Intrinsic back muscles

Question 0

Name the three muscles that make up the Erector Spinae

Answer 0

lliocostalis, Longissimus, Spinalis

Question 1

Name the sub muscles of the splenius?

Answer 1

Capitis and Cervicis

Question 2

Splenis Origin, Insertion, Nerve supply and actions?

Answer 2

Origin: Arises from the nuchal ligament and spinous processes of C7 to T6 vertebrae

Insertion: Capitis: fibers run superolaterally to mastoid process of temporal bone and lateral third of superior nuchal line of Occipital bone. Cervicis: Tubercles of transverse processes of C1-C3 or C4 vertebrae

Nerve: posterior rami of spinal nerves

Actions: Acting alone: Laterally flew neck and rotate head to side of active muscles. Acting together: extend head and neck.

Question 3

Erector Spinae Origin, Insertion, nerve supply, and actions

Answer 3

Origin: Broad tendon from the posterior part of the iliac crest, posterior surface of sacrum, sacro-iliac ligaments, sacral and inferior lumbar spinous processes and supraspinous ligament

insertion: Iliocostalis fibers run superiorly to angles of lower ribs and cervical transverse processes. Longissimus: fibers run superiorly to ribs between tubercles and angles to transverse processes in thoracic and cervical regions and to mastoid process of temporal bone. Spinalis: Fibers run superiorly to spinous processes in upper thoracic region and to cranium.

Nerve: Posterior Rami

Actions: Bilaterally: Extend vertebral column and head as back is flexed, control movement by gradually lengthening their fibers. Unilaterally: Laterally flex vertebral column.

Question 4

3 muscles of the Iliocostalis?

Answer 4

Lumborum, thoracics and cervicis

Question 5

3 muscles of the Longissimus?

Answer 5

Thoracis, Cervicis, and Capitis

Question 6

3 muscles of the Spinalis

Answer 6

Thoracis, Cervicis, and Capitis

Question 7

name the muscles of the Transversesospinales from lateral to medial

Answer 7

Semispinalis, Multifidus, Rotatores (Brevies and longus)

Question 8

Semispinalis everything

Answer 8

thoracis, cervicis and capitis
origin: Arises from transverse processes of C4 to T10 vertebrae
Insertion: fibers run superomedially to occipital bone and spinous process in upper thoracic and cervical regions spanning four to six segments
Nerve supply: posterior rami
actions: Extends head and thoracic and cervical regions of vertebral column and rotates them contralaterally

Question 9

Multifidus

Answer 9

Origin: arises from posterior sacrum, posterior iliac spine of ilium, aponeurosis of erector spinae, sacro-iliac ligaments, mammillary processess of lumbar vertebrae, transverse processes of thoracic vertebrae and articular processes of C4 to C7

Question 10

Rotatores

Answer 10

origin: Arise from transverse processes of vertebrae; best developed in the thoracic region
Insertion: Fibers pass supperomedially to attach to junction of lamina and ttransverse process of vertebra immediately (brevis) or two segments (longus) superior to vertebra of origin
Nerve supply: Posterior rami
action: may function as organs of proprioception, possibly stabilize vertebrae and assist with local extension and rotatory movements of vertebral column

Question 11

Levatores Costarum

Answer 11

O: Tips of transverse processes of C7 and T1 to T11
I: Pass inferolaterally and insert on rib between its tubercle and angle
N: Posterior rami of C8 to T11
A: Elevate ribs, Assisting respiration assist with lateral flexion of vertebral column

Question 12

Suboccipital triangle name the boarders and the roof

Answer 12

Obliquus Capitis superior is superolateral
Obliquus Capitis inferior is inferolateral
Rectus Capitis posterior major is superomedial
The Semispinalis capitis is the roof
The Posterior atlanto-occipital membrane and posterior arch of C1 make up the floor

Question 13

Rectus Capitis posterior major

Answer 13

Arises from the spinous process of C2 vertebra and inserts into the lateral part of the inferior nuchal line of the occipital bone

Question 14

Rectus Capitis posterior minor

Answer 14

Arises from the posterior tubercle on the posterior arch of the C1 vertebra and inserts into the medial their of the inferior nuchal line

Question 15

Obliquus Capitis Inferior and Superior

Answer 15

Inferior: Arises from the spinous process of the C2 vertebra and inserts into the transverse process of the C1 vertebra. (no attachment to the cranium)

Superior: Arises from the transverse process of C1 and inserts into the occipital bone between the superior and the inferior nuchal lines.