KP221 Lecture Notes - Lecture 9: Ischium, Obturator Foramen, Sciatic Nerve
KP221 – L9
Clinical: groin pull
Soas: anterior medial muscle - comes off vertebrae bodies (T12 - L1 - T5)
Crosses hip joint and attaches to lesser trochanter
Every joint in the low back and pelvis you have to look at soas
Soas is a hip flexor
Gluteus maximus and soas work opposite to each other
Soas has to relax to give power and soas will go into a contraction while running which
means it will tighten and the muscle will pull
Anterior Thigh Muscles (not quadriceps)
Psoas
Origin: side of T12-L5 vertebrae and their discs, TVPs of T12-L5 vertebrae
Insertion: lesser trochanter
Iliacus
Origin: iliac crest, iliac fossa, sacrum ala, anterior sacroiliac ligament
Insertion: tendon of psas major, lesser trochanter and femur distal to lesser trochanter
Action of psoas and iliacus
They work together
Flex and stabilize hip joint
Postural - controls trunk and involves movement when standing
Pectineus
Origin: superior ramus of pubis
Insertion: pectineal line of femur
Action: adducts with medial rotation of hip
Sartorius
Origin: ASIS
Insertion: superior part of medial aspect of tibia
Action: tailor muscles, hip flexion, abduction and lateral rotation
Patterns:
All supplied by the femoral nerve except for psoas which is supplied by the anterior rami
of L1-L12 and L3
Pectineus sometimes has additional supply from the obturator nerve
Blood supply: all are supplied by the femoral artery
Adductor Group - Adductor Brevis
Origin: body and inferior ramus of pubis
Insertion: pectineal line *, proximal linea aspera
Adductor longus
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Document Summary
Soas: anterior medial muscle - comes off vertebrae bodies (t12 - l1 - t5) Crosses hip joint and attaches to lesser trochanter. Every joint in the low back and pelvis you have to look at soas. Gluteus maximus and soas work opposite to each other. Soas has to relax to give power and soas will go into a contraction while running which means it will tighten and the muscle will pull. Origin: side of t12-l5 vertebrae and their discs, tvps of t12-l5 vertebrae. Origin: iliac crest, iliac fossa, sacrum ala, anterior sacroiliac ligament. Insertion: tendon of psas major, lesser trochanter and femur distal to lesser trochanter. Postural - controls trunk and involves movement when standing. Insertion: superior part of medial aspect of tibia. Action: tailor muscles, hip flexion, abduction and lateral rotation. All supplied by the femoral nerve except for psoas which is supplied by the anterior rami of l1-l12 and l3.
