Posterior Abdominal Wall

Question 1

is there a physical barrier between the abdominal and pelvic cavities?

Answer 1

no

Question 2

iliopsoas

Answer 2

iliac and psoas

Question 3

innervation of quadrates lumborum

Answer 3

ventral rami of T12-L4

Question 4

innervation of psoas major and minor

Answer 4

ventral rami of L1-3

Question 5

innervation of iliacus

Answer 5

femoral n

Question 6

what is the lumbar plexus?

Answer 6

a set of nerves (bilateral) made of the ventral rami of the T12 through L5 spinal nerves

Question 7

cervical and brachial plexuses are made of

Answer 7

ventral rami

Question 8

the nerves carry the types of axons that nearly all ventral rami carry, including (3)

Answer 8

somatic motor
somatic sensory
sympathetics to visceral body wall structures (ex. sweat, glands)

Question 9

most of the nerves of the lumbar plexus carry

Answer 9

axons from more than one spinal cord level

Question 10

The large muscles of the limbs need to be more complex than the simple strips of muscles derived from

Answer 10

single myotomes (think about the intercostal muscles)

Question 11

The limb muscles are derived from multiple myotomes, so they require innervation from

Answer 11

the corresponding, multiple spinal nerves

Question 12

It is more efficient to combine the axons supplying large muscles into

Answer 12

large nerves

Question 13

it is more efficient to combine the skin covering the limbs with nerves combining the

Answer 13

axons that supply dermatomes associated with multiple spinal cord levels

Question 14

The patterns of somatic sensory supply to the skin of the limbs differs when comparing

Answer 14

dermatomes to nerves