Chapter 12 Trunk and Spinal Column Flashcards
Sternocleidomastoid O&I
Origin: Manubrium of sternum, anterior superior surface of medial clavicle
Insertion: Mastoid process
Sternocleidomastoid Action
extension of head at atlantooccipital joint
flexion of the cervical spine
each side: rotation to contralateral side
each side: lateral flexion to ipsilateral side
Sternocleidomastoid Innervation
Spinal accessory (Cr 11, C2, C3)
Splenius Cervicis O&I
Origin: Spinous processes of the 3rd through 6th thoracic vertebrae
Insertion: Transverse processes of the first three cervical vertebrae
Splenius Cervicis Action
Both sides: exntaesion of the cervical spine
Each side: rotation to ipsilateral side
Each side: lateral flexion to ipsilateral side
Splenius Cervicis Innervation
Posterior lateral branches of cervical nerves four through eight (C4-C8)
Splenius Capitis O&I
Origin: Lower half of the ligament much and the spinous process of the 7th cervical and upper three or four thoracic vertebrae
Insertion: Mastoid process and occipital bone
Splenius Capitis Action
Both sides: extension of the head and cervical spine
Each Side: rotation to ipsilateral side
Each Side: lateral flexion to ipsilateral side
Splenius Capitis Innervation
Posterior lateral branches of cervical nerves four through eight (C4-C8)
Erector Spinae Iliocostalis O&I
Origin: Medial iliac crest, thoracolumbar aponeurosis from sacrum, posterior ribs 3-12
Insertion:Posterior ribs 1-12, cervical 4-7, transverse processes
Erector Spinae Iliocostalis Action
Extension of the spine
Anterior pelvic rotation
Lateral flexion of the spine
Lateral pelvic rotation to contralateral side
Ipsilateral rotation of the spine and head
Erector Spinae Iliocostalis Innervation
Posterior branches of the spinal nerves
Erector Spinae Longissimus O&I
Origin: Medial iliac crest, thoracolumar aponeurosis from sacrum, lumbar 1-5 transverse processes, and thoracic 1-5 transverse processes, cervical 5-7 articular processes
Insertion: Cervical 2-6 spinous processes, thoracic 1-12 transverse processes, lower 9 ribs, mastoid processes
Erector Spinae Longissimus Action
Extension of the spine and head
Anterior pelvic rotation
Lateral flexion of the spine and head
Lateral pelvic rotation to contralateral side
Ipsilateral rotation of the spine and head
Erector Spinae Longissimus Innervation
Posterior branches of the spinal nerves
Erector Spinae Spinalis O&I
Ligamentum nuchae, 7th cervical spinous proces, thoracic 11 and 12 spinous processes, and lumbar 1 and 2 spinous processes
Erector Spinae Spinalis Action
Extension of the spine
Anterior pelvic rotation
Lateral flexion of the spine and head
Lateral pelvic rotation to contralateral side
Ipsilateral rotation of the spine and head
Erector Spinae Spinalis Innervation
Posterior branches of the spinal nerves
Erector Spinae Spinalis Innervation
Posterior branches of the spinal nerves
Quadratus Lumborum O&I
Origin: Posterior inner lip of the iliac crest
Insertion: Approximately one-half the length of the lower border of the 12th rib and the transverse process of the upper four lumbar vertebrae
Quadratus Lumborum Action
Lateral flexion to the ipsilateral side Lateral pelvic rotation to contralateral side Lumbar extension Anterior pelvic rotation Stabilizes the pelvis and lumbar spine
Quadratus Lumborum Innervation
Branches of T12, L1, nerves
Rectus Abdominis O&I
Origin: Crest of pubis
Insertion: Cartilage of 5th, 6th, 7th ribs and xiphoid process
Rectus Abdominis Action
Both sides: lumbar flexion
Both sides: posterior pelvic rotation
Each side: weak lateral flexion to ipsilateral side
Rectus Abdominis Innervation
Intercostal nerves T7-T12
External Oblique Abdominal O&I
Origin: Borders of lower eight ribs at side of chest dovetailing with serrates anterior
Insertion: Anterior had of crest of ilium, inguinal ligament, crest of pubis, and fascia of rectus abdnominis at lower front
External Oblique Abdominal Action
Both sides: lumbar flexion
Both sides: posterior pelvic rotation
Each side: lumbar lateral flexion to ipsilateral side
Each side: Lateral pelvic rotation to contralateral side
Each side: Lumbar rotation to contralateral side
External Oblique Abdominal Innervation
Intercostal nerves (T8-T12), iliohypogastric nerve (T12, L1) and iliioinguinal nerve (L1)
Internal Oblique Abdominal O&I
Origin: Upper half of inguinal ligament, anterior 2/3 of crest of ilium, and lumbar fascia
Insertion: Costal cartilage of 8th, 9th, and 10th ribs and linea alba
Internal Oblique Abdominal Action
Both sides: lumbar flexion
Both sides: posterior pelvic rotation
Each side: lumbar lateral flexion to ipsilateral side
Each side: lateral pelvic rotation to contralateral side
Each side: lumbar rotation to ipsilateral side
Internal Oblique Abdominal Innervation
Intercostal nerves (T8-T12), iliohypogastric nerve (T12, L1) and iliioinguinal nerve (L1)
Transverse Abdominis O&I
Origin: Lateral 1/3 of inguinal ligament, inner rim of iliac crest, inner surface of costal cartilages of lower six ribs, lumbar fascia
Insertion: Crest of the pubis and the iliopectineal line, abdominal aponeurosis to the linea alba
Transverse Abdominis Action
Forced expiration by pulling the abdominal wall inward
Transverse Abdominis Innervation
Intercostal nerves (T7-T12), iliohypogastric nerve (T12, L1) and iliioinguinal nerve (L1)
