Spine Flashcards
Sternocleidomastoid
O: sternum, medial 1/3 of clavicle
I: mastoid process of temporal bone
A: both muscles: flexion of head and neck. one muscle: lateral flexion (turns face to opposite side)
N: acessory nerve (motor); spinal nerves C2 and C3 (sensory)
Longus Colli
O: bodies T1-T3; transverse processes and bodies of C3-C5
I: bodies C5-T3, transverse processes C3-C5, anterior surface
A: flexion; possible lateral flexion of neck
N: anterior rami of C2-C6
Anterior Scalene
O: transverse processes of C3-C6
I: superior portion of 1st rib
A: fixation or elevation of first rib during inhalation. with rib fixed: lateral flexion of neck
N: anterior rami of cervical spinal nerves at origin of muscle
Splenius Cervices (right+left)
O: spinous processess of T3-T6
I: transverse processes of C2-C4
A: rotation of head and cervical vertebral column to same side
N: posterior rami of lower cervical nerves
Semispinalis Cervicis
O: transverse processes of upper 5 or 6 thoracic vertebrae
I: spinous process of C2-C5
A: extension of vertebral column
N: posterior rami of cervical and thoracic spinal nerves
Iliocostalis Cervicis
O: angles of upper six ribs
I: transverse process of C4-C6 vertebrae
A: bilateral action: extension of vertebral column. unilateral action: to bend vertebral column toward same side (lateral flexion)
N: posterior rami of spinal nerves in area of muscles
Longissimus Cervicis
O: transverse process of C4-C6 vertebrae
I: transverse process of C2-C6
A: extension of vertebrae column and unilateral flexion
N: posterior rami of spinal nerves
Multifidus
O: sacrum, ilium
I: spinous process of vertebrae above, spanning two to four segments
A: stabalizes, extends, and rotates spine
N: dorsal rami of lumbar region
Levator Scapulae
O: transverse processes of C1-C4
I: superior angle and upper part of medial border of scapula
A: elevation of scapula, rotation of glenoid cavity upward
N: dorsal rami of C3-C4, dorsal scapular nerve
Rectus Abdominis
O: pubic symphysis; pubic crest
I: xiphoid process; costal cartilage 5-7
A: flexes trunk; compresses abdominal viscera
N: ventral rami of six inferior thoracic nerves
Internal Oblique
O: thoracolumbar fascia; anterior 2/3 iliac crest; lateral half of inguinal ligament
I: inferior borders of ribs 10-12; linea alba; pubis
A: compress and support abdominal viscera; unilateral flexion and rotation of trunk
N: ventral rami of six inferior thoracic and first lumbar nerves
External Oblique
O: external surface of ribs 5-12
I: linea alba; pubic tubercle; anterior half of iliac crest
A: flex the trunk; unilateral rotation; compress and support abdominal viscera
N: ventral rami of six inferior thoracic nerves
Quadratus Lumborum
O: medial half of inferior border of 12th rib; tips of lumbar transverse processes
I: iliolumbar ligament; internal lip of iliac crest
A: extends and laterally flexes vertebral column; fixes 12th rib during inspiration
N: ventral rami of T12 and L1-L4
Rotatores
O: transverse processes of lumbar spine
I: lamina and transverse process of spine above, spanning one or two segments
A: stabalizes, extends, and rotates spine
N: dorsal rami of spinal nerves
Longissimus Thoracis
O: intermediate part of common tendon
I: between tubercles and angles of ribs; transverse processes of thoracic
A: extends and laterally bends vertebral column
N: dorsal rami of each region
