PAS Anatomy & Physiology of Posture 3

Question 1

The quadratus lumborum muscle originates on the iliac crest and inserts primarily on which structure?

Accepted Answer

12th rib and lumbar transverse processes

Answer

The quadratus lumborum attaches to the 12th rib and the transverse processes of L1–L4, enabling lateral flexion, hip hiking, and spinal stabilization.

Question 2

Which type of muscle fiber is primarily responsible for maintaining static postural tone?

Accepted Answer

Type I (slow-twitch oxidative)

Answer

Type I slow-twitch fibers are highly fatigue-resistant and oxidative, making them ideal for sustained postural stabilization.

Question 3

Overpronation of the foot most commonly leads to which compensatory postural change at the knee?

Accepted Answer

Knee valgus (inward collapse)

Answer

Excessive pronation causes medial tibial rotation which drives the knee into a valgus position, disrupting alignment from the foot to the hip.

Question 4

The thoracolumbar fascia is important for postural stability because it:

Accepted Answer

Transfers force between the lower extremities, spine, and upper extremities

Answer

The thoracolumbar fascia acts as a key force-transfer structure connecting the gluteus maximus, latissimus dorsi, and spinal extensors, integrating trunk and limb movement.

Question 5

Which postural pattern is characterized by a forward-shifted thorax over a posteriorly tilted pelvis?

Accepted Answer

Sway-back posture

Answer

Sway-back posture involves anterior displacement of the thorax and hips forward, with the pelvis posteriorly tilted and knees hyperextended.

(PAS) Postural Alignment Specialist Practice Test

(PAS) Postural Alignment Specialist Practice Test

PAS Anatomy & Physiology of Posture 3