Deep back + occipital

Question 1

?

Answer 1

blue left: iliocostalis

blue middle: longissimus

blue right: spinalis

Question 2

What features of intrinsic muscles contrast with those of extrinsic?

Answer 2

Intrinsic muscles support posture, responsible for movements of vertebral column. they’re also involved in proprioception and they are innervated by the dorsal rami of spinal nerves

extrinsic are responsible for movement of the upper limbs, and they’re innervated by the accessory nerve or branches of the brachial plexus

Question 3

Hypaxial muscles include

Answer 3

Trapezius

Latissimus dorsi

Rhomboids

Levatore Scapulae

Question 4

What muscles constitute the “2nd layer” of the back and those of the “3rd layer” ?

Answer 4

2nd layer include levator and rhomboids, 3rd layer are the extrinsic muscles Serratus posterior superior and Serratus posterior inferior

Question 5

Serratus Posterior Superior: innervation and blood supply

Answer 5

T2+T5 intercostal nerves (VENTRAL rami, motor)

Posterior Intercostal arteries

Question 6

Serratus Posterior Superior: actions

Answer 6

elevates ribs