Intrinsic Muscles

Question 1

Intrinsic muscles of the back

Answer 1

These are three parallel groups or
columns called sacrospinalis or erector spinal muscle

They are named depending on location

N- They are all supplied by the dorsal rami of
the spinal nerves.

Question 2

Lateral column

Answer 2

ILIOCOSTALIS MUSCLE
• Lumborum
• Thoracis
• Cervicis

Question 3

Intermediate column

Answer 3

LONGISSIMUS MUSCLE
• Thoracis
• Cervicis
• Capitis

Question 4

Medial column

Answer 4

SPINALIS MUSCLE
• Thoracis
• Cervicis
• Capitis

Question 5

Transverso-spinalis muscles

Answer 5

Deep to the sacrospinalis muscle

• Multifidus muscle (most robust in the lumbar region) at the lumbosacral curvature
• Interspinalis muscle
• Intertransversarii muscle (between the transverse processes)
• Rotators- Short (brevis), Long (longus)
• Semispinalis muscle (in the neck region)

Question 6

Deep muscles

Answer 6

Levator costorum muscles