RPAs EXPLAINED [Part 2 FULL] | Vestibulospinal Reflex (VSR) & Hip Strategies

The video explores postural strategies, focusing on the hip strategy and its role in maintaining balance. It covers the anatomy of the vestibular system, including the semicircular canals and otolithic organs, and explains the vestibulospinal and vestibular colic reflexes. The hip strategy is detailed, highlighting its activation in narrow base support scenarios and its role in balance recovery through muscle activation.

What is the primary focus of the video before discussing the hip and stepping strategies?

• The elbow strategy

• The knee strategy

• The shoulder strategy

• The ankle strategy

Which part of the vestibular apparatus is responsible for sensing rotational acceleration?

• Saccule

• Semicircular canals

• Utricle

• Cochlear nerve

What is the role of the medial vestibular tract?

• Control muscles in the back

• Control muscles in the legs

• Control muscles in the neck

• Control muscles in the arms

Which reflex is responsible for maintaining head balance during postural sway?

• Ankle strategy

• Vestibulospinal reflex

• Hip strategy

• Vestibular colic reflex

What triggers the activation of the vestibulospinal reflex?

• Small perturbations

• No perturbations

• Large perturbations

• Constant perturbations

In a hip strategy, what is the sequence of muscle activation?

• Distal to proximal

• Proximal to distal

• Simultaneous activation

• Random activation

Which muscles are primarily activated during a posterior-directed perturbation in a hip strategy?

• Paraspinals and hamstrings

• Quadriceps and abdominals

• Biceps and triceps

• Calves and glutes

What happens to the contralateral knee during a lateral shift in center of gravity?

• It rotates

• It remains straight

• It flexes

• It extends

Which muscles are involved in returning the left hip to neutral during a right-directed perturbation?

• Hip extensors

• Hip flexors

• Hip adductors

• Hip abductors

What is the purpose of the contralateral knee bending during a lateral shift?

• To increase weight bearing on one foot

• To maintain balance by redistributing weight

• To initiate a stepping strategy

• To decrease weight bearing on one foot