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BIOL 365- Human Anat

Muscles-Origin, Insertion, Action, Inervation

MuscleOriginInsertionActionInervation
External Abdominal Oblique Ext. surface lower 8 ribs Aponeurosis to linea alba, xiphoid process, ant. iliac crest and pubic tubercle (blank) Lower 6 thoracic and upper 2 lumbar
Internal Abdominal Oblique Lateral 2/3 on inguinal ligament, ant. 2/3 of iliac crest, lumbar aponeurosis Lower border of ribs 10-12 with aponeurosis to linea alba, pectineal line of pubis (blank) Lower 6 thoracic and uper 2 lumbar, iliohypogastric and ilioinguinal
Transverse Abdominus Lat. 1/3 of inguinal lig, inner lip of iliac crest, thoracolumbar fascia, cratilages of ribs 7-12 Aponeurosis to linea alba, pectineal line of pubis (blank) Intercostal nerves 7-12, iliohypogastric and ilioinguinal
Rectus Abdominus Pubic tubercle and superior pubic lig. Cartilages of ribs 5-7, xiphoid process Flex vertebral column, posterior tiping of coxals Intercostal nerves 7-12, iliohypogastric and ilioinguinal
Quadratus Lumborum Iliolumbar ligs, posterior iliac crest Lower border of rib 12, tips of transverse processi of first 4 lumbar vertebrae Lat. flexion of vertebral col., depress 12th rib, assist forced expiration Subcostal nerves and lumbar s.n. 1-3
Psoas Major Transverse processi, sides of bodies and intervertebral discs of T12-L5 Lesser trochanter of femur Flexion, lat. rotation of femur. Flex vertebral column when thigh fixed (sit-up) Lumbar s.n. 2 and 3
Iliacus Upper iliac fossa, iliac crest, ant. sacroiliac lig., and base of sacrum Lesser trochanter of femur Flex femur Femoral nerve (L2-L4 s.n.)
Pyramidalis Pubis and superior pubis lig. Linea alba Tenses linea alba Subcostal nerve, s.n. T12
Psoas Minor Vertebral margins of T12 and L1 Pectineal line of pubis Elevates pelvis, minor Lumbar s.n. 1
External Intercostal Inf. border of adjacent sup. rib Superior border of adjacent inf. rib Elevate/fixate intercostal space Intercostal nerves
Internal Intercostal Superior border of adjacent inf. rib Inferior border of adjacent sup. rib Depress/fixate intercostal space Intercostal nerves
Diaphragm Xiphoid process, costal cartilages of ribs 7-12, L1-L3 Central tendon of the diaphragm Respiration Phrenic nerve
Transverse Thoracis Internal surfaces of body of sternum, xiphoid process, costal cartilages of ribs 4-6 Lower border and internal surface of ribs 2-6 Depress ribs 2-6 Upper 6 intercostal nerves
Subcostals Internal surface of rib near angle Superior border of rib 1-3 ribs below Compression Intercostal nerves
Serratus Posterior Superior Ligamentum nuchae, last cervical spine and thoracic spines 1-3 Superior border of ribs 2-5 just past angle Elevate/fixate ribs 2-5 ventral rami of thoracic s.n. 1-3
Serratus Posterior Inferior Last 2 thoracic and first 2 lumbar spines Inferior border of lower ribs 9-12 Depress/fixate ribs 9-12 ventral rami of last four thoracic s.n. 9-12
Levatores Costarum Tips of transverse processi of C7-T11 External surface of rib below Elevate T1-12 Ventral rami of thoracic spinal nerves in the area
Scalenus Anterior Ant. tubercles of trans. processi of C3-C6 Superior surface of 1st rib Elevate 1st rib, lat flexion of C3-C6, rotate C3-C6 Ventral rami, cervical s.n. 5-8
Scalenus Medius Posterior tubercles C2-C7 Superior surface of 1st rib Elevate 1st rib, lat flexion of C2-C7, rotate C2-C7 ventral rami, cervical s.n. 3-4
Scalenus Posterior Posterior tubercles of transverse processi C4-C6 Superior surface of 2nd rib Elevate 2nd rib, lat flexion C4-C6, rotate C4-C6 Ventral rami, cervical s.n. 3-8
Created by: TSUBulldog14