Week 3 Flashcards
External Oblique Origin
5th-12th ribs
External oblique Insertion
Linea alba
pubic tubercle
anterior iliac crest
External Oblique Innervation
Intercostal nn (T7-T11) Subcostal n (T12)
External Oblique Action
Unilateral: Bends trunk to same side, rotates trunk to opposite side
Bilateral: Flexes trunk, compresses abdomen, stabilizes pelvis
Internal Oblique Origin
Thoracolumbar fascia
iliac crest
anterior superior iliac spine
iliopsoas fascia
Internal Oblique Insertion
10th-12th ribs
Linea alba
Internal Oblique Innervation
Intercostal nn
Subcostal n (T12)
Iliohypogastrc n
ilioinguinal n
Internal Oblique Action
Unilateral: Bends trunk to same side, rotates trunk to opposite side
Bilateral: Flexes trunk, compresses abdomen, stabilizes pelvis
Transversus Abdominis Origin
7th-12th costal cartilages thoracolumbar fascia iliac crest anterior iliac spine iliopsoas fascia
Transversus abdominis Insertion
Linea alba
Pubic Crest
Transversus abdominis Innervation
Intercostal nn
Subcostal n (T12)
Iliohypogastrc n
ilioinguinal n
Transversus Abdominis Action
Unilateral: Rotates trunk to same side
Bilateral: compresses abdomen
Rectus Abdominis Origin
Lateral Head: Crest of pubis to pubic tubercle
Medial Head: Anterior region of pubic symphysis
Rectus Abdominis Insertion
Cartilages of 5th-7th ribs
xiphoid process of sternum
Rectus Abdominis Innervation
Intercostal nn (T5-T11) Subcostal n (T12)
Rectus Abdominis Action
Flexes trunk
Compresses abdomen
stabilizes pelvis
Pyramidalis origin
Pubis
Pyramidalis insertion
Linea alba
runs within rectus sheath
Pyramidalis innervation
Subcostal n
Pyramidalis Action
Tenses Linea Alba
Psoas Minor Origin
T12
L1 Vertebrae
Intervertebral disk (lateral surface)
Psaos Minor Insertion
Pectineal Line
Iliopubic ramus
iliac fascia
(Lowermost fibers may reach inguinal lig)
Psoas Minor Innervation
L1
L2
L3 spinal nerves
Psaos Minor Action
Weak Flexor of Trunk
Psaos Major Origin
superficial layer
T12-L4 vertebral bodies and associated intervertebral disks
Psaos Major Insertion
superficial layer
Femur (lesser trochanter)
joint insertion as iliopsoas muscle
Psoas major innervation
superficial layer
L1, L2, L3
Psaos Major Action
superficial layer
Hip Joint: flexion and external rotation Lumbar spine (Femur fixed)
Unilateral: Contraction bends trunk laterally
Bilaterally: Contraction raises trunk from supine position
Psoas Major Origin
deep layer
L1-L5 (costal processes)
Psoas Major Insertion
deep layer
Femur (greater Trochanter)
Joint insertion as iliopsoas muscle
Psoas Major innervation
deep layer
L1, L2, L3
Psaos Major Action
deep layer
Hip Joint: flexion and external rotation Lumbar spine (Femur fixed)
Unilateral: Contraction bends trunk laterally
Bilaterally: Contraction raises trunk from supine position
Iliacus Origin
Iliac Fossa
Iliacus Insertion
Femur (Lesser Trochanter)
Joint insertion as iliopsoas muscle