MUSCLES OF THE BACK Flashcards
(22 cards)
Serratus posterior inferior (O, I, A)
O: Inferior borders of 8th to 12th ribs near the angles
I: Spinous processes of T11-L2 vertebrae
A: Depresses ribs
Serratus posterior superior (O, I, A)
O: Nuchal ligament, spinous processes of C7-T3
I: Superior borders of 2nd-4th ribs
A: Elevates ribs
Both SPI, SPS
Both these muscles expand the thoracic cavity, forced respiration
Splenius capitis and cervicis (neck region) origin
Spinous processes of C7 to T6 and nuchal ligaments
S cap and s cerv innervation
Posterior rami of spinal nerves
S cap and s cerv action
Laterally flex neck and rotate head from side of activate muscles (alone), extending head and neck (together)
S cap insertion
Mastoid process, nuchal line of occiptal bone
S cerv insertion
Tubercules of transverse processes C1-3/4
Erector spinae consists of
- Works to:
- Groups go:
- Origin
- Iliocostalis, longissimus spinalis
- All work together to keep back upright, erect against of gravity
- Outward, middle, inward
- Upper sacral and lower lumbar vertebrae
Iliocostalis lumborum
O,I
O: iliac crest and sacrum
I: Slips into lower 6/7 ribs
Illiocostalis throacis (O,I)
O: Upper borders of lower 6/7 ribs (medial to iliocostalis lumborum insertion)
I: Lower borders of upper 6 ribs
Iliocostalis cervicis (O,I)
O: Angles of upper 6 ribs
I: Transverse processes of C4 to C6
L. thoracic
Origin: Common tendon of erector spinae
Insertion: Lower 9 or 10 ribs and the adjacent transverse processes
L cervicis
O, I
O: Trans. proc. of T1-T4/5
I: Trans. proc. of C2-C6
L cap (O, I)
o: medial to superior end of cervicis
i: lateral mastoid process
Spinalis thor. (O, I)
Common tendon of spinous processes of T11-L2
Spinalis cer. (O,I)
O: Ligamentum nuchae and C7-T1/2
I: Spinous processes of axis (C4/C4)
Semispinalis capitis/spinalis capitis (medial part)
O: Transverse processes of T1-T6/7 and articular processes of lower cervical vertebrae
I: Occiptal bone
A: Extend the head
Semispinalis cervicis
O: Transverse processes of T1-T5/6
I: Spin. proc. of C2-C5
A: Extend the spine
Semispinalis thoracis
O: Transverse processes of T7-T12
I: Spinous processes of C6-T4
A: Extend the spine
Multifidis muscle
O: Sacrum and transverse processes of lumbar to cervical vertebrae
I: Spinous processes of lumbar to C2
A: bilaterally extend spine
Unilaterally rotate spine towards the opposite side and lateral flexion
Rotators
O: Single transverse process
I: Single spinous process
A: Rotate and extend spine
