Intrinsic Intermediate Back Muscles

Question 1

Longissimus (thoracis, cervicis, capitis)

Answer 1

Origin: thoracis: lumbar TP; cervicis: upper thoracis TP; capitis: upper thoracic and lower cervical TP
Insertion: thoracic: thoracic TP and lower 9 ribs; cervicis: cervical TP; capitis: mastoid process
Action: ext, ipsilat lat flex, ipsilat rotation
Innervation: dorsal rami

Question 2

Spinalis (thoracis, cervicis)

Answer 2

Origin: thoracis: upper lumbar and lower thoracic SP; cervicis: lower ligamentum nuchae
Insertion: thoracis: upper thoracic spinal column; cervicis: axis SP
Action: ext, ipsilat lat flex, ipsilat rotation
Innervation: dorsal rami

Question 3

Iliocostalis (lumborum, thoracis, cervicis)

Answer 3

Origin: lumborum: iliac crest; thoracis: angles of lower ribs; cervicis: angles of upper ribs
Insertion: lumborum: angles of lower ribs; thoracic: angles of upper ribs; cervicis: lower cervical TP
Action: ext, ipsilat lat flex, ipsilat rotation
Innervation: dorsal rami