vertical portion important component of posterior upper abdominal wall
attached to 12th rib above, iliac crest below, medially attached to T12-L5 bodies and transverse processes, laterally free floating; square (4-sided); pulls on transverse process of lumbar vertebrae and pulls rib 12 down; bilaterally is a weak extensor of trunk; unilaterally, lateral flexion of trunk; most active in walking by stabilizing trunk to keep balance
vertebral bodies and transverse processes in front of quadratus lumborum (T12-L5); passes through abdomen through hip and thigh and attaches to femur; hip flexor (primarily) and spine flexor
mainly tendinous; originates from T12-L5 and inserts on pubic bone; small and variably absent; more important in proprioception
origin is on iliac fossa; fan shaped muscle that narrows to tendon that passes into hip; fuses with psoas major near femur and helps to flex hip
iliacus and psoas (hip flexion)
ventral rami of T12-L4 innervates what muscle?
ventral rami of L1-3 innervates what muscle?
Psoas major and minor
femoral n. innervates what muscle?
carries motor and sensory to anterior abdominal wall
branch of L1 ventral ramus (runs posteriorly to psoas major); motor supply to abdominal wall; superior branch of L1 ventral ramus
branch of L1 ventral ramus (runs posteriorly to psoas major); motor supply to abdominal wall; sensory to groin/genitalia region inferior branch of L1 ventral ramus
starts posterior to psoas muscle and pierces through it to run course without innervating it; mixed nerve in males (cremastor muscle); sensory only in females
sensory only in both sexes; across iliacus inferior to inguinal ligament and anterior to anterior superior iliac spine; innervates later thigh; can be stressed to the point where sensory is lost to the lateral thigh in pregnancy and obesity
Lateral femoral cutaneous: (L2-3)
largest branch of lumbar plexus; passes in between psoas and iliacus and runs inferiorly to inguinal ligament; supply motor to lower limb muscles of anterior compartment of thigh and supplies skin sensory to skin overlaying those muscles; provides innervation that flexes hip muscles and extends knee
goes through obturator foramen; supplies motor innervation medial thigh muscles to adduct hip; sensory to skin covering medial thigh muscles
doesn’t go directly to any muscles or skin; travels into pelvis and contributes to sciatic nerve that supplies posterior muscles of thigh and all muscles below knee
provides sympathetic postganglionic bodies that innervates lower body
Lateral femoral cutaneou
What vertebrae make up the posterior barrier of the abdominal cavity?
T/F: There is no physical barrier between the abdominal and pelvic cavities.
_____ is a set of nerves (bliateral) made of the ventral rami of the T12-L5 spinal nerves