Muscles Of The Thoracic Wall

Question 0

Origin, insertion, Innervation, and action of the transverse Thoracis.

Answer 0

Posterior surface of the lower sternum to the internal surface of costal cartilages 2-6.
Intercostal nerve.
Weak depressor of the ribs

Question 1

Origin, insertion, Innervation, and action of the external intercostal, internal intercostal, innermost intercostal.

Answer 1

Inferior borders to the superior borders of the ribs below.
Innervation: intercostal nerve
Action: external: elevates the ribs in forced respiration
Internal inter costal and innermost intercostal: during forced respiration interosseous part depresses ribs; interchondral part elevates the ribs.

Question 2

Origin, insertion, Innervation, and action of the sub costal.

Answer 2

Internal surfaces of lower ribs near there angles to the superior borders of the 2nd or 3rd ribs below.
Intercostal nerve
Interosseous part depresses ribs; interchondral part elevates the ribs.

Question 3

Origin, insertion, Innervation, and action of the levatores costarum.

Answer 3

Transverse processes of T7-T11 to subjacent ribs between tubercle and angle.
Posterior rami of C8-T11 nerves
Elevates the ribs

Question 4

Origin, insertion, Innervation, and action of the serratus posterior superior.

Answer 4

Nuchal ligament C7-T3 vertebrae to the superior borders of the 2nd-4th ribs.
2nd-5th intercostal nerves
Actions: elevates the ribs

Question 5

Origin, insertion, Innervation, and action of the serratus posterior inferior.

Answer 5

Inferior borders of 8th-12th ribs near the angles to the spinous processes T11-L2 vertebrae.
9th-11th intercostal nerves, and sub costal nerve T12
Depresses the ribs

Question 6

Psoas major origin insertion and Innervation?

Answer 6

Transverse processes of lumbar vertebrae, and sides of the vertebral bodies and IV discs of T12-S1to the strong tendon to the lesser trochanter of the femur.
Innervations: anterior rami of L2-L4
Action: flexes hip and trunk, and laterally flexes the vertebral column.

Question 7

Iliacus origin and insertion, and Innervation?

Answer 7

Superior two-thirds of the iliac, ala of the sacrum and anterior sacro-iliac ligaments to the lesser trochanter of the femur and shaft inferior to it and psoas major tendon.
Innervation: femoral nerve L2-L4
Acts: flexes the hip

Question 8

Quadratus Lumborum origin insertion, action, and Innervation.

Answer 8

Medial half of the inferior border of the 12th rib and tips of lumbar transverse processes to the illiolumbar ligament and internal lip of the iliac crest
Innervation: anterior rami of T12-L4.
Actions: extends and laterally flexes the vertebral column.

Question 9

Origin insertion and Innervation and action of levator ani muscles.

Answer 9

Body of the pubis, tendinous arch of the levator ani, ischial spine to the perineal body, coccyx, anococcygeal ligament, walls of the prostate or vagina, rectum, and anal canal.
Innervation: nerve to the levator ani (branches of S4) inferior anal nerve, coccygeal plexus
Helps support pelvic cavity

Question 10

Origin insertion and Innervation and action of coccygeus?

Answer 10

Ischial spine to the inferior end of the sacrum and coccyx
Innervated by branches of S4-S5 nerves
Action: forms a small part of the pelvic diaphragm and flexes coccyx

Question 11

Origin insertion and Innervation and action of internal obturator.

Answer 11

Pelvic surface of the ilium and ischium as wellas obturator membrane to the greater trochanter of the femur
Innervated: nerve to the obturator internus L5-S2
Action: laterally rotates the hip joint and hold held of femur in.

Question 12

Origin insertion and Innervation and action of piriformis.

Answer 12

Pelvic surface of 2nd-4th sacral segments; superior margin of the greater sciatic notch and sacro tuberous ligament.
Greater trochanter of the femur
Innervation: anterior rami of S1-S2
Action: laterally rotates the hip joint, abducts the hip joint; assists in holding the head of the femur.