Spine and Thorax

What is the name of muscle A in the image and what actions are associated with it?

• Serratus Posterior Superior; elevate the ribs during inhalation

• Serratus Posterior Inferior; depress the ribs during exhalation

• Internal intercostals; draw the ribs inferiorly (decrease space of thoracic cav) to assist with exhalation

Which group of muscles extend?

• Rectus abdominis, external/internal obliques, Psoas major, illiacus

• longissimus, iliocostalis, multifidi, rotatores, semispinalis capitis, spinalis, quad lumb, interspinalis, intertransversarii, lat. dor

• ext/int obliques, multifidi, rotatores

Which muscle is shown and what actions are associated with it?

• Internal oblique; laterally flex, rotate, flex vertebral column, compress abdominal contents

• External oblique; laterally flex, rotate, flex vertebral column, compress abdominal contents

• Rectus abdominis; flex vertebral column, tilt pelvis

What is the name of this muscle and what actions are associated with it?

• Serratus Posterior Superior; elevate the ribs during inhalation

• Interspinalis; extend vertebral column

• Intertransversarii; laterally flex, extend

What is B?

• Supraspinous ligament

• Interspinous ligament

• Intervertebral disk

Look at the picture. Which of these is the Spinalis?

• A

• B

• C

This image shows muscles from which group?

• Erector Spinae Group

• Transversospinalis Group

• SubOccipitals Group

What's the name, actions and insertion?

• Anterior scalene; laterally flex & rotate head and neck, elevate ribs during inhalation; 1st rib

• Middle scalene; laterally flex & rotate head and neck, elevate ribs during inhalation; 1st rib

• Posterior scalene; laterally flex & rotate head and neck, elevate ribs during inhalation; 2nd rib

During inhalation, the scalenes do what?

• Elevate the 1st (middle, anterior) and 2nd ribs (posterior)

• Depress the 1st (middle, anterior) and 2nd ribs (posterior)

• Elevate the 2nd and 3rd ribs

What is A and what does it do?

• Anterior longitudinal ligament limits the amount of extension of the spine.

• Ligamentum flavum, assists the vertebral column in returning to normal upright posture after flexion

• Posterior longitudinal ligament limits flexion