Final OIIA's (Pelvic cavity, thoracic wall, etc.) Flashcards
(28 cards)
Origin: Obturator internus
Anterolateral wall of true pelvis
Insertion: Obturator internus
Medial surface of greater trochantor of the femur
Innervation: Obturator internus
Nerve to obturator internus
Action: Obturator internus
-External rotation of the extended hip joint
-Abduction of flexed hip
Origin: Piriformis
Anterior surface of sacrum between anterior sacral foramina
Insertion: Piriformis
Greater trochanter of femur
Innervation: Piriformis
Branches from L5, S1, and S2
Action: Piriformis
-External rotation of extended hip joint
-Abduction of flexed hip
Origin: External intercostal
Inferior margin of rib above
Insertion: External intercostal
Superior margin of rib below
Innervation: External intercostal
Intercostal nerves
Action: External intercostal
-Most active during inspiration
-Supports intercostal space
-Moves ribs superiorly
Origin: Internal intercostal
Lateral edge of costal groove of rib above
Insertion: Internal intercostal
Superior margin of rib below
Innervation: Internal intercostal
Intercostal nerves
Action: Internal intercostal
-Most active during expiration
-Supports intercostal space
-Moves ribs inferiorly
Origin: Innermost intercostal
Medial edge of costal groove of rib above
Insertion: Innermost intercostal
Internal aspect of superior margin of rib below
Innervation: Innermost intercostal
Intercostal nerves
Action: Innermost intercostal
Acts with internal intercostal muscles
Origin: Subcostal
Internal surface (near angle) of lower ribs
Insertion: Subcostal
Internal surface of second or third rib below
Innervation: Subcostal
Intercostal nerves
Action: Subcostal
Depress ribs during forced respiration
(has a similar function to serratus posterior sup. & inf.)
