Anatomy Trunk and Neck Flashcards
Trapezius
O: occipital bone, ligamentum nuchae, spinous process of C7 and thoracic vertebrae
I: acromion, scapular spine, lateral clavicle
A: stabilizies, raises, retracts, and rotates scapula
N: Accessory Nerve, C3 and C4
Sternocleidomastoid
O: manubrium of sternum and middle clavicle
I: mastoid process of temporal bone
A: flexes and laterally rotates head
N: Accessory Nerve, C1 and C2
Rectus Abdominis
O: pubic crest and symphysis
I: xiphoid process and costal cartilages of ribs 5-7
A: flexes and rotates lumbar region of spine
N: Intercostal Nerves
External Oblique Abdominis
O: outer surfaces of lower 8 ribs
I: linea alba, pubic and iliac crests
A: flexes vertebral column and compresses abdominal wall; rotates trunk and laterally flexes
N: Intercostal Nerves
Internal Oblique Abdominis
O: lumbar fascia, iliac crest, inguinal ligament
I: linea alba, pubic crest, ribs 9-12
A: flexes vertebral column and compresses abdominal wall; rotates trunk and flexes laterally
N: Intercostal Nerves
Transverse Abdominis
O: inguinal ligament, lumbar fascia, iliac crest
I: linea alba, pubic crest
A: compresses abdominal contents
N: Intercostal Nerves
External Intercostals
O: inferior border of rib above
I: superior border of rib below
A: pull ribs toward one another to elevate rib cage
N: Intercostal Nerves
Internal Intercostals
O: superior border of rib below
I: inferior border of rib above (costal groove)
A: draw ribs together and depresses rib cage
N: Intercostal Nerves
Diaphragm
O: inferior, internal surface of rib cage and sternum, costal cartilage, lumbar vertebrae
I: central tendon
A: prime mover of inspiration; flattens on contraction
N: Phrenic Nerves
Iliocostalis
O: iliac crests, ribs 3-12
I: angles of ribs, transverse processes of cervical vertebrae
A: extend and laterally flexes vertebral column
N: Spinal Nerves (dorsal rami)
Longissimus
O: transverse processes of lumbar through cervical vertebrae
I: transverse processes of thoracic or cervical vertebrae and ribs
A: extend and laterally flex vertebral column; extends head and turn face
N: Spinal Nerves (dorsal rami)
Spinalis
O: transverse processes of C7-T12
I: occipital bone and spinous processes of cervical and thoracic vertebrae
A: extends vertebral column
N: Spinal Nerves (dorsal rami)
Quadratus Lumborum
O: iliac crest and lumbar fascia
I: transverse process of lumbar vertebrae and lower 12th rib
A: flexes vertebral column laterally
N: T12 and Upper Lumbar Spinal Nerves (ventral rami)
Scalenes
O: transverse processes of cervical vertebrae
I: anterolaterally on first 2 ribs
A: elevates first 2 ribs
N: Cervical Spine Nerves
