Upgrade to remove ads
Only $35.99/year

Spine muscles and abdominals (thoracic, lumbar and SIJ muscles)

Terms in this set (18)

Erector spinae group (as a whole)
A - unilaterally : laterally flex vertebral column to the same side. Bilateraelly: extend the vertebral column
O - common tendon (thoracolumbar aponeurosis) that attaches to the posterior surface of sacrum, iliac crest,t spinous processes of the lumbar and last two thoracic vertebrae.
I - various attachments at the posterior ribs, spinous and transverse processes of thoracic and cervical vertebrae and mastoid process of temporal bone
N - spinal

Use your erectors - when maintaining an upright posture
returning to anatomical position after tying your shoes
Picking up a heavy suitcase (lateral flexion)

Consists of spinalis, longissimus and iliocostalis
Spinalis
O - spinous processes of the upper lumbar and lower thoracic vertebrae (thoracis)
Ligamentum nuchae, spinous process of c-7
I - spinous processes of upper thoracic, spinous processes of cervical, except C-1
Longissimus
O - common tendon , transverse processes of upper five thoracic vertebrae
I - lower nine ribs and transverse processes of thoracic vertebrae
transverse processes of cervical vertebrae , amstoid process of temporal bone
Iliocostalis
O - Common tendon (lumburom) , posterior surface of ribs 1-12
I - Transverse processes of lumbar vertebrae 1-3 and posterior surface of ribs 6-12
psoterior surface of ribs 1-6
trasnverse processes of lower cervicals
Multifidus
A - unilaterally : rotate the vertberal column to the opposite side
bilterally : extend the vertebral column
O - sacrum and transverse processes of lumbar through cervical vertebrae
I - Spinous processes of lumbar vertebrae through second cervical vertbrea
N - spinal

Span one two to four vertebrae
Quadratus lumborum
A - unilaterally tilt (elevate the pelvis)
Laterally flex the vertbral column to the same side
Assists to extend the vertebral column
Bilaterally: fix the last rib during forced inhalation and exhalation
O - Posterior iliac crest
I - last rib and transverse processes of first through fourth lumbar vertebrae
N - lumbar plexus T12, L1,2,3
Rectus abdominis
A - flex the vertebral column
Tilt pelvis posteriorly
O - pubic crest, pubic symphysis
I - cartilage of fifth, sixth and seventh ribs and xiphoid process
N - T5-12 , ventral rami
External oblique
A - unilaterally: laterally flex vertebral column to the same side , rotate vertebral column to the opposite side
Bilaterally: flex the vertebral column, compress abdominal contents
O - external surfaces of fifth to twelth ribs
I - anterior part of the iliac crest, abdominal aponeurosis to linea alba
N - T5 , 6, 7-11, 12
Internal oblique
A - unilaterally: laterally flex vertebral column to the same side, rotate vertebral column to the same side.
Bilaterally: flex the vertebral column, compress abdominal contents
O - lateral inguinal ligament, iliac crest and thoracolumbar fascia
I - internal surface of lower three ribs, abdominal aponeurosis to linea alba
N - T7-L1, iliophypogastric and iloinguinal, ventral rami
Transverse abdominis
A - compress abdominal contents
O - lateral inguinal ligament , iliac crest, thoracolumbar fascia and internal surface of lower six ribs
I - abdominal aponeurosis to linea alba
N - T7-L1, iliophypogastric and iloinguinal, ventral rami
Diaphragm
A - draw down the central tendon of the diaphragm, increase the volume of the thoracic cavity during inhalation
O - costal attachment: inner surface of lower six ribs
lumbar attachment: upper two or three lumbar vertebrae
Sternal attachment: Inner part of xiphoid process
I - central tendon
N - phrenic C3,4,5
Quadriceps
A - all: extend the knee
rectus femoris : flex the hip
O - Rectus femoris: anterior inferior iliac spine (AIIS)
vastus medialis: Medial lip of linea aspera
vastus lateralis: Lateral lip of linea aspera, gluteal tuberosity and greater trochanter
vastus intermedius: anterior and lateral shaft of the femur
I - tibial tuberosity (via the patella and patella ligamnet)
N - femoral L2,3,4
Biceps femoris
A - flex the knee, laterally rotate the flexed knee, long head: extend the hip, assist to laterally rotate the hip , tilt the pelvis posteriorly
O - Long head: ischial tuberosity , Short head: lateral lip of linea aspera
I - Head of the fibula
N - Long head - sciatic tibial branch L5,s1,2,3
short head - sciatic peroneal branch L5,S1,S2
Semitendinosis
A - Flex the knee, medially rotate the flexed knee, extend the hip, assit to medially rotate the hip, tilt the pelvis posteriorly
O - ischial tuberosity
I - proximal, medial shaft of the tibia at pes anserinus tendon
N - sciatic (tibial branch) L4,5,S1,2
Semimembranosus
A - A - Flex the knee, medially rotate the flexed knee, extend the hip, assit to medially rotate the hip, tilt the pelvis posteriorly
O - ischial tuberosity
I - posterior aspect of medial condyle of tibia
N - sciatic (tibial branch) L4,5,S1,2
Gluteus Maximus
A - All fibres - extend the hip , laterally rotate the hip, abduct the hip. Lower fibres - adduct the hip
O - Coccyx, edge of sacrum, posterior iliac crest, sacrotuberous and sacroiliac ligaments
I - iliotibial tract (upper fibres) and gluteal tuberosity (lower fibres)
N - inferior gluteal L5,S1,2
Gluteus Medius
A - All fibres: abduct the hip, anterior fibres: flex the hip and medially rotate the hip, posterior fibres: extend the hip, laterally rotate the hip
O - gluteal surface of ilium, between posterior and anterior gluteal lines, just below the iliac crest
I - lateral aspect of greater trochanter
N - Superior gluteal L4,5, S1
Gluteus minimus
A - Abduct the hip, medially rotate the hip, flex the hip
O - gluteal surface of the iulum between the anterior and inferior gluteal lines
I - anterior aspect of greater trochanter
N - Superior gluteal L4,5,S1
Other sets by this creator