erector spinae group (O,I,A)

Question 1

iliocostalis

Answer 1

lumborum, thoracis, cervicis

• iliac crest (lumborum), inf 4 ribs/angles (thoracis), ribs 3-6 (cervicis)
• rib angles (lower 6-12 ribs), rib angles (upper 6 ribs), transverse processes (4-6 cervical vertebrae)
• extends and laterally bends the vertebral column

Question 2

longissimus

Answer 2

capitis, cervicis, thoracis

• lumbar, thoracic and cervical transverse processes
• transverse processes (of thoracic or cervical vertebrae), mastoid process of temporal b.
• extends vertebral column, rotates head

Question 3

spinalis

Answer 3

capitis, cervicis, thoracis

• spinous processes of upper lumbar & lower thoracic vertebrae
• spinous processes of upper thoracic & cervical vertebrae
• extends vertebral column