L5; S1-S4
• Lumbar plexus consisting of: Ant rami of spinal nerves L1-L4, innervates muscles of anterior and medial thigh
• Sacral plexus consists of spinal nerves L4-L5 and S1-S4, innervates muscles of gluteal region
• Sciatic nerve is part of the sacral plexus
• The sciatic nerve innervates the posterior thigh, leg, and foot
• lumbosacral trunk (L4-L5) descends into pelvis and participates in the formation of the sacral plexus
• L1 in lumbar plexus nerve?

  Iliohypogastric nerve and Ilioinguinal nerve
• L1-L2 nerve in lumbar plexus?

  Genitofemoral nerve
• L2-L3 nerve in lumbar plexus?

  Lateral cutaneous nerve of thigh
• L2-L4 nerve in lumbar plexus?

  Femoral nerve and obturator nerve
• Iliohypogastric nerve innervates?

  Abdominal muscles and the skin overlying the iliac crest and hypogastric region
• Ilioinguinal nerve innervates?

  Abdominal muscles and skin of genital region and medial thigh
• Genitofemoral nerve branches?

  Femoral and genital branch
• what does the femoral branch innervate?

  skin on anterior surface of thigh
• Genital branch innervates what?

  Cremaster muscle skin of genitals
• Lateral cutaneous nerve of thigh innervates what?

  Skin on anterolateral surface of thigh
• Femoral nerve supplies what?

  Iliacus and region of anterior thigh
• Obturator nerve supplies what?

  Region of medial thigh