Intrinsic Back Flashcards
Splenius capitis origin
Inferior ligamentum nuchae
C7-T3/4
Splenius Capitis insertion
Superior nuchae line
Mastoid process
Splenius Capitis action
Unilateral: rotate head/neck same side
Laterally flex neck
Bilateral: extend head and neck
Splenius Capitis nerve
Dorsal rami
Splenius cervicis origin
Spinous processes T3-T6
Splenius cervicis insertions
Transverse processes C1-C3
Splenius cervicis Action
Unilateral: rotate head/neck to same side
Laterally flex neck
Bilateral: extend neck
Splenius cervicis nerve
Dorsal rami
Erector spinae origin
Broad tendon, posterior iliac crest, posterior sacrum, sacroiliac ligaments, sacral and inferior lumbar spinous, supraspinous ligaments
Erector spinae action
Bilateral: posture, extend trunk/neck/head
Unilateral: laterally flex trunk, rotate trunk same side
Erector spinae nerve
Dorsal rami
Spinalis (medial column) insertion
Thoracis: spinous processes mid-upper thoracic spine
Capitis: blends with semispinalis capitis
Longissimus (intermediate) insertion
Thoracis: transverse process/ribs in thoracic
Cervicis: transverse processes in cervical region
Capitis: mastoid process
Iliocostalis (lateral) insertion
Lumborum: angle of ribs 7-12
Thoracis: angle of ribs 1-6, transverse process C7
Cervicis: transverse process C4-6
Transversospinalis attachments
From transverse processes to spinous processes in groove
Transversospinalis action
Unilateral: laterally flex ipsilateral, rotate contralaterallay
Bilateral: extend head/column, stabilize column
Transversospinalis nerve
Dorsal rami
Semispinalis (Capitis, cervicis, thoracis) origin
Thoracic and cervical transverse processes
Semispinalis (Capitis, cervicis, thoracis) insertion
Spinous processes multiple levels superior
Multifidus origin
Transverse processes from sacrum to C4
Multifidus insertion
Spinous processes 2-4 segments above up to C2
Rotatores origin
Transverse processes
Rotatores insertion
Base of spinous processes 1-2 segments superior
Interspinalis
Connects adjacent spinous processes to extend column
