Muscle Chart 2 Flashcards
Semispinalis thoracis
O: Transverse process of T6 to T10
I: Spinous process of upper four thoracic and lower two cervical vertebrae.
Segmental branches of posterior rami of spinal nerves.
Both sides–Trunk extension
One side–Trunk rotation to the opposite side
Trunk lateral flexion to same side.
Semispinalis cervicis
O: Transverse processes of T1 to T5 or T6.
I: Spinous process of C2 (axis) to C5
Segmental branches of posterior rami of spinal nerves.
Both sides–Head extension
One side–Head rotation to the opposite side.
Head lateral flexion to same side.
Semispinalis capitis
O: Transverse processes of T1 to T6 (or T7) and C7 and articular processes of C4 to C6.
I: Medial area between the superior and inferior nuchal lines of occipital bone.
Segmental branches of posterior rami of spinal nerves.
Both sides–Head extension
One side–Head lateral flexion to same side.
Head rotation to the opposite side.
Multifidus
O: Sacrum, origin of erector spinae, posterior superior iliac spine, mammillary processes of lumbar vertebrae, transverse processes of thoracic vertebrae and articular processes of lower four cervical vertebrae.
I: Base of spinous process of all vertebrae from L5 to C2 (axis)
Segmental branches of posterior rami of spinal nerves.
Both side–Trunk extension.
One side–Trunk lateral flexion to same side.
Trunk rotation to the opposite side.
Rotatores lumborum
O: Transverse processes of lumbar vertebrae.
I: Spinous processes of lumbar vertebrae
Segmental branches of posterior rami of spinal nerves.
Both sides–Trunk extension.
One side–Trunk lateral flexion to same side.
Trunk rotation to the opposite side.
Rotatores thoracis
O: Transverse processes of thoracic vertebrae
I: Spinous processes of thoracic vertebrae.
Segmental branches of posterior rami of spinal nerves.
Both sides–Trunk extension.
One side–Trunk lateral flexion to same side.
Trunk rotation to the opposite side.
Rotatores cervicis
O: Articular processes of cervical vertebrae.
I: Spinous processes of cervical vertebrae.
Segmental branches of posterior rami of spinal nerves.
Both sides–Trunk extension.
One side–Trunk lateral flexion to same side.
Trunk rotation to the opposite side.
Rectus Capitis Posterior Major
O: Spinous process of axis (C2)
I: Lateral portion of occipital bone below inferior nuchal line
Posterior ramus of C1
Extension of head, Rotation of face to same side as muscle
Rectus Capitis Posterior Minor
O: Posterior tubercle of Atlas (C1)
I: Medial portion of occipital bone below inferior nuchal line
Posterior ramus of C1
Extension of head
Obliquus Capitis Superior
O: Transverse process of atlas (C1)
I: Occipital bone between superior and inferior nuchal lines
Posterior ramus of C1
Extension of head and bends it to same side
Obliquus Capitis Inferior
O: Spinous process of axis (C2)
I: Transverse process of atlas (C1)
Posterior ramus of C1
Rotation of face to same side
External Oblique
O: Muscular slips from the outer surfaces of ribs 5 to 12.
I: Lateral lip of iliac crest; aponeurosis ending in midline raphe (linea alba).
Anterior rami of T7 - T12 spinal nerves.
Compress abdominal contents; both muscles flex trunk; each muscle bends trunk to same side, turning anterior part of abdomen to opposite side.
Internal Oblique
O: Thoracolumbar fascia; iliac crest between origins of external and transversus; lateral 2/3 of inguinal ligament.
I: Inferior border of the lower three or four ribs; aponeurosis ending in linea alba; pubic crest and pectineal line.
Anterior rami of T7-T12 spinal nerves.
Compress abdominal contents; both muscles flex trunk; each muscle bends trunk and turns anterior part of abdomen to same side.
Transversus Abdominis
O: Thoracolumbar fascia; medial lip of iliac crest; lateral one-third of iniguinal ligament; costal cortilages of ribs 7 to 12.
I: Aponeurosis ending in linea alba; pubic crest and pectineal line.
Anterior rami of lower spinal nerves T7 to T12 and L1.
Compress abdominal contents.
Rectus Abdominis
O: Pubic crest, pubic tubercle, and pubic symphysis.
I: Costal cartilages of ribs 5 to 7; xiphoid process.
Anterior rami of lower spinal nerves T7 to T12.
Compress abdominal contents; flex vertebral column; tense abdominal wall.
