Back: Origins, Insertions, Actions, Innervations Flashcards
Trapezius
A: lateral flexion of neck, rotation of head, scapula retraction, elevate scapula, depress scapula
N: spinal accessory nerve (CN XI)
Rhomboid major
A: retract and elevate the scapula inferior to scapular spine, rotate glenoid cavity inferiorly
N: dorsal scapular nerve
Rhomboid minor
A: retract and elevate scapula, rotate glenoid cavity inferiorly
N: dorsal scapular nerve
Levator scapulae
A: elevate scapula, rotate glenoid cavity inferiorly, extend and laterally flex the neck (when scapula is fixed)
N: Dorsal scapular nerve
Serratus posterior superior
A: elevate the ribs with forced inspiration
N: intercostal nerve
Serratus posterior inferior
A: depress ribs with forced expiration
N: anterior rami T9-T12
Splenius capitus
A: neck extension when working bilaterally, lateral neck flexion and face rotation when working unilaterally
N: posterior rami C3-C5
Splenius Cervicus
A: neck extension when working bilaterally, lateral flexion of neck and face rotation when working unilaterally
N: posterior rami C5-7
Iliocostalis lumborum
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Iliocostalis thoracis
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Iliocostalis cervicis
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Longissimus thoracis
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Longissimus cervicis
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Longissimus capitis
A: extension of neck working bilaterally, laterally flex neck and rotate face while working unilaterally
N: posterior rami
Spinalis thoracis
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Spinalis cervicis
A: maintain erect posture and extend vertebral column and head when working bilaterally, lateral flexion of vertebral column when working unilaterally
N: posterior rami
Semispinalis thoracis
O, I, A, N
O: transverse processes (T6-T12)
I: spinous processes (C6-T4)
A: spinal extension and rotation
N: posterior rami
Semispinalis cervicis
A: spinal extension and rotation
N; posterior rami
Semispinalis capitis
A: extent head, rotate face away
N: posterior rami
Multifidus
O, I, A, N
O: lumbar spine: mamillary processes thoracic spine: transverse processes cervical spine: articular processes I: 3 spinous processes superior A: spinal extension and rotation away N: posterior rami
Rotatores longus
O, I, A, N
O: transverse process
I: 2 spinous processes superior
A: spinal extension, spine rotation away
N: posterior rami
Rotatores brevis
O, I, A, N
O: transverse process
I: 1 spinous process superior
A: spinal extension and rotation away
N: posterior rami
Interspinalis
O, I, A, N
O: spinous process
I: adjacent spinous process
A: spinal extension
N: posterior rami
Intertransversarii
O, I, A, N
O: transverse process
I: adjacent transverse process
A: laterally flex spine
N: posterior portion (posterior rami) and anterior portion (anterior rami)
Levator costarum longus
O, I, A, N
O: transverse process
I: 2nd rib inferior to origin
A: elevate ribs
N: posterior rami
Levator costarum brevis
O, I, A, N
O: transverse processes C7-T11
I: adjacent rib inferior to origin
A: rib elevation
N: posterior rami
Rectus capitus posterior major
O, I, A, N
O: spinous process C2
I: lateral portion inferior nuchal line
A: head extension and face rotations outward
N: Suboccipital nerve
Rectus capitis posterior minor
O, I, A, N
O: posterior tubercle C1
I: below inferior nuchal line
A: head extension
N: Suboccipital nerve
Obliqqus capitis inferior
O, I, A, N
O: spinous process C2
I: transverse process C1
A: face rotation toward
N: Suboccipital nerve
Obliquus capitis superior
O, I, A, N
O: transverse process C1
I: between superior and inferior nuchal lines
A: extend and laterally flex head
N: suboccipital nerve
