Axial Musculature

Question 1

Muscles of the Back

Answer 1

Serratus Posterior Superior, Serratus Posterior Inferior, Epaxial - True Muscles (Erector spinae group-iliocostalis, longissimus, spinalis; splenius group),

Question 2

Serratus Posterior Superior

Answer 2

• Intermediate Layer
• Elevates the ribs and increases thoracic volume for inspiration

Question 3

Serratus Posterior Inferior

Answer 3

Depresses the ribs during expiration

Question 4

Erector Spinae Group and Spleinus Group

Answer 4

• Epaxial Muscle, close to vertebral column
• Extensors of the vertebral column when bilateral and lateral flexors when unilateral

Question 5

Erector Spinae Group

Answer 5

Lateral to Medial: Iliocostalis, longissimus, spinalis
- I like standing

Question 6

Scalene Muscle

Answer 6

• Flexes the neck
• In the lateral neck

Question 7

Longus Muscles (Colli & capitis)

Answer 7

Run along the anterior surface of the vertebrae
- Prevertebral and flex the neck

Question 8

Infrahyoid muscles

Answer 8

Depress and stabilize the hyoid bone

Question 9

External Intercostal Muscles

Answer 9

• Thorax (Ventilation of the lungs)
• Fascicles run in an inferior and medial direction (down and in)
• Elevate ribs = inspiration

Question 10

External Oblique Muscles

Answer 10

• Abdomen
• Fascicles run in an inferior and medial direction

Question 11

Internal Intercostal muscles

Answer 11

• Thorax (ventilation of the lungs)
• 90 degrees from the external muscles and fascicles run inferiorly and laterally (down and out)
• Depresses ribs = expiration

Question 12

Internal Oblique muscles

Answer 12

• Abdomen
• 90 degrees from the external muscles and fascicles run inferiorly and laterally

Question 13

Transversus Thoracis

Answer 13

• Thorax (ventilation of the lungs)
• Fan out in a variety of directions and the most inferior are nearly horizontal
• Depresses ribs = expiration

Question 14

Transversus Abdominis

Answer 14

Fascicles travel in a horizontal plane

Question 15

Diaphragm

Answer 15

Primary muscle for relaxed breathing
- Boundary between thoracic and abdominal cavities, contraction = inspiration

Question 16

Psoas Major

Answer 16

Runs along the anterior surface of the vertebra (prevertebral)
- travels and joins with the iliacus
Flex the lumbar vertebrae and flex the hip

Question 17

Quadratus Lumborum

Answer 17

Laterally flexes the lumbar vertebrae (spine)

Question 18

Rectus Abdominis

Answer 18

Flexes the vertebral column
- Tendons seprarete muscle into bellies - 6 pack

Question 19

Perineal Muscles

Answer 19

Make up the urogenital triangle b/w the rami of the pubic bones
-Sex and support floor of pelvis
- External anal sphincter: voluntary control of defacation

Question 20

Pelvic Diaphragm

Answer 20

Bowl that cradles the pelvic viscera and support the otgans
- Contract when sneezing to prevent escape of pee or feces

Question 21

Iliacus

Answer 21

Comes down form the pelvis and combine with psoas major and iliacus before the femur to turn into iliopsoas at femur